Page summary

https://www.proantic.com/

Tested 2026-10-03 01:31:05 using Chrome 152.0.7977.64 (runtime settings)

SummaryWaterfallMetricsRenderingCoachPageXrayCPUThird partyaxe

This page is fast to paint and visually stable, but a little janky to interact with, missing some accessibility basics, loose on best practices and weak on user privacy.

72 / 100
Coach overall
75 / 100
Performance
81 / 100
Best practice
66 / 100
Privacy

How it loaded →

0 → 1.500 s · median run
Frame at 0 ms
start
Frame at 500 ms
Largest paint500 ms
Frame at 800 ms
800 ms
Frame at 1000 ms
1.000 s
Frame at 1300 ms
1.300 s
Frame at 1500 ms
Complete1.500 s
433 ms
First Visual Change
531 ms
Speed Index
500 ms
Visual Complete 85%
1.500 s
Last Visual Change
TTFB77 msLCP488 msTBT246 msCLS0.00
0
Critical violations
2
Serious violations
1
Moderate violation
0
Minor violations

What to act on · top recommendations

Add decoding="async" to non-critical images

0 / 100

The page has 49 images (out of 49) without a decoding hint. Add decoding="async" to non-critical images so the browser can decode them off the main thread.

Avoid using Google Tag Manager.

0 / 100

The page is using Google Tag Manager, this is a performance risk since non-tech users can add JavaScript to your page.

Avoid CPU Long Tasks

0 / 100

The page has 7 CPU long tasks with the total of 616 ms. The total blocking time is 230 ms and 1 long task before first contentful paint with total time of 86 ms. However the CPU Long Task is depending on the computer/phones actual CPU speed, so you should measure this on the same type of the device that your user is using. Use Geckoprofiler for Firefox or Chromes tracelog to debug your long tasks.

Fix accessibility violations

axe-core

axe-core flagged 2 high-impact accessibility violations (0 critical, 2 serious). Open the Accessibility tab to see the offending elements.

Google Web Vitals

min · median · mean · max of 3 runs
MetricMinMedianMeanMaxRuns agree?
Time To First Byte (TTFB)75 ms77 ms82 ms93 msruns disagree ±12%
Largest Contentful Paint (LCP)472 ms488 ms555 ms704 msruns disagree ±24%
Cumulative Layout Shift (CLS)0.00120.00140.00140.0014varies ±7%

Visual Metrics

min · median · mean · max of 3 runs
MetricMinMedianMeanMaxRuns agree?
First visual change433 ms433 ms455 ms500 msvaries ±8%
Last visual change933 ms1.500 s1.311 s1.500 sruns disagree ±19%
Speed index493 ms531 ms527 ms556 msvaries ±6%
Largest image433 ms433 ms455 ms500 msvaries ±8%
Heading466 ms466 ms511 ms600 msruns disagree ±14%
Largest contentful paint500 ms500 ms567 ms700 msruns disagree ±20%
Last meaningful paint500 ms600 ms600 ms700 msruns disagree ±17%
Visual readiness500 ms1.000 s856 ms1.067 sruns disagree ±28%
Visual complete 85500 ms500 ms578 ms733 msruns disagree ±23%
Visual complete 95500 ms500 ms578 ms733 msruns disagree ±23%
Visual complete 99933 ms1.500 s1.311 s1.500 sruns disagree ±19%

CPU

min · median · mean · max of 3 runs
MetricMinMedianMeanMaxRuns agree?
Total Blocking Time230 ms246 ms248 ms269 msvaries ±8%
Max Potential FID155 ms158 ms157 ms158 msstable ±1%
CPU long tasks 7777identical
CPU last long task happens at1.744 s1.967 s1.972 s2.204 sruns disagree ±12%

More metrics

min · median · mean · max of 3 runs
MetricMinMedianMeanMaxRuns agree?
First paint404 ms424 ms429 ms460 msvaries ±7%
Load event end1.865 s2.079 s2.086 s2.313 sruns disagree ±11%

Waterfall

Run 1 SpeedIndex median

First paintFCPLCPDOMContentLoadedDOM interactiveLoadRender-blockingRedirectError

Rendering

Run 1 · median
0.000 s
0s0.5s1s1.5s

The red band on the timeline marks when the main thread was busy with long tasks: moments when the page could not paint or respond, however the video looks.

Download video

Filmstrip

13 frames

Use --filmstrip.showAll to show all filmstrips.

Frame at 0 ms
0 ms
0 %
Frame at 400 ms
400 ms
0 %
Frame at 500 ms
500 ms
96 %
Frame at 600 ms
600 ms
96 %
Frame at 700 ms
700 ms
97 %
Frame at 800 ms
800 ms
97 %
Frame at 900 ms
900 ms
97 %
Frame at 1.000 s
1.000 s
97 %
Frame at 1.100 s
1.100 s
97 %
Frame at 1.200 s
1.200 s
97 %
Frame at 1.300 s
1.300 s
97 %
Frame at 1.400 s
1.400 s
97 %
Frame at 1.500 s
1.500 s
100 %

Click a frame to seek the video to that moment. The dot marks frames where the page changed visually.

Frames

How smoothly Chrome delivered frames to the screen during the test. Dropped counts only frames Chrome flags as affecting smoothness. On mostly-static pages the longest gap includes idle time where there was simply nothing to draw.

Frames shown10
Partial1
Dropped0
Effective FPS8.9
Longest gap877 msat 590 ms

Why was rendering delayed?

Rendering was not meaningfully delayed. First paint landed at 460 ms on a 77 ms first byte; the 8 render-blocking requests were done by 334 ms and the remaining ~126 ms is style and layout work (34 ms of it measured style recalculation).

Style recalculation

measured by Chrome during this run

Style the browser had to recalculate before it could paint: many elements or a lot of time spent here points at expensive CSS on the critical rendering path. The recalculation count and the largest single one tell the two problems apart: one massive style change touching most of the page (few recalculations, the largest close to the total) needs different medicine than thousands of tiny ones (many recalculations, each tiny).

One large recalculation dominates. Restyling 713 elements cost 34 ms before the page painted (7.4 % of the time to First Contentful Paint), and a single recalculation of 709 elements accounts for 34 ms of it. Look for one class or inline-style change on a large container near the top of the DOM that restyles the whole subtree at once. The changes driving it are listed under Style invalidations below.

Before first & largest contentful paint (same paint, 472 ms)

Recalculations3
Elements713
Total time34.234 ms
Largest recalculation709 elements · 33.792 ms

The recalculation work before first paint is 7.4 % of the time to First Contentful Paint.

Render blocking requests

14 requests · 972.3 KB

Blocking requests delay both paints: the browser renders nothing until they arrive, so they push First Contentful Paint and everything after it, including the largest paint (LCP). Requests that block the parser inside the body stall everything after them in the document. Load JavaScript with defer or async, and keep non-critical CSS off the critical path with media attributes. Bars show when each request loaded on a clock that runs to the last paint; the gap after the bars is style and layout work. Web fonts are context, not blockers: text renders invisible or in a fallback face while they load, so a font finishing after a paint is the classic reason text changed late.

RequestWhen it loadedTransferDownload
document
www.proantic.com · TTFB 77 ms
74 ms
26.8 KB73 ms
css · www.youtube.com
308 ms · past LCP
57.4 KB308 ms
css · www.proantic.com
240 ms
40.5 KB240 ms
css · www.proantic.com
55 ms
19.0 KB55 ms
css · www.proantic.com
48 ms
8.9 KB48 ms
css · www.proantic.com
46 ms
517 B46 ms
css · www.proantic.com
43 ms
892 B43 ms
css · www.proantic.com
41 ms
624 B41 ms
css · www.proantic.com
27 ms
1.9 KB27 ms
6 more requests
all done by 1.786 s
842.7 KB
LCP resource
home-section-catchphrase-1e.webp — downloaded by 424 ms, rendered at 472 ms
66 ms
25.5 KB66 ms
web font · www.proantic.com · finished after first paint
996 ms · past LCP
378.5 KB996 ms
web font · www.proantic.com · finished after first paint
95 ms · past LCP
23.0 KB95 ms
web font · www.proantic.com · finished after first paint
89 ms · past LCP
13.7 KB89 ms
0118 ms236 msFCP · LCP 472 ms

Style invalidations

Why the browser had to recalculate style and layout: every DOM/style change invalidates some set of nodes, and the same class or attribute churning over and over is the pattern to hunt. Counts, not milliseconds: the time is in the style recalculation numbers above.

Chase what keeps changing after the page is up. 66 style recalculations and 1 173 layout invalidations fired after first paint, on a page the user was already looking at. The biggest driver is pseudo disabled (7×). Start with the script under "Scripts causing invalidations" that keeps triggering it.

Style recalculations8666 after first paint
Layout invalidations2 1451 173 after first paint

Changes that keep invalidating

top 7
  • pseudo: disabled7×
  • pseudo: enabled7×
  • attribute: disabled4×
  • attribute: aria-hidden1×
  • class: html5-main-video1×
  • class: unstarted-mode1×
  • class: ytp-small-mode1×

Invalidation reasons

split at first paint

Between first and largest paint

Invalidations while the largest paint was still pending, so these delayed it.

ReasonStyle recalculationsLayout
A node was inserted into the page1–

After the largest paint

Churn on the fully rendered page: wasted work and possible jank, but no paint delay.

ReasonStyle recalculationsLayout
A node was inserted into the page30–
A stylesheet rule changed22–
Related style rule9–
JavaScript changed an inline styleSet a class instead of writing element.style, so the browser can batch the work.3–
Frame1–
An element entered layout–111
A web font finished loadingPreload the font or use font-display so a late swap does not re-style the page.–1 038
An element left layout–9
An element's size changed–8
A style change forced layout–6
Scrollbar changed–1

Before first paint: building the page

The page being constructed and styled for the first render. Expected work, shown for scale.

ReasonStyle recalculationsLayout
A node was inserted into the page18–
A stylesheet rule changed2–
An element entered layout–967
An element left layout–3
Scrollbar changed–1
Unknown–1

Coach

The coach helps you find performance problems on your web page using web performance best practice rules. And gives you advice on privacy and best practices. Tested using Coach-core version 9.2.1.

What to fix first

Performance advice

75
13 warnings4 info
infoAdd decoding="async" to non-critical imagesdecodingAsync

The page has 49 images (out of 49) without a decoding hint. Add decoding="async" to non-critical images so the browser can decode them off the main thread.

Setting decoding="async" on an <img> tells the browser it can decode the image off the main thread, which keeps the page responsive to user interactions while images are being processed. The default ("auto") leaves the choice to the browser. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#decoding

Offenders
warn(0)Avoid using Google Tag Manager.googleTagManager

The page is using Google Tag Manager, this is a performance risk since non-tech users can add JavaScript to your page.

Google Tag Manager makes it possible for non tech users to add scripts to your page that will downgrade performance.

warn(0)Avoid CPU Long TaskslongTasks

The page has 7 CPU long tasks with the total of 616 ms. The total blocking time is 230 ms and 1 long task before first contentful paint with total time of 86 ms. However the CPU Long Task is depending on the computer/phones actual CPU speed, so you should measure this on the same type of the device that your user is using. Use Geckoprofiler for Firefox or Chromes tracelog to debug your long tasks.

Long CPU tasks locks the thread. To the user this is commonly visible as a "locked up" page where the browser is unable to respond to user input; this is a major source of bad user experience on the web today. However the CPU Long Task is depending on the computer/phones actual CPU speed, so you should measure this on the same type of the device that your user is using. To debug you should use the Chrome timeline log and drag/drop it into devtools or use Firefox Geckoprofiler.

Offenders
  • self
  • cross-origin-descendant
  • self
  • cross-origin-descendant
  • cross-origin-descendant
  • cross-origin-descendant
  • cross-origin-descendant
warn(0)Total JavaScript size shouldn't be too bigjavascriptSize

The total JavaScript transfer size is 1.1 MB and the uncompressed size is 3.8 MB. This is totally crazy! There is really room for improvement here.

A lot of JavaScript often means you are downloading more than you need. How complex is the page and what can the user do on the page? Do you use multiple JavaScript frameworks?

Offenders
URLTransferContent
https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js30.9 KB87.4 KB
https://www.proantic.com/js/sweetalert2.js15.0 KB47.2 KB
https://analytics.proantic.com/api/script.js33.5 KB33.2 KB
https://www.googletagmanager.com/gtag/js?id=G-YP51KSLLWR164.2 KB485.8 KB
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-hSBuYqsPno.2021...504IQ/m=root,base157.2 KB461.0 KB
https://www.youtube.com/s/player/8ab5c328/player_embed_es6.vflset/en_US/base.js475.0 KB1.6 MB
https://static.doubleclick.net/instream/ad_status.js494 B29 B
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-hSBuYqsPno.2021...73ITEzUA/m=r78Drb221.1 KB914.9 KB
https://www.google.com/js/th/JeUz4nRqeb1gkym__P4turcUd-lzSiN8qMcTTqaOYsw.js24.1 KB62.2 KB
warn(0)Total page size shouldn't be too bigpageSize

The page total transfer size is 3 MB, which is more than the coach limit of 3 MB. That is really big and you need to make it smaller.

Avoid having pages that have a transfer size over the wire of more than 3 MB (desktop) and 2 MB (mobile) because heavy pages hurt performance and are expensive for users on metered connections. Reference: HTTP Archive median page weight in 2024 was around 2.7 MB desktop / 2.4 MB mobile, so this rule fires when a page is above the modern median.

Offenders
URLTransferContent
https://www.proantic.com/26.8 KB133.3 KB
https://www.proantic.com/css/A.googlefonts.css,,q20260926102225+normalize_minify...cf.rEwHvHvTPS.css1.9 KB10.6 KB
https://www.proantic.com/css/A.sweetalert2-v1-2.css,,q20260926102225+carrousel-0...cf.cMgkAqLh5l.css40.5 KB166.5 KB
https://www.proantic.com/css/A.regular.min.css,,q20260926102225+thin.min.css,,q2...cf.tksO1Nqh4Q.css624 B1.2 KB
https://www.proantic.com/css/A.light.min.css,,q20260926102225+duotone-light.min....cf.ymy7TGybnC.css892 B2.8 KB
https://www.proantic.com/css/A.sharp-thin.min.css,q20260926102225.pagespeed.cf.YzYhlV35hF.css517 B401 B
https://www.proantic.com/css/A.proantic.webflow.024.css,q20260926102225.pagespeed.cf.Ais2UatlfR.css8.9 KB39.3 KB
https://www.proantic.com/css/A.main.css,q20260926102225.pagespeed.cf.bINZ46tJHW.css19.0 KB105.7 KB
https://www.proantic.com/ico/logo_proantic_2024.png11.9 KB11.6 KB
https://www.proantic.com/ico/englishflag.png1.5 KB1.1 KB
https://www.proantic.com/ico/33flag20px.jpg1.2 KB869 B
https://www.proantic.com/ico/44flag20px.png2.8 KB2.5 KB
https://www.proantic.com/ico/39flag20px.jpg1.2 KB899 B
https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js30.9 KB87.4 KB
https://www.proantic.com/js/sweetalert2.js15.0 KB47.2 KB
https://analytics.proantic.com/api/script.js33.5 KB33.2 KB
https://www.proantic.com/ico/facebook_sm.png10.4 KB10.1 KB
https://www.proantic.com/ico/INSTAGRAM-LOGO-SM.png67.8 KB67.4 KB
https://www.proantic.com/ico/logo_proantic4a_sm_33.png41.1 KB40.8 KB
https://www.googletagmanager.com/gtag/js?id=G-YP51KSLLWR164.2 KB485.8 KB
https://www.youtube.com/embed/UbDi7Z6y4lA?si=zfBNc_7wTcxutTyn62.8 KB150.8 KB
https://www.youtube.com/s/player/8ab5c328/www-player.css57.4 KB531.9 KB
https://www.youtube.com/s/_/ytembeds/_/ss/k=ytembeds.base.lHvOu8jBwA8.L.W.O/am=A...MDbzg/m=root,base409 B0 b
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-hSBuYqsPno.2021...504IQ/m=root,base157.2 KB461.0 KB
https://www.youtube.com/s/player/8ab5c328/player_embed_es6.vflset/en_US/base.js475.0 KB1.6 MB
https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff239.2 KB39.2 KB
https://www.proantic.com/img/home-section-catchphrase-1e.webp25.5 KB25.2 KB
https://www.proantic.com/img/home-section-catchphrase-2e.webp12.3 KB12.0 KB
https://www.proantic.com/magazine/wp-content/uploads/2026/09/Capture-decran-2026-09-30-093259.png264.4 KB263.9 KB
https://www.proantic.com/magazine/wp-content/uploads/2026/09/Capture-decran-2026-09-30-092536.png254.9 KB254.3 KB
https://www.proantic.com/magazine/wp-content/uploads/2026/09/194342.jpg211.2 KB210.7 KB
https://www.proantic.com/galerie/galleria-de-fusari/img/small/1823901-main-6aad30754f14b.jpg17.0 KB16.7 KB
https://www.proantic.com/galerie/mldantiquites/img/small/1813896-main-6a92f37bdd4ca.jpg22.5 KB22.2 KB
https://www.proantic.com/galerie/serignan/img/small/1121024-main-65b6e2688e963.jpg14.5 KB14.2 KB
https://www.proantic.com/galerie/alain-michel-antiquites/img/small/1810061-main-6a86df92c518e.jpg17.0 KB16.6 KB
https://www.proantic.com/galerie/antichita-castelbarco/img/small/1827352-main-6ab621e580a8d.jpg16.1 KB15.7 KB
https://www.proantic.com/galerie/laurybailly/img/small/1789397-main-6a4a8a6361193.jpg14.3 KB13.9 KB
https://www.proantic.com/galerie/titanfineart/img/small/1818954-main-6aa150372962a.jpg17.6 KB17.3 KB
https://www.proantic.com/galerie/arte-collection/img/small/1826518-main-6ab3e096acc38.jpg20.4 KB20.1 KB
https://www.proantic.com/webfonts/lato-v24-latin-regular.woff223.4 KB23.0 KB
https://www.proantic.com/webfonts/open-sans-v40-latin-regular.woff218.6 KB18.2 KB
https://www.proantic.com/webfonts/fa-thin-100.woff2378.5 KB377.8 KB
https://www.proantic.com/webfonts/lato-v24-latin-300.woff223.0 KB22.7 KB
https://www.proantic.com/webfonts/open-sans-v40-latin-300.woff218.6 KB18.3 KB
https://www.proantic.com/webfonts/open-sans-v40-latin-700.woff218.2 KB17.8 KB
https://www.proantic.com/webfonts/cinzel-v23-latin-regular.woff213.7 KB13.4 KB
https://www.proantic.com/webfonts/open-sans-v40-latin-800.woff218.5 KB18.2 KB
https://www.proantic.com/css/jquery-ui-1_10_3-minify.css5.0 KB24.3 KB
https://analytics.proantic.com/api/site/tracking-config/74be4b2b555a479 B271 B
https://analytics.proantic.com/api/track0 b0 b
https://analytics.proantic.com/api/track222 B16 B
https://googleads.g.doubleclick.net/pagead/idN/A0 b
https://static.doubleclick.net/instream/ad_status.js494 B29 B
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-hSBuYqsPno.2021...73ITEzUA/m=r78Drb221.1 KB914.9 KB
https://googleads.g.doubleclick.net/pagead/id?slf_rd=1146 B100 B
https://www.google.com/js/th/JeUz4nRqeb1gkym__P4turcUd-lzSiN8qMcTTqaOYsw.js24.1 KB62.2 KB
https://i.ytimg.com/vi/UbDi7Z6y4lA/sddefault.jpg...4lA/sddefault.jpg13.6 KB13.1 KB
https://www.proantic.com/ico/proantic_ico_32_1.png3.3 KB3.0 KB
https://www.youtube.com/generate_204?gqAIoQ10 B0 b
https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT0 b0 b
https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT308 B98 B
https://www.youtube.com/youtubei/v1/log_event?alt=json50 B28 B
infoAvoid too many fontsfewFonts

The page has 9 font requests. Do you really need them? What value does the fonts give the user?

How many fonts do you need on a page for the user to get the message? Fonts can slow down the rendering of content, try to avoid loading too many of them because worst case it can make the text invisible until they are loaded (FOIT—flash of invisible text), best case they will flicker the text content when they arrive.

Offenders
warn(24)Serve images in modern formats (AVIF, WebP)modernImageFormats

The page ships 37 images (out of 49) in JPEG/PNG/GIF without a modern alternative. Wrap them in a <picture> with a <source type="image/avif"> or "image/webp" before the legacy <img>, or serve modern formats from your image pipeline directly. AVIF and WebP usually deliver 25–50% smaller files at the same quality.

AVIF and WebP routinely deliver 25–50% smaller files than JPEG and PNG at the same perceived quality, and every browser version still under support understands at least one of them. Ship modern formats either through a <picture> element with <source type="image/avif"> / "image/webp" entries in front of the legacy <img>, or directly from a content-negotiating image pipeline that returns AVIF / WebP when the client accepts it. https://web.dev/articles/serve-images-webp

Offenders
warn(50)Avoid extra requests by setting cache headerscacheHeaders

The page has 5 requests that are missing a cache time. Configure a cache time so the browser doesn't need to download them every time. It will save 64.9 kB the next access.

The easiest way to make your page fast is to avoid doing requests to the server. Setting a cache header on your server response will tell the browser that it doesn't need to download the asset again during the configured cache time! Always try to set a cache time if the content doesn't change for every request.

Offenders
warn(50)Total CSS size shouldn't be too bigcssSize

The total CSS transfer size is 138.2 kB and uncompressed size is 903.7 kB. That is big and the CSS could most probably be smaller.

Delivering a massive amount of CSS to the browser is not the best thing you can do, because it means more work for the browser when parsing the CSS against the HTML and that makes the rendering slower. Try to send only the CSS that is used on that page. And make sure to remove CSS rules when they aren't used anymore.

Offenders
URLTransferContent
https://www.proantic.com/css/A.googlefonts.css,,q20260926102225+normalize_minify...cf.rEwHvHvTPS.css1.9 KB10.6 KB
https://www.proantic.com/css/A.sweetalert2-v1-2.css,,q20260926102225+carrousel-0...cf.cMgkAqLh5l.css40.5 KB166.5 KB
https://www.proantic.com/css/A.regular.min.css,,q20260926102225+thin.min.css,,q2...cf.tksO1Nqh4Q.css624 B1.2 KB
https://www.proantic.com/css/A.light.min.css,,q20260926102225+duotone-light.min....cf.ymy7TGybnC.css892 B2.8 KB
https://www.proantic.com/css/A.sharp-thin.min.css,q20260926102225.pagespeed.cf.YzYhlV35hF.css517 B401 B
https://www.proantic.com/css/A.proantic.webflow.024.css,q20260926102225.pagespeed.cf.Ais2UatlfR.css8.9 KB39.3 KB
https://www.proantic.com/css/A.main.css,q20260926102225.pagespeed.cf.bINZ46tJHW.css19.0 KB105.7 KB
https://www.youtube.com/s/player/8ab5c328/www-player.css57.4 KB531.9 KB
https://www.youtube.com/s/_/ytembeds/_/ss/k=ytembeds.base.lHvOu8jBwA8.L.W.O/am=A...MDbzg/m=root,base409 B0 b
https://www.proantic.com/css/jquery-ui-1_10_3-minify.css5.0 KB24.3 KB
warn(50)Total image size shouldn't be too bigimageSize

The page total image size is 1.1 MB. It's really big. Is the page using the right format for the images? Can they be lazy loaded? Are they compressed as good as they can be? Make them smaller by using https://imageoptim.com/.

Avoid having too many large images on the page. The images will not affect the first paint of the page, but it will eat bandwidth for the user.

warn(59)Avoid slowing down the critical rendering pathavoidRenderBlocking

The page has 9 blocking requests and 4 in body parser blocking (4 JavaScript and 9 CSS). There are 1 potentially render blocking requests. You need to verify if it is render blocking: https://www.googletagmanager.com/gtag/js?id=G-YP51KSLLWR

The critical rendering path is what the browser needs to do to start rendering the page. Every file requested inside of the head element will postpone the rendering of the page, because the browser need to do the request. Avoid loading JavaScript synchronously inside of the head (you should not need JavaScript to render the page), request files from the same domain as the main document (to avoid DNS lookups) and inline CSS for really fast rendering and a short rendering path.

Offenders
infoLong cache headers is goodcacheHeadersLong

The page has 35 requests that have a shorter cache time than one year (but still a cache time).

Setting a cache header is good. Setting a long cache header (a year) is even better because the asset will stay in the browser cache across visits. For content-hashed URLs (e.g. app.4af2.css) you can safely use Cache-Control: max-age=31536000, immutable. For unversioned URLs that may change, use a revalidating strategy instead.

Offenders
infoMake each CSS response smalloptimalCssSize

https://www.proantic.com/css/A.sweetalert2-v1-2.css,,q20260926102225+carrousel-09.css,,q20260926102225+fontawesome.min.css,,q20260926102225,Mcc.-ud7uC62EX.css.pagespeed.cf.cMgkAqLh5l.css size is 41.5 kB (41503) and that is bigger than the limit of 25 kB. https://www.youtube.com/s/player/8ab5c328/www-player.css size is 58.7 kB (58731) and that is bigger than the limit of 25 kB. Try to keep each CSS response under 25 kB.

Render-blocking CSS holds up the first paint until it has fully downloaded, parsed and applied, so smaller CSS files mean a faster start. Split your CSS into a small critical bundle inlined or eagerly loaded, with the rest lazy-loaded.

Offenders
URLTransferContent
https://www.proantic.com/css/A.sweetalert2-v1-2.css,,q20260926102225+carrousel-0...cf.cMgkAqLh5l.css40.5 KB166.5 KB
https://www.youtube.com/s/player/8ab5c328/www-player.css57.4 KB531.9 KB
warn(85)Lazy-load below-the-fold imageslazyLoadingImages

The page has 6 below-the-fold images without loading="lazy". Add loading="lazy" so the browser defers downloading and decoding them until the user scrolls them into view.

Adding loading="lazy" to an <img> tells the browser not to download or decode it until it is close to the viewport. For images that the user may never see (deep in the page, behind a tab, in a footer carousel), this saves bandwidth and main-thread time during initial render. The LCP image and any image in the initial viewport should NOT be lazy-loaded — that delays the first paint. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#loading

Offenders
warn(90)Avoid doing redirectsassetsRedirects

The page has 1 redirect. 1 request are from other domains, it could be 3rd-party assets doing unnecessary redirects. :(

A redirect is one extra step for the user to download the asset. Avoid that if you want to be fast. Redirects are even more of a showstopper on mobile.

Offenders
warn(90)Always compress text contentcompressAssets

The page has 1 request that are served uncompressed. You could save a lot of bytes by sending them compressed instead.

In the early days of the Internet there were browsers that didn't support compressing (gzipping) text content. They do now. Make sure you compress HTML, JSON, JavaScript, CSS and SVG. It will save bytes for the user; making the page load faster and use less bandwith.

Offenders
URLTransferContent
https://analytics.proantic.com/api/script.js33.5 KB33.2 KB
warn(90)Don't use private headers on static contentprivateAssets

The page has 1 request with private headers. Make sure that the assets really should be private and only used by one user. Otherwise, make it cacheable for everyone.

If you set private headers on content, that means that the content are specific for that user. Static content should be able to be cached and used by everyone. Avoid setting the cache header to private.

Offenders

Best practice advice

81
2 warnings3 info
infoAvoid unnecessary headersunnecessaryHeaders

There are 3 responses that sets a p3p header. There are 51 responses that sets both a max-age and expires header. There are 3 responses that sets a pragma no-cache header (that is a request header). There are 61 responses that sets a server header.

Do not send headers that you don't need. We look for p3p, cache-control and max-age, pragma, server and x-frame-options headers. Have a look at Andrew Betts - Headers for Hackers talk as a guide https://www.youtube.com/watch?v=k92ZbrY815c or read https://www.fastly.com/blog/headers-we-dont-want.

Offenders
infoMeta descriptionmetaDescription

The meta description is too long. It has 208 characters, the recommended max is 160

Use a page description to make the page more relevant to search engines.

warn(50)Page titlepageTitle

The title is too long by 10 characters. The recommended max is 60

Use a title to make the page more relevant to search engines.

warn(50)Avoid too many third party requeststhirdParty

The page do 29% requests to third party domains (18 requests and 1.3 MB). First party is 44 requests and 1.8 MB. The regex .*proantic.* was used to calculate first/third party requests.

Do not load most of your content from third party URLs.

infoDo not send too long headerslongHeaders

https://www.proantic.com/ has a header content-security-policy that is 2256 characters long. https://www.youtube....embed/UbDi7Z6y4lA has a header content-security-policy that is 915 characters long. https://www.youtube....embed/UbDi7Z6y4lA has a header set-cookie that is 1328 characters long.

Do not send response headers that are too long.

Offenders

Privacy advice

66
7 warnings5 info
infoSandbox cross-origin iframesiframeSandbox

The page embeds 1 cross-origin iframe without a sandbox attribute. Add sandbox="" with the minimum set of allow-* tokens the embed actually needs.

Adding a sandbox attribute to a cross-origin iframe restricts what the embedded page can do (script execution, form submission, top-level navigation, popups, etc.) and is one of the cheapest ways to limit the blast radius of a third-party embed. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe#sandbox

Offenders
warn(0)Declare a referrer policy on the documentreferrerPolicy

No <meta name="referrer"> tag was found on the page. Set a Referrer-Policy response header (preferred) or add a meta tag, for example <meta name="referrer" content="strict-origin-when-cross-origin">.

Without an explicit referrer policy the browser falls back to the user-agent default and may leak the full URL of the previous page (including query strings) to every cross-origin request. Set a Referrer-Policy response header (preferred) or a <meta name="referrer"> tag in the document. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy

warn(0)Avoid embedding services from surveillance capitalist companiessurveillance

The page embeds 2 resources from companies that profit from user surveillance. Consider privacy-respecting alternatives.

Embedding scripts or iframes from companies whose business model is surveillance capitalism (Google, Facebook, etc.) leaks detailed user data on every page view, often before the user has had a chance to consent. See https://en.wikipedia.org/wiki/Surveillance_capitalism for background. Prefer privacy-respecting alternatives where possible.

Offenders
infoSet a Cross-Origin-Embedder-Policy header so cross-origin subresources opt in to being embedded.crossOriginEmbedderPolicyHeader

Set a Cross-Origin-Embedder-Policy header (typically require-corp or credentialless) on the document response to control cross-origin embedding.

Cross-Origin-Embedder-Policy (COEP) makes the page refuse to load cross-origin subresources unless they explicitly opt in via CORP or CORS. Together with Cross-Origin-Opener-Policy it puts the page in a cross-origin isolated context, which mitigates cross-window side-channel attacks (Spectre) and unlocks high-resolution timers and SharedArrayBuffer. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cross-Origin-Embedder-Policy

Offenders
warn(0)Set a Cross-Origin-Opener-Policy header to isolate the page from cross-origin windows.crossOriginOpenerPolicyHeader

Set a Cross-Origin-Opener-Policy header (typically same-origin) on the document response to isolate the page from cross-origin windows.

Cross-Origin-Opener-Policy (COOP) lets a page sever its window-group ties to cross-origin documents that opened it or that it opens. Together with Cross-Origin-Embedder-Policy it puts the page in a cross-origin isolated context, which mitigates cross-window side-channel attacks (Spectre) and unlocks high-resolution timers and SharedArrayBuffer. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cross-Origin-Opener-Policy

Offenders
infoSet a Cross-Origin-Resource-Policy header to limit who may embed the page.crossOriginResourcePolicyHeader

Set a Cross-Origin-Resource-Policy header (same-origin, same-site or cross-origin) on the document response to limit who may embed it.

Cross-Origin-Resource-Policy (CORP) is a per-response opt-in that tells the browser which origins are allowed to embed the resource. It blocks cross-origin or cross-site no-cors embedding (img, script, iframe, etc.) and is one of the building blocks of cross-origin isolation. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cross-Origin-Resource-Policy

Offenders
infoSet a NEL header so the browser reports network errors back to you.nelHeader

Set a NEL header (paired with Reporting-Endpoints) to collect connection-level error reports from the field.

The NEL (Network Error Logging) response header tells the browser to record connection-level failures (DNS, TLS, HTTP errors) and ship them to a reporting endpoint. NEL pairs with the Reporting-Endpoints / Report-To header — the page declares the endpoint group and NEL points at it. Together they give you visibility into errors that never reach your origin server. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/NEL

Offenders
warn(0)Set a referrer-policy header to make sure you do not leak user information.referrerPolicyHeader

Set a referrer-policy header to make sure you do not leak user information.

Referrer Policy is a new header that allows a site to control how much information the browser includes with navigations away from a document and should be set by all sites. https://scotthelme.co.uk/a-new-security-header-referrer-policy/.

Offenders
infoDeclare reporting endpoints so the browser can deliver Reporting-API events.reportingEndpointsHeader

Set a Reporting-Endpoints header (or the legacy Report-To header) so CSP reports, NEL data and other Reporting-API events have an endpoint to land at.

The Reporting-Endpoints response header (the successor to Report-To) names the URLs that browsers should POST reports to. Without it, CSP report-to directives, Cross-Origin-Opener-Policy reports, NEL data and other Reporting-API events have nowhere to go. The legacy Report-To header is still accepted for older Chromium versions. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Reporting-Endpoints

Offenders
warn(0)Do not share user data with third parties.thirdPartyPrivacy

The page has 29% requests that are 3rd party (18 requests with a size of 1.3 MB). The page also have request to companies that harvest data from users and do not respect users privacy (see https://en.wikipedia.org/wiki/Surveillance_capitalism). The page do 18 surveillance requests and uses 6 surveillance tools. The page do 1 tag-manager request and uses 1 tag-manager tool. The page do 9 video requests and uses 1 video tool. The page do 3 ad requests and uses 1 ad tool. The page do 3 utility requests and uses 1 utility tool.

Using third party requests shares user information with that third party. Please avoid that! The project https://github.com/patrickhulce/third-party-web is used to categorize first/third party requests.

Offenders
warn(30)Use a strict Content-Security-Policy header to mitigate cross-site scripting (XSS) attacks.contentSecurityPolicyHeader

The policy allows 'unsafe-inline', which lets the browser execute inline scripts and styles directly from the page. Move to nonces or hashes plus 'strict-dynamic' so that inline injection cannot run. The policy allows 'unsafe-eval', which lets the page call eval() and Function(). Almost no application needs this; remove it.

A Content-Security-Policy response header tells the browser which sources of script, style, and other content are allowed. The most effective form is a strict CSP using nonces or hashes together with strict-dynamic; the worst is a missing header, with unsafe-inline and unsafe-eval close behind. https://web.dev/articles/strict-csp

warn(90)Avoid third party cookies that is used to track the user.thirdPartyCookies

The page sets 1 third party cookie.

Third party cookies are used to track the user. They are automatically blocked in Safari and Firefox.

Offenders
  • .youtube.com

Page info

A snapshot of what the browser actually built for this page: the document, how big and deep the DOM tree is and what it kept in storage. Big, deep trees are slower to style and lay out, so the counts Chrome warns about carry a flag.

Page info

Document

What the page says it is and how large it rendered.

TitleProantic: Achetez des antiquités et objets d’art présentés par des antThe document title, shown in the browser tab and used by search results.
Layout viewport1358 × 8547 pxThe width the page laid out at, and the full height of the rendered document.

DOM structure

How much markup the browser has to build, style and lay out.

DOM elements753Total HTML elements. Fewer means less for the browser to style, lay out and paint.
Avg DOM depth7How deeply elements are nested on average.
Max DOM depth12The deepest nesting on the page. Deep branches cost more style recalculation.
Iframes1Embedded documents. Each is a separate page the browser loads and renders.
Script tags10Number of script elements. More scripts usually means more main-thread work.

Storage and connection

What the page stored on the client, and the network it was tested on.

Local storage53 BData the page saved in localStorage, kept across visits.
Session storage0 bData kept in sessionStorage for this tab session only.
Connection type4GWhat the Network Information API reported for the test connection.

Resource hints

2 hints
dns-prefetch
  • https://cdn-images.mailchimp.com/
preconnect
  • https://cdn-images.mailchimp.com/

Technologies used to build the page

Data collected using Coach-core version 9.2.1. With updated code from Webappanalyzer 2026-05-04. Use --browsertime.firefox.includeResponseBodies html or --browsertime.chrome.includeResponseBodies html to help Wappalyzer find more information about technologies used.

Detected technologies

3 technologies
  • HSTSConfidence100
    Security
  • Google PageSpeed1.13.35.2Confidence100
    CachingWeb server extensionsPerformance
  • HTTP/3Confidence100
    Miscellaneous

Third-party tools

12 tools

Data collected using Third Party Web version 0.29.2.

Cdn
  • Google CDN
  • Google Fonts
Surveillance
  • Google CDN
  • Google Tag Manager
  • YouTube
  • Google Fonts
  • Google/Doubleclick Ads
  • Other Google APIs/SDKs
Tag-manager
  • Google Tag Manager
Video
  • YouTube
Ad
  • Google/Doubleclick Ads
Utility
  • Other Google APIs/SDKs

Data from run 1

Visual Metrics

Visual milestones

all times from navigation start
Speed Index0.53 show quickly the page looked done
First Visual Change0.50 sfirst paint reaches the screen
Last Visual Change1.50 sscreen stops changing · 1.00 s after first
nothing painted yet
≥95% rendered
First Visual Change · Visual Complete 85% · Visual Complete 95%0.50 s
Visual Complete 99% · Last Visual Change1.50 s
Visual Readiness1.00 s· first to last change
00.3 s0.5 s0.8 s1.0 s1.3 s
Visual progress
Visual progress at 0 s0.0s
Visual progress at 0.5 s0.5s
Visual progress at 0.6 s0.6s
Visual progress at 0.8 s0.8s
Visual progress at 1 s1.0s
Visual progress at 1.2 s1.2s
Visual progress at 1.3 s1.3s
Visual progress at 1.5 s1.5s
FCP0.46s
LCP0.47s
VC850.50s
Long tasks
0.0s0.3s0.6s0.9s1.2s1.5s

Google Web Vitals

from run 1
77 msTTFB
Good
230 msTBT
Needs improvement

Largest Contentful Paint

When the page main content is rendered, collected via the Largest Contentful Paint API. Read more about Largest Contentful Paint.

472 msLCP render time

Phase breakdown

  • TTFB77 ms
  • Resource load delay285 ms
  • Resource load duration66 ms
  • Element render delay44 ms

Element

Element type
<div>
Size (w × h)
173460
URL
https://www.proantic...tchphrase-1e.webp
Load time
436 ms
Style recalculation before LCP
3 recalculations touching 713 elements (34.234 ms) — the largest touched 709 elements (33.792 ms)

DOM path

body > main > section:eq(0) > div:eq(3)
LCP

The LCP element is highlighted in the screenshot. If nothing is highlighted the element was removed before the screenshot or the LCP API couldn't find it.

The Largest Contentful Paint API matched this image:

LCP element

Cumulative Layout Shift

How much the page's content shifts as it loads, collected via the Cumulative Layout Shift API.

0.001cumulative layout shift score

One shift is 66% of your 0.001 CLS. div:eq(3) moved at 574 ms. Reserve space for whatever renders into that spot, a fixed height or an aspect-ratio box, so later content stops pushing the page around.

Elements that shifted

Worst first, showing shifts of 0.01 and up. Each percentage is that shift's exact share of the score.

The shift is spread across many movements below 0.01, none large enough to single out. Check the video or filmstrip to see what moved.

Layout shift

Elements that shifted by more than 0.01 are highlighted in the screenshot. If an element shifted outside the viewport, it won't appear here. Check the video or filmstrip to see the shift.

Browser Metrics

Navigation Timing
Extra timings

Custom metrics collected through JavaScript

There are no custom configured scripts.

Extra metrics collected using scripting

There are no custom extra metrics from scripting.

Visual Elements3
LargestImagelogo_proantic_2024.png
Display time500 ms
Position (x, y)10, 15
Size (w × h)70 × 70
HTML snippet
<img alt="logo-proantic" src="https://www.proantic.com/ico/logo_proantic_2024.png">
LargestImage preview
Heading
Display time600 ms
Position (x, y)37, 202
Size (w × h)500 × 96
HTML snippet
<h1 class="h5-style navbar-big-screen"></h1>
LargestContentfulPaint
Display time500 ms
Position (x, y)535, 192
Size (w × h)420 × 420
HTML snippet
<div class="home-section-catchphrase-image-1 navbar-big-screen" style="background-image:url(https://www.proantic.com/img/home-section-catchphrase-1e.webp)"></div>

PageXray

How the page is built.

HTTP versionHTTP/2.0
Total requests62
Total domains11
Transfer size2.9 MB
Content size6.3 MB
Missing compression1
Cookies11 third-party

Main document

status 200 · 0 redirects

https://www.proantic.com/

HeaderValue
cache-controlmax-age=0, no-cache, s-maxage=10
content-encodinggzip
content-security-policyupgrade-insecure-requests;font-src 'self' data:; img-src 'self' https://assets.pinterest.com/ https://www.googletagmanager.com https://*.googletagmanager.com/ https://*.google-analytics.com/ https://googleads.g.doubleclick.net https://stats.g.doubleclick.net data: blob:; frame-src 'self' https://www.youtube.com https://bid.g.doubleclick.net https://www.google.com/recaptcha/ https://recaptcha.google.com/recaptcha/; child-src 'self' https://www.google.com/recaptcha/ https://recaptcha.google.com/recaptcha/ ;connect-src 'self' https://analytics.proantic.com/ https://storage.googleapis.com/monocle-spdj-production.appspot.com/ wss://gallery-rc.monocle3d.com wss://gallery.monocle3d.com https://gallery-rc.monocle3d.com/ https://components-rc.monocle3d.com/ https://gallery.monocle3d.com/ https://components.monocle3d.com/ https://www.google.com/recaptcha/api2/ https://firebasestorage.googleapis.com https://firestore.googleapis.com https://*.analytics.google.com https://*.googletagmanager.com https://*.google-analytics.com/ https://www.google-analytics.com/j/ www.google-analytics.com *.google-analytics.com https://stats.g.doubleclick.ne blob:; form-action 'self' https://www.sandbox.paypal.com/ https://www.paypal.com/ https://proantic.us8.list-manage.com/subscribe/post; object-src 'none'; worker-src 'self' blob:; base-uri 'self'; frame-ancestors 'self';script-src 'unsafe-eval' 'unsafe-inline' 'self' https://analytics.proantic.com/api/script.js https://components.monocle3d.com/ https://components-rc.monocle3d.com/ https://www.googletagmanager.com/ https://monocle.link https://monocle.link/ https://ajax.googleapis.com/ajax/libs/model-viewer/3.5.0/model-viewer.min.js https://cse.google.com/cse/ https://www.google.com/cse/ https://tagmanager.google.com https://transloadit.edgly.net/releases/ https://code.jquery.com/jquery-3.2.1.min.js https://cdn.jsdelivr.net/npm/ https://apis.google.com/ajax/libs/ https://www.google.com/recaptcha/api.js https://ajax.googleapis.com/ajax/libs/webfont/ https://apis.google.com/js/ https://ajax.googleapis.com/ajax/libs/jquery/ https://ajax.googleapis.com/ajax/libs/jqueryui/ https://www.gstatic.com/recaptcha/ https://cdnjs.cloudflare.com/ajax/libs/jquery/ https://cdnjs.cloudflare.com/ajax/libs/jqueryui/;
content-typetext/html; charset=utf-8
dateSat, 03 Oct 2026 01:31:07 GMT
permissions-policygeolocation=(self), microphone=()
servernginx
strict-transport-securitymax-age=63072000; includeSubDomains; preload
varyAccept-Encoding
x-content-type-optionsnosniff
x-frame-optionsSAMEORIGIN
x-mod-pagespeed1.13.35.2-0

Response codes

200
5995.2%
204
23.2%
302
11.6%

Requests and sizes per content type

8 types

Transfer size2.9 MB

  • javascript37.9%
  • image35.9%
  • font18.6%
  • css4.6%
  • html3.0%
  • json0.04%
  • plain0.00%

Content size6.3 MB

  • javascript57.1%
  • image16.3%
  • css13.7%
  • font8.5%
  • html4.4%
  • json0.01%

Requests61

  • image37.7%
  • css16.4%
  • javascript14.8%
  • font14.8%
  • json8.2%
  • html4.9%
  • other1.6%
  • plain1.6%
ContentHeader SizeTransfer SizeContent SizeRequests
html0 b89.6 KB284.1 KB3
css0 b134.9 KB882.5 KB10
javascript0 b1.1 MB3.6 MB9
image0 b1.0 MB1.0 MB23
font0 b551.6 KB548.6 KB9
json0 b1.2 KB513 B5
other0 b0 b0 b1
plain0 b10 B0 b1
Total0 b2.9 MB6.3 MB61

Data per domain

11 domains
DomainTotal download timeTransfer SizeContent SizeRequests
www.proantic.com6.841 s1.6 MB2.0 MB40
ajax.googleapis.com32 ms30.9 KB87.4 KB1
analytics.proantic.com188 ms34.2 KB33.5 KB4
www.googletagmanager.com928 ms164.2 KB485.8 KB1
www.youtube.com2.531 s973.9 KB3.6 MB8
fonts.gstatic.com132 ms39.2 KB39.2 KB1
googleads.g.doubleclick.net37 ms145 B100 B2
static.doubleclick.net25 ms494 B29 B1
www.google.com22 ms24.1 KB62.2 KB1
i.ytimg.com5 ms13.6 KB13.1 KB1
jnn-pa.googleapis.com43 ms308 B98 B2

Expires & last-modified statistics

typeminmedianmax
Expires0 seconds4 weeks1 year
Last modified3 hours7 days17 years

Requests loaded after onLoad event

5 requests

Includes requests done after load event end.

ContentTransfer SizeRequests
html0 b1
css0 b0
javascript0 b0
image3.3 KB1
font0 b0
favicon0 b0
plain10 B1
json358 B2
Total3.6 KB5

Requests loaded after onContentLoad

14 requests

Includes requests done after DOM content loaded.

ContentTransfer SizeRequests
html0 b1
css0 b0
javascript245.7 KB3
image16.8 KB2
font0 b0
favicon0 b0
json1.2 KB5
other0 b1
plain10 B1
Total263.8 KB14

CPU

Long tasks

Tasks ≥ 50 ms blocking the main thread, collected via the Long Task API.

TBT230 ms
Max potential input delay158 ms
Total long tasks7
Total time616 ms
Last task at2.204 s
Before first paint86 ms1 task
Before FCP86 ms1 task
Before LCP86 ms1 task
After load0 ms0 tasks

Long Animation Frames

A long animation frame (LOAF) is a frame that took ≥ 50 ms from input to the next paint. The part beyond the threshold is blocking time, the number that hurts Interaction to Next Paint and Total Blocking Time. Break long tasks up (scheduler.yield(), smaller chunks) or move the work off the main thread. Read more about the Long Animation Frames API.

Long animation frames6every frame ≥ 50 ms
Blocking time175.5 msacross all long frames — what hurts INP and TBT
Blocking before LCP40.8 msdelaying the largest paint — fix these first

What to fix first

ScriptFramesTime runningBlocking (share by run time)Forced style & layoutTriggered by
js3rd party165.1 ms15.3 ms–script tag

A frame's blocking time is split between its scripts by their share of the frame's work, capped at each script's own run time — blocking from work no script owns (HTML parsing, browser internals) stays unattributed. The per-script blocking view below uses the same attribution.

Long animation frame #1 · 100.1 msat 2.104 s · before load
blocking 47.5 ms
  • Scripts & other work96.8 ms
  • Animation callbacks0 ms
  • Style & layout3.3 ms
  • Render0 ms

The browser did not report which script was responsible for this frame — typically its own style/layout work, or a cross-origin script it will not name.

Long animation frame #2 · 329.1 msat 96 ms · before LCP
blocking 40.8 ms
  • Scripts & other work250.3 ms
  • Animation callbacks0 ms
  • Style & layout78.8 ms
  • Render0 ms

The browser did not report which script was responsible for this frame — typically its own style/layout work, or a cross-origin script it will not name.

Long animation frame #3 · 99 msat 1.996 s · before load
blocking 35.2 ms
  • Scripts & other work93.2 ms
  • Animation callbacks0 ms
  • Style & layout5.8 ms
  • Render0 ms

The browser did not report which script was responsible for this frame — typically its own style/layout work, or a cross-origin script it will not name.

Long animation frame #4 · 104.3 msat 2.204 s · before load
blocking 28.4 ms
  • Scripts & other work101.9 ms
  • Animation callbacks2.3 ms
  • Style & layout0.1 ms
  • Render0 ms

The browser did not report which script was responsible for this frame — typically its own style/layout work, or a cross-origin script it will not name.

Long animation frame #5 · 65.3 msat 1.046 s · before load
blocking 15.3 ms
  • Scripts & other work65.3 ms
  • Animation callbacks0 ms
  • Style & layout0 ms
  • Render0 ms
1 script ran during this frame
js3rd party
Ran for
65.1 ms
How it started
script tag
Long animation frame #6 · 58.9 msat 664.5 ms · before load
blocking 8.3 ms
  • Scripts & other work58.8 ms
  • Animation callbacks0.1 ms
  • Style & layout0 ms
  • Render0 ms

The browser did not report which script was responsible for this frame — typically its own style/layout work, or a cross-origin script it will not name.

Blocking time per script (browser-reported)

How much each script blocked the main thread, derived from the Long Animation Frame API. Each frame's blocking time is split between its scripts by their share of the frame's work, capped at each script's own run time — blocking from work no script owns (HTML parsing, browser internals) is not attributed (older data credits the script that started the frame). The closest answer to "which script should I fix to improve TBT" the platform exposes.

Top scripts blocking the main thread

1 of 1 script

Blocking time per script (trace)

Total Blocking Time attributed per script from the Chrome trace: every main-thread task longer than 50 ms blocks input for the remainder, and each blocking task is credited to the script whose own code ran the longest during that task.

TBT269.2 ms
Blocking tasks7
TBT before LCP37.9 ms1 task

What kind of work blocked

mostly running javascript · 269 ms total
Running JavaScript225.6 ms83.8%
Style & layout37.4 ms13.9%
Paint & composite2.8 ms1.0%
Other browser work2.2 ms0.8%
Garbage collection1.2 ms0.4%
Parsing & compiling JavaScript0.1 ms0.0%
Running JavaScript (84%): the scripts responsible are listed right below. See Timers
Style & layout (14%): usually a large DOM, expensive CSS selectors or JavaScript forcing synchronous layout. See Forced reflows · Style invalidations (Rendering tab)

Where the time went

All main-thread work during the full page load, not just the share that blocked input. Calculated from the Chrome trace.

Categories

1.263 s total
Running JavaScript852 ms67.5%
Other browser work (scheduling)150 ms11.9%
Style & layout138 ms10.9%
Parsing HTML & CSS69 ms5.5%
Paint & composite31 ms2.5%
Garbage collection15 ms1.2%
Parsing & compiling JavaScript8 ms0.6%
What do these categories mean?
Parsing HTML & CSSparseHTML
Reading the HTML and CSS and building the page structure. Grows with document size — a big server-rendered page costs more here.
Style & layoutstyleLayout
Working out which CSS rules apply and where every element goes on the page. Grows with DOM size and selector complexity.
Parsing & compiling JavaScriptscriptParseCompile
Parsing and compiling JavaScript before it can run — the cost of shipping bytes of JS, even unused ones.
Running JavaScriptscriptEvaluation
Running JavaScript: event handlers, timers, promise callbacks and script execution.
Paint & compositepaintCompositeRender
Painting pixels and assembling layers into the frames you see on screen.
Garbage collectiongarbageCollection
Reclaiming memory JavaScript no longer uses. A lot of it means allocation-heavy code.
Other browser work (scheduling)other
Chrome’s own task management: per-task overhead and thousands of sub-millisecond scheduler ticks — not page work you can attribute or optimize away. On this page 148 ms of it is this per-task bookkeeping (RunTask self time in the trace).

CPU time per script

Timers

How much setTimeout/setInterval work the page runs, credited to the script that scheduled each timer. Many zero-delay timers mean work sliced into a machine-gun of tiny tasks; repeating timers are polling.

Timers set116
Times fired427
Fire time269.4 ms
Zero-delay timers33
Repeating timers2
Polling: Bn in https://www.youtube.com/s/player/8ab5c328/player_embed_es6.vflset/en_US/base.js keeps a 25 ms timer running: it fired 344 times costing 32 ms. Consider reacting to events instead, or a longer interval.
Zero-delay slicing: od in https://www.googletagmanager.com/gtag/js?id=G-YP51KSLLWR split work into 22 back-to-back tasks costing 24 ms. Consider batching the work or moving it to requestIdleCallback or a worker.

Timer cost by script

7 scripts

Forced reflows

A forced reflow happens when JavaScript reads a layout-triggering property (offsetTop, getBoundingClientRect, …) inside a handler, forcing the browser to synchronously recompute layout. The scripts below caused most of the page's reflows. Fix them in priority order.

Scripts causing reflows

3 reflows ≥ 2 ms across 2 scripts
Inline or unnamed script
2 ms · 1 reflow · worst 2 ms

First vs third party CPU time

Main-thread CPU time from the Chrome trace split by domain. First party is proantic.com.

First party13 ms
Third party695 ms
Domains4

CPU time per domain/tool

Domain / tool breakdown

3 entities
YouTube
800.8 ms
Google Tag Manager
90.6 ms
Google CDN
24.9 ms

Want to dig deeper? Download the Chrome trace and drag-and-drop it into Performance in DevTools.

Third party

Third party requests categorised by Third party web version 0.29.2.

Third-party requests36
Tools6
Categories6
Third-party cookies1

Categories

6 categories

Requests by category36

  • survelliance18 req · 6 tools50.0%
  • video9 req · 1 tool25.0%
  • ad3 req · 1 tool8.3%
  • utility3 req · 1 tool8.3%
  • cdn2 req · 2 tools5.6%
  • tag-manager1 req · 1 tool2.8%

Third party requests and tools

6 categories
cdnGoogle CDNGoogle Fonts2 requests · 2 tools
survellianceGoogle CDNGoogle Tag ManagerYouTube+ 3 more18 requests · 6 tools
tag-managerGoogle Tag Manager1 requests · 1 tool
videoYouTube9 requests · 1 tool
adGoogle/Doubleclick Ads3 requests · 1 tool
utilityOther Google APIs/SDKs3 requests · 1 tool
Third party cookies1
.youtube.com1 cookie

First party vs third party

44 first · 18 third party

Transfer size2.9 MB

  • First party1.7 MB57.9%
  • Third party1.2 MB42.1%

Content size6.3 MB

  • First party2.1 MB32.7%
  • Third party4.2 MB67.3%

Requests62

  • First party4471.0%
  • Third party1829.0%

First party requests and sizes per content type

44 requests

Calculated using .*proantic.* (use --firstParty to configure).

ContentHeader SizeTransfer SizeContent SizeRequests
html0 b26.8 KB133.3 KB1
css0 b77.2 KB350.7 KB8
javascript0 b48.5 KB80.4 KB2
image0 b1.0 MB1.0 MB22
font0 b512.4 KB509.4 KB8
favicon0 b0 b0 b0
json0 b701 B287 B2
other0 b0 b0 b1
TotalN/A1.7 MB2.1 MB44

Third party requests and sizes per content type

18 requests
ContentHeader SizeTransfer SizeContent SizeRequests
html0 b62.8 KB150.8 KB2
css0 b57.8 KB531.9 KB2
javascript0 b1.0 MB3.5 MB7
image0 b13.6 KB13.1 KB1
font0 b39.2 KB39.2 KB1
favicon0 b0 b0 b0
json0 b504 B226 B3
plain0 b10 B0 b1
TotalN/A1.2 MB4.2 MB18

Axe

Axe is an accessibility testing engine for websites and other HTML-based user interfaces. Tested using axe-core version 4.11.4. Read more about axe-core.

This page has accessibility issues to fix.

Worst impact across the runs: serious. Open an individual run to see the actual violations.

Violations

median across runs
Critical00 issues
Serious29 issues
Moderate11 issue
Minor00 issues