Page summary

https://stf.xelta.ai/ai-studio/xelta-prism/playground

Tested 2026-07-31 12:59:20 using Chrome 150.0.7871.186 (runtime settings)

SummaryWaterfallMetricsRenderingCoachPageXrayCPUThird party

This page is fast to paint, visually stable and follows best practices, but janky to interact with, weak on user privacy and heavy to download.

72 / 100
Coach overall
76 / 100
Performance
91 / 100
Best practice
60 / 100
Privacy

How it loaded →

0 → 6.050 s · median run
Frame at 0 ms
start
Frame at 1400 ms
Largest paint1.400 s
Frame at 2700 ms
2.700 s
Frame at 3800 ms
3.800 s
Frame at 5000 ms
5.000 s
Frame at 6100 ms
Complete6.100 s
334 ms
First Visual Change
1.200 s
Speed Index
1.270 s
Visual Complete 85%
6.050 s
Last Visual Change
TTFB137 msLCP1.268 sTBT771 msCLS0.00

What to act on · top recommendations

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 11 CPU long tasks with the total of 1.717 s. The total blocking time is 771 ms and 2 long tasks before first contentful paint with total time of 496 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.

Avoid extra requests by setting cache headers

0 / 100

The page has 12 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 23.8 kB the next access.

Google Web Vitals

min · median · mean · max of 1 run
MetricMinMedianMeanMax
Time To First Byte (TTFB)137 ms137 ms137 ms137 ms
Largest Contentful Paint (LCP)1.268 s1.268 s1.268 s1.268 s
Cumulative Layout Shift (CLS)0000

Visual Metrics

min · median · mean · max of 1 run
MetricMinMedianMeanMax
First visual change334 ms334 ms334 ms334 ms
Last visual change6.050 s6.050 s6.050 s6.050 s
Speed index1.200 s1.200 s1.200 s1.200 s
Visual readiness5.716 s5.716 s5.716 s5.716 s
Visual complete 851.270 s1.270 s1.270 s1.270 s
Visual complete 953.777 s3.777 s3.777 s3.777 s
Visual complete 993.777 s3.777 s3.777 s3.777 s

CPU

min · median · mean · max of 1 run
MetricMinMedianMeanMax
Total Blocking Time771 ms771 ms771 ms771 ms
Max Potential FID264 ms264 ms264 ms264 ms
CPU long tasks 11111111
CPU last long task happens at8.423 s8.423 s8.423 s8.423 s

More metrics

min · median · mean · max of 1 run
MetricMinMedianMeanMax
First paint1.268 s1.268 s1.268 s1.268 s
Load event end560 ms560 ms560 ms560 ms

Waterfall

Run 1 SpeedIndex median

First paintFCPLCPDOMContentLoadedDOM interactiveLoadRender-blockingRedirectError

Rendering

Run 1 · median
0.000 s
0s2s4s6s

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

58 frames

Use --filmstrip.showAll to show all filmstrips.

Frame at 0 ms
0 ms
0 %
Frame at 400 ms
400 ms
34 %
Frame at 500 ms
500 ms
34 %
Frame at 600 ms
600 ms
34 %
Frame at 700 ms
700 ms
34 %
Frame at 800 ms
800 ms
34 %
Frame at 900 ms
900 ms
34 %
Frame at 1.000 s
1.000 s
34 %
Frame at 1.100 s
1.100 s
34 %
Frame at 1.200 s
1.200 s
34 %
Frame at 1.300 s
1.300 s
91 %
Frame at 1.400 s
1.400 s
91 %
Frame at 1.500 s
1.500 s
91 %
Frame at 1.700 s
1.700 s
91 %
Frame at 1.800 s
1.800 s
91 %
Frame at 1.900 s
1.900 s
91 %
Frame at 2.000 s
2.000 s
91 %
Frame at 2.100 s
2.100 s
91 %
Frame at 2.200 s
2.200 s
91 %
Frame at 2.300 s
2.300 s
91 %
Frame at 2.400 s
2.400 s
91 %
Frame at 2.500 s
2.500 s
91 %
Frame at 2.600 s
2.600 s
91 %
Frame at 2.700 s
2.700 s
91 %
Frame at 2.800 s
2.800 s
91 %
Frame at 2.900 s
2.900 s
91 %
Frame at 3.000 s
3.000 s
91 %
Frame at 3.100 s
3.100 s
91 %
Frame at 3.200 s
3.200 s
91 %
Frame at 3.300 s
3.300 s
91 %
Frame at 3.400 s
3.400 s
91 %
Frame at 3.500 s
3.500 s
91 %
Frame at 3.600 s
3.600 s
91 %
Frame at 3.700 s
3.700 s
91 %
Frame at 3.800 s
3.800 s
99 %
Frame at 3.900 s
3.900 s
99 %
Frame at 4.000 s
4.000 s
99 %
Frame at 4.100 s
4.100 s
99 %
Frame at 4.200 s
4.200 s
99 %
Frame at 4.300 s
4.300 s
99 %
Frame at 4.400 s
4.400 s
99 %
Frame at 4.500 s
4.500 s
99 %
Frame at 4.600 s
4.600 s
99 %
Frame at 4.700 s
4.700 s
99 %
Frame at 4.800 s
4.800 s
99 %
Frame at 4.900 s
4.900 s
99 %
Frame at 5.000 s
5.000 s
99 %
Frame at 5.100 s
5.100 s
99 %
Frame at 5.200 s
5.200 s
99 %
Frame at 5.300 s
5.300 s
99 %
Frame at 5.400 s
5.400 s
99 %
Frame at 5.500 s
5.500 s
99 %
Frame at 5.600 s
5.600 s
99 %
Frame at 5.700 s
5.700 s
99 %
Frame at 5.800 s
5.800 s
99 %
Frame at 5.900 s
5.900 s
99 %
Frame at 6.000 s
6.000 s
99 %
Frame at 6.100 s
6.100 s
100 %

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

Why was rendering delayed?

Rendering was not meaningfully delayed. First paint landed at 1.268 s on a 137 ms first byte; the 2 render-blocking requests were done by 247 ms and the remaining ~1.021 s is style and layout work.

Want to see how much CSS style-recalculation work delayed FCP and LCP, plus CPU long tasks? Run with --cpu.

Render blocking requests

2 requests · 74.6 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
stf.xelta.ai · TTFB 137 ms
129 ms
17.7 KB125 ms
css · stf.xelta.ai
70 ms
73.2 KB70 ms
css · stf.xelta.ai
38 ms
1.4 KB38 ms
web font · stf.xelta.ai
80 ms
48.0 KB80 ms
web font · stf.xelta.ai · finished after first paint
loaded after FCP, at 3.739 s
83.7 KB16 ms
0317 ms634 msFCP · LCP 1.268 s

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.

Performance advice

76
2 errors10 warnings4 info
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 11 CPU long tasks with the total of 1.717 s. The total blocking time is 771 ms and 2 long tasks before first contentful paint with total time of 496 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
  • multiple-contexts
  • self
  • self
  • same-origin-descendant
  • same-origin-descendant
  • self
  • self
  • self
  • self
  • self
  • self
warn(0)Avoid extra requests by setting cache headerscacheHeaders

The page has 12 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 23.8 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(0)Total JavaScript size shouldn't be too bigjavascriptSize

The total JavaScript transfer size is 1.2 MB and the uncompressed size is 4.1 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://www.googletagmanager.com/gtag/js?id=G-CPG3NLBKHP180.8 KB548.3 KB
https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e178179150949611.3 KB30.9 KB
https://stf.xelta.ai/_next/static/chunks/0_ivozyvwwju-.js5.4 KB16.6 KB
https://stf.xelta.ai/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js4.6 KB12.0 KB
https://stf.xelta.ai/_next/static/chunks/0q0f-q-esowzk.js78.7 KB307.9 KB
https://stf.xelta.ai/_next/static/chunks/0wc5chl2qfyvw.js4.2 KB71.6 KB
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https://stf.xelta.ai/cdn-cgi/challenge-platform/h/g/scripts/jsd/f70cb37711aa/main.js?9.7 KB20.6 KB
https://connect.facebook.net/en_US/fbevents.js103.8 KB394.5 KB
https://stf.xelta.ai/_next/static/chunks/0w-tb20otfze_.js80.1 KB264.5 KB
https://stf.xelta.ai/_next/static/chunks/0a41ov9xoezkw.js2.8 KB6.2 KB
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https://stf.xelta.ai/_next/static/chunks/0n.g2w7wguhv3.js9.3 KB28.3 KB
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https://stf.xelta.ai/_next/static/chunks/0oxjj2cw4l~r1.js3.7 KB7.2 KB
https://connect.facebook.net/signals/config/1941936199799107.../194193619979910761.2 KB262.7 KB
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warn(0)Total page size shouldn't be too bigpageSize

The page total transfer size is 4.3 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://stf.xelta.ai/ai-studio/xelta-prism/playground17.7 KB116.3 KB
https://stf.xelta.ai/cdn-cgi/speculation691 B151 B
https://stf.xelta.ai/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff248.0 KB47.3 KB
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https://stf.xelta.ai/_next/image?url=%2Ficons%2Flogo1.png&w=32&q=751.6 KB924 B
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https://stf.xelta.ai/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js4.6 KB12.0 KB
https://stf.xelta.ai/manifest.json1.1 KB1.2 KB
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https://telemetry.matchbestsoftware.online/faro/286 B2 B
https://stf.xelta.ai/_next/static/chunks/0ltjyj-xdme9k.js14.5 KB42.1 KB
https://stf.xelta.ai/_next/static/chunks/0t~dpv9j7jqud.js46.6 KB207.4 KB
https://stf.xelta.ai/_next/image?url=%2Fchatboard%2Favtar.png&w=96&q=755.9 KB5.9 KB
https://stf.xelta.ai/_next/image?url=%2Fchatboard%2Favtar.png&w=96&q=755.9 KB5.9 KB
https://www.google-analytics.com/g/collect...ics.com/g/collect57 B0 b
https://analytics.google.com/g/collect...gle.com/g/collect57 B0 b
https://telemetry.matchbestsoftware.online/faro/286 B2 B
https://telemetry.matchbestsoftware.online/faro/286 B2 B
error(20)Avoid missing and error requestsresponseOk
warn(50)Total CSS size shouldn't be too bigcssSize

The total CSS transfer size is 76.4 kB and uncompressed size is 570.2 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://stf.xelta.ai/_next/static/chunks/0bn2cukj3v_dz.css73.2 KB554.9 KB
https://stf.xelta.ai/_next/static/chunks/08ak-dq81l91~.css1.4 KB2.0 KB
infoThe favicon should be small and cacheablefavicon

The favicon size is 664.4 kB bytes. That's quite big, can you make it smaller?

It is easy to make the favicon big but please avoid doing that, because every browser will then perform an unnecessarily large download. And make sure the cache headers are set for a long time for the favicon. It is easy to miss since it's another content type.

Offenders
warn(50)Total image size shouldn't be too bigimageSize

The page total image size is 2.2 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.

infoAvoid too many fontsfewFonts

The page has 2 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
infoLong cache headers is goodcacheHeadersLong

The page has 19 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
warn(90)Avoid doing redirectsassetsRedirects

The page has 1 redirect. 1 of the redirects are from the base domain, please fix them!

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://stf.xelta.ai/cdn-cgi/challenge-platform/h/g/scripts/jsd/f70cb37711aa/main.js?9.7 KB20.6 KB
infoMake each CSS response smalloptimalCssSize

https://stf.xelta.ai/_next/static/chunks/0bn2cukj3v_dz.css size is 75 kB (74952) 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://stf.xelta.ai/_next/static/chunks/0bn2cukj3v_dz.css73.2 KB554.9 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
error(97)Avoid using incorrect mime typesmimeTypes

The page has 3 misconfigured mime types.

It's not a great idea to let browsers guess content types (content sniffing), in some cases it can actually be a security risk.

Offenders

Best practice advice

91
1 warning2 info
infoAvoid unnecessary headersunnecessaryHeaders

There are 1 response that sets a p3p header. There are 3 responses that sets both a max-age and expires header. There are 6 responses that sets a pragma no-cache header (that is a request header). There are 96 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
warn(50)Avoid too many third party requeststhirdParty

The page do 22% requests to third party domains (22 requests and 369.3 kB). First party is 76 requests and 4 MB. The regex .*xelta.* 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://stf.xelta.ai/cdn-cgi/rum? has a header report-to that is 619 characters long. https://stf.xelta.ai.../a23cc7a379140522 has a header cf-chl-out-s that is 1713 characters long. https://stf.xelta.ai.../a23cc7a379140522 has a header cf-chl-out-s that is 1713 characters long. https://connect.face...en_US/fbevents.js has a header content-security-policy that is 1344 characters long. https://connect.face...en_US/fbevents.js has a header content-security-policy-report-only that is 1415 characters long. https://connect.face...en_US/fbevents.js has a header permissions-policy that is 874 characters long. https://connect.face.../1941936199799107 has a header content-security-policy that is 1344 characters long. https://connect.face.../1941936199799107 has a header content-security-policy-report-only that is 1415 characters long. https://connect.face.../1941936199799107 has a header permissions-policy that is 874 characters long.

Do not send response headers that are too long.

Offenders

Privacy advice

60
1 error6 warnings2 info
warn(0)Avoid using Google Analyticsga

The page is using Google Analytics meaning you share your users private information with Google. You should use analytics that care about user privacy, something like https://matomo.org.

Google Analytics share private user information with Google that your user hasn't agreed on sharing.

warn(0)Avoid embedding services from surveillance capitalist companiessurveillance

The page embeds 3 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
warn(0)Use a strict Content-Security-Policy header to mitigate cross-site scripting (XSS) attacks.contentSecurityPolicyHeader

Set a Content-Security-Policy header to mitigate cross-site scripting attacks. You can start with a Content-Security-Policy-Report-Only header, which only reports violations rather than blocking them.

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

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
error(0)Serve all responses on HTTPS (when you are on HTTPS)mixedContent

You need to serve all responses on HTTPS. The page have 2 responses using HTTP. That is a privacy and security risk.

You need to make sure that if you are on HTTPS, all responses are on HTTPS so that the content served are secured.

Offenders
warn(0)Set a Permissions-Policy header to control which browser features the page can use.permissionsPolicyHeader

Set a Permissions-Policy header to control which browser features the page can use.

The Permissions-Policy response header (the successor to Feature-Policy) lets a site explicitly opt in or out of powerful browser features such as camera, microphone, geolocation, payment and clipboard. Setting a strict policy reduces the attack surface and limits what embedded third parties can do. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Permissions-Policy

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

The page has 10% requests that are 3rd party (10 requests with a size of 366.5 kB). 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 1 tag-manager request and uses 1 tag-manager tool. The page do 9 survelliance requests and uses 5 survelliance tools. The page do 9 surveillance requests and uses 5 surveillance tools. The page do 2 utility requests and uses 2 utility tools. The page do 2 social requests and uses 1 social tool. The page do 4 analytics requests and uses 1 analytics tool. The page do 1 ad request and uses 1 ad 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

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.

TitleXelta Prism - One Video, Infinite Formats | XeltaThe document title, shown in the browser tab and used by search results.
Layout viewport1365 × 620 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 elements546Total HTML elements. Fewer means less for the browser to style, lay out and paint.
Avg DOM depth10How deeply elements are nested on average.
Max DOM depth16The deepest nesting on the page. Deep branches cost more style recalculation.
Iframes1Embedded documents. Each is a separate page the browser loads and renders.
Script tags74Number 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 storage871 BData the page saved in localStorage, kept across visits.
Session storage267 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://media.xelta.ai/
preconnect
  • https://media.xelta.ai/

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

8 technologies
  • Node.jsConfidence100
    Programming languages
  • UbuntuConfidence100
    Operating systems
  • EnvoyConfidence100
    Reverse proxies
  • Nginx1.24.0Confidence100
    Web serversReverse proxies
  • ExpressConfidence100
    Web frameworksWeb servers
  • HSTSConfidence100
    Security
  • CloudflareConfidence100
    CDN
  • HTTP/3Confidence100
    Miscellaneous

Third-party tools

16 tools

Data collected using Third Party Web version 0.29.2.

Tag-manager
  • Google Tag Manager
Survelliance
  • Google Tag Manager
  • Facebook
  • Google Analytics
  • Google/Doubleclick Ads
  • Other Google APIs/SDKs
Surveillance
  • Google Tag Manager
  • Facebook
  • Google Analytics
  • Google/Doubleclick Ads
  • Other Google APIs/SDKs
Utility
  • Cloudflare
  • Other Google APIs/SDKs
Social
  • Facebook
Analytics
  • Google Analytics
Ad
  • Google/Doubleclick Ads

Data from run 1

Visual Metrics

Visual milestones

all times from navigation start
Speed Index1.20 show quickly the page looked done
First Visual Change0.33 sfirst paint reaches the screen
Last Visual Change6.05 sscreen stops changing · 5.72 s after first
≥85%
≥99%
0.33 sFirst Visual Change
1.27 sVisual Complete 85%
3.78 sVisual Complete 95% · Visual Complete 99%
Last Visual Change6.05 s
Visual Readiness5.72 s· first to last change
02.0 s4.0 s
Content milestones
Perception index
Visual progress
Visual progress at 0 s0.0s
Visual progress at 1.1 s1.1s
Visual progress at 2 s2.0s
Visual progress at 2.8 s2.8s
Visual progress at 3.7 s3.7s
Visual progress at 4.5 s4.5s
Visual progress at 5.3 s5.3s
Visual progress at 6.1 s6.1s
FCP1.27s
LCP1.27s
VC851.27s
Long tasks
0.0s1.2s2.4s3.7s4.9s6.1s

Google Web Vitals

from run 1

Largest Contentful Paint

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

1.268 sLCP render time

Phase breakdown

  • TTFB137 ms
  • Resource load delay0 ms
  • Resource load duration0 ms
  • Element render delay1.131 s

Element

Element type
<h1>
Size (w × h)
34250
Load time
0 ms

DOM path

body > div#app-root > div:eq(1) > main > div > div:eq(1) > div > h1
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.

Cumulative Layout Shift

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

0.000cumulative layout shift score

No layout shifts were detected on this page.

Browser Metrics

Navigation Timing
Extra timings

Server timings

Timing data the server chose to expose through Server-Timing response headers on the main document — typically backend time, cache status or experiment flags.

Server timings

4 entries
NameDurationDescription
cfCacheStatus0 msDYNAMIC
cfEdge4 ms
cfOrigin100 ms
cfExtPri0 ms

Custom metrics collected through JavaScript

There are no custom configured scripts.

Extra metrics collected using scripting

There are no custom extra metrics from scripting.

PageXray

How the page is built.

HTTP versionH3
Total requests98
Total domains15
Transfer size4.1 MB
Content size7.5 MB
Missing compression1
Cookies20 third-party

Main document

status 200 · 0 redirects

https://stf.xelta.ai/ai-studio/xelta-prism/playground

HeaderValue
alt-svch3=":443"; ma=86400
cache-controls-maxage=50, stale-while-revalidate=31535950
cf-cache-statusDYNAMIC
cf-raya23cc7a379140522-BOM
content-encodingzstd
content-typetext/html; charset=utf-8
dateFri, 31 Jul 2026 12:59:21 GMT
expect-ctmax-age=86400, enforce
nel{"report_to":"cf-nel","success_fraction":0.0,"max_age":604800}
priorityu=0,i
referrer-policysame-origin strict-origin-when-cross-origin
report-to{"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=Y9KKKxkAAyuLGTNdoVaPKiabYegjFugxSWteIBKeWQPPWj4mniA4p3Wt4Z1HpeuOpjPZcz69xayroMrsY%2BuqDIGRlc4z6WM3o%2BLxxmyFPiK0U5LhWiQ27IiznNIQK8s%3D"}]}
servercloudflare
server-timingcfCacheStatus;desc="DYNAMIC" cfEdge;dur=4,cfOrigin;dur=100 cfExtPri
speculation-rules"/cdn-cgi/speculation"
strict-transport-securitymax-age=31536000; includeSubDomains; preload
varyrsc, next-router-state-tree, next-router-prefetch, next-router-segment-prefetch, Accept-Encoding
x-content-type-optionsnosniff
x-frame-optionsSAMEORIGIN
x-nextjs-cacheHIT
x-nextjs-prerender1 1
x-nextjs-stale-time300
x-xss-protection1; mode=block

Response codes

200
7374.5%
202
88.2%
204
88.2%
302
11.0%
401
33.1%
403
22.0%
404
33.1%

Largest assets on the page (by transfer size)

Top 20 of 98

Requests and sizes per content type

9 types

Transfer size4.1 MB

  • image51.9%
  • javascript27.1%
  • favicon15.4%
  • font3.1%
  • css1.8%
  • html0.42%
  • plain0.19%
  • json0.11%
  • other0.02%

Content size7.4 MB

  • javascript52.1%
  • image28.6%
  • favicon8.8%
  • css7.3%
  • font1.7%
  • html1.5%
  • json0.06%
  • other0.00%
  • plain0.00%

Requests89

  • javascript51.7%
  • plain19.1%
  • image12.4%
  • json5.6%
  • other4.5%
  • css2.2%
  • font2.2%
  • html1.1%
  • favicon1.1%
ContentHeader SizeTransfer SizeContent SizeRequests
html0 b17.7 KB116.3 KB1
css0 b74.6 KB556.8 KB2
javascript0 b1.1 MB3.9 MB46
image0 b2.1 MB2.1 MB11
font0 b131.7 KB130.6 KB2
favicon0 b648.8 KB668.8 KB1
other0 b691 B151 B4
json0 b4.8 KB4.8 KB5
plain0 b7.9 KB16 B17
Total0 b4.1 MB7.4 MB89

Data per domain

15 domains
DomainTotal download timeTransfer SizeContent SizeRequests
stf.xelta.ai18.973 s3.8 MB6.2 MB66
www.googletagmanager.com498 ms180.8 KB548.3 KB1
static.cloudflareinsights.com62 ms11.3 KB30.9 KB1
connect.facebook.net380 ms165.0 KB657.3 KB2
seob.stg.xelta.ai142 ms255 B28 B1
devpmt.xelta.ai1.979 s2.9 KB3.5 KB4
stb.xelta.ai233 ms2.2 KB118 B4
www.google-analytics.com388 ms56 B0 b2
analytics.google.com347 ms56 B0 b2
stats.g.doubleclick.net105 ms555 B0 b1
www.google.co.in408 ms63 B42 B1
us-assets.i.posthog.com900 ms60 B0 b2
cms-b.stg2.xelta.ai549 ms807 B43 B1
telemetry.matchbestsoftware.online106 ms2.2 KB16 B9
us.i.posthog.com766 ms496 B174 B1

Expires & last-modified statistics

typeminmedianmax
Expires0 seconds1 week1 year
Last modified26 seconds1 day6 weeks

Requests loaded after onLoad event

57 requests

Includes requests done after load event end.

ContentTransfer SizeRequests
html0 b0
css0 b0
javascript413.5 KB13
image2.1 MB10
font83.7 KB1
favicon648.8 KB1
plain7.9 KB17
json3.7 KB4
other0 b3
Total3.3 MB57

Requests loaded after onContentLoad

58 requests

Includes requests done after DOM content loaded.

ContentTransfer SizeRequests
html0 b0
css0 b0
javascript413.5 KB13
image2.1 MB10
font83.7 KB1
favicon648.8 KB1
plain7.9 KB17
json3.7 KB4
other0 b3
Total3.3 MB58

CPU

303 ms of 933 ms total. Defer it, replace it with a lighter alternative, or move its work off the main thread to recover most of your TBT.
Get deeper CPU insight with one extra run
Run with --enableProfileRun to see where main-thread time went, blocking time and CPU cost per script, module and function, forced reflows and frame stability. The data is collected in one extra run, so the timing metrics of your measured runs stay untouched.

Long tasks

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

TBT771 ms
Max potential input delay264 ms
Total long tasks11
Total time1.717 s
Last task at8.423 s
Before first paint496 ms2 tasks
Before FCP496 ms2 tasks
Before LCP496 ms2 tasks
After load1.562 s10 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 frames18showing the 10 with the most blocking time
Blocking time1.567 sacross all long frames — what hurts INP and TBT
Forced style & layout0.4 msscripts reading layout mid-frame
Blocking before LCP574.9 msdelaying the largest paint — fix these first
Blocking after load1.095 safter the load event — didn't delay page load

What to fix first

ScriptFramesTime runningBlocking (share by run time)Forced style & layoutTriggered by
main.js2428.5 ms303 ms0.4 msscript tag
js3rd party2270.6 ms170.6 msscript tag, timer or animation callback
16~qkdybp3eg6.js1193 ms148.4 msscript tag
rocket-loader.min.js2105.4 ms103.6 msscript tag, event handler
v4513226cdae34746b4dedf0b4dfa099e17817915094963rd party165.5 ms65.5 msmodule script
fbevents.js3rd party1114.2 ms64.3 msscript tag
0w-tb20otfze_.js185 ms36.2 msscript tag
inline script in the document129.3 ms29.3 msevent handler
FrameRequestCallback113.2 ms13.2 mstimer or animation callback
0uwndjb.d5fwx.js162 ms12.1 msscript 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 · 534.4 msat 359.8 ms · before LCP
blocking 438 ms
  • Scripts & other work201.3 ms
  • Animation callbacks13.3 ms
  • Style & layout319.8 ms
  • Render0 ms
5 scripts ran during this frame
Ran for
46.1 ms
How it started
script tag
Ran for
65.5 ms
How it started
module script
Ran for
29.3 ms
Started by
#document.onDOMContentLoaded
How it started
event handler
Source function
c
Position in source
character 22 into the file (locate it via DevTools → Performance → the Long Animation Frames track)
Ran for
51.3 ms
Started by
DOMWindow.onload
How it started
event handler
Position in source
character 8077 into the file (locate it via DevTools → Performance → the Long Animation Frames track)
FrameRequestCallback
Ran for
13.2 ms
Started by
FrameRequestCallback
How it started
timer or animation callback
Source function
$RV
Position in source
character 19 into the file (locate it via DevTools → Performance → the Long Animation Frames track)
Long animation frame #2 · 447 msat 1.412 s · after load
blocking 343.7 ms
  • Scripts & other work446.9 ms
  • Animation callbacks0 ms
  • Style & layout0.1 ms
  • Render0 ms
2 scripts ran during this frame
Ran for
193 ms
How it started
script tag
Ran for
8 ms
Started by
#document.onload
How it started
event handler
Source function
c
Position in source
character 9348 into the file (locate it via DevTools → Performance → the Long Animation Frames track)
Long animation frame #3 · 290.8 msat 1.860 s · after load
blocking 215.6 ms
  • Scripts & other work290 ms
  • Animation callbacks0.8 ms
  • Style & layout0 ms
  • Render0 ms
1 script ran during this frame · forced style & layout 0.2 ms
Ran for
264.9 ms
Forced style and layout
0.2 ms
How it started
script tag
Ran in
an iframe inside this page
Long animation frame #4 · 196.4 msat 2.675 s · after load
blocking 146.4 ms
  • Scripts & other work196.4 ms
  • Animation callbacks0 ms
  • Style & layout0 ms
  • Render0 ms
1 script ran during this frame
js3rd party
Ran for
196.1 ms
How it started
script tag
Long animation frame #5 · 186.9 msat 1.217 s · before LCP
blocking 136.9 ms
  • Scripts & other work186.9 ms
  • Animation callbacks0 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.

Long animation frame #6 · 175.8 msat 2.151 s · after load
blocking 113.8 ms
  • Scripts & other work175.6 ms
  • Animation callbacks0.2 ms
  • Style & layout0 ms
  • Render0 ms
1 script ran during this frame · forced style & layout 0.2 ms
Ran for
163.6 ms
Forced style and layout
0.2 ms
How it started
script tag
Ran in
an iframe inside this page
Long animation frame #7 · 114.4 msat 3.311 s · after load
blocking 64.4 ms
  • Scripts & other work114.4 ms
  • Animation callbacks0 ms
  • Style & layout0 ms
  • Render0 ms
1 script ran during this frame
fbevents.js3rd party
Ran for
114.2 ms
How it started
script tag
Long animation frame #8 · 87.2 msat 3.034 s · after load
blocking 37.1 ms
  • Scripts & other work87.1 ms
  • Animation callbacks0 ms
  • Style & layout0.1 ms
  • Render0 ms
1 script ran during this frame
Ran for
85 ms
How it started
script tag
Long animation frame #9 · 74.5 msat 2.952 s · after load
blocking 24.5 ms
  • Scripts & other work74.5 ms
  • Animation callbacks0 ms
  • Style & layout0 ms
  • Render0 ms
1 script ran during this frame
js3rd party
Ran for
74.5 ms
Started by
TimerHandler:setTimeout
How it started
timer or animation callback
Long animation frame #10 · 62.1 msat 3.139 s · after load
blocking 12.1 ms
  • Scripts & other work62.1 ms
  • Animation callbacks0 ms
  • Style & layout0 ms
  • Render0 ms
1 script ran during this frame
Ran for
62 ms
How it started
script tag

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.

Third party

Third party requests categorised by Third party web version 0.29.2.

Third-party requests19
Tools6
Categories6

Categories

6 categories

Requests by category19

  • survelliance9 req · 5 tools47.4%
  • analytics4 req · 1 tool21.1%
  • utility2 req · 2 tools10.5%
  • social2 req · 1 tool10.5%
  • tag-manager1 req · 1 tool5.3%
  • ad1 req · 1 tool5.3%

Third party requests and tools

6 categories
tag-managerGoogle Tag Manager1 requests · 1 tool
survellianceGoogle Tag ManagerFacebookGoogle Analytics+ 2 more9 requests · 5 tools
utilityCloudflareOther Google APIs/SDKs2 requests · 2 tools
socialFacebook2 requests · 1 tool
analyticsGoogle Analytics4 requests · 1 tool
adGoogle/Doubleclick Ads1 requests · 1 tool

Unmatched third party domains

3 domains

Domains that didn't match any tool in Third party web. If you are sure they are third party domains, please do a PR to that project. You can also fine tune the list using --firstParty.

  • us-assets.i.posthog.com
  • telemetry.matchbestsoftware.online
  • us.i.posthog.com

First party vs third party

76 first · 22 third party

Transfer size4.1 MB

  • First party3.8 MB91.5%
  • Third party360.6 KB8.5%

Content size7.5 MB

  • First party6.3 MB83.8%
  • Third party1.2 MB16.2%

Requests98

  • First party7677.6%
  • Third party2222.4%

First party requests and sizes per content type

76 requests

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

ContentHeader SizeTransfer SizeContent SizeRequests
html0 b17.7 KB116.3 KB1
css0 b74.6 KB556.8 KB2
javascript0 b786.1 KB2.7 MB42
image0 b2.1 MB2.1 MB10
font0 b131.7 KB130.6 KB2
favicon0 b648.8 KB668.8 KB1
other0 b691 B151 B4
json0 b4.8 KB4.8 KB5
plain0 b5.0 KB0 b3
TotalN/A3.8 MB6.3 MB76

Third party requests and sizes per content type

22 requests
ContentHeader SizeTransfer SizeContent SizeRequests
html0 b0 b0 b0
css0 b0 b0 b0
javascript0 b357.2 KB1.2 MB4
image0 b63 B42 B1
font0 b0 b0 b0
favicon0 b0 b0 b0
plain0 b2.9 KB16 B14
TotalN/A360.6 KB1.2 MB22