Run 1 summary

https://xelta.ai/models/video_audio_generation/seedance-2-0-video-generation

Tested 2026-10-07 06:24:02 using Chrome 150.0.7871.46 (runtime settings)

SummaryWaterfallMetricsRenderingCoachPageXrayThird party

Summary

Google Web Vitals

318 msTTFB
2.296 sLargest Contentful Paint
0.000Cumulative Layout Shift
465 msTotal Blocking Time

Loading

820 msFirst Paint
8.004 sFully Loaded
158 msMax Potential FID

Page weight & requests

4.8 MBTotal transfer size
9.1 MBTotal content size
150Requests

CPU

13Long tasks
5.121 sLast long task at

Visual progress

833 msFirst Visual Change
1.545 sSpeed Index
2.533 sVisual Complete 85%
2.567 sVisual Complete 99%
3.500 sLast Visual Change
Screenshot
Run 1 · after page complete

Waterfall

First paintFCPLCPDOMContentLoadedDOM interactiveLoadRender-blockingRedirectError

Rendering

Run 1
0.000 s
0s1s2s3s

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

29 frames

Use --filmstrip.showAll to show all filmstrips.

Frame at 0 ms
0 ms
0 %
Frame at 800 ms
800 ms
0 %
Frame at 900 ms
900 ms
54 %
Frame at 1.000 s
1.000 s
54 %
Frame at 1.100 s
1.100 s
54 %
Frame at 1.200 s
1.200 s
54 %
Frame at 1.300 s
1.300 s
54 %
Frame at 1.400 s
1.400 s
54 %
Frame at 1.500 s
1.500 s
54 %
Frame at 1.600 s
1.600 s
54 %
Frame at 1.700 s
1.700 s
54 %
Frame at 1.800 s
1.800 s
54 %
Frame at 1.900 s
1.900 s
59 %
Frame at 2.000 s
2.000 s
62 %
Frame at 2.100 s
2.100 s
67 %
Frame at 2.200 s
2.200 s
75 %
Frame at 2.300 s
2.300 s
63 %
Frame at 2.400 s
2.400 s
64 %
Frame at 2.500 s
2.500 s
64 %
Frame at 2.600 s
2.600 s
99 %
Frame at 2.700 s
2.700 s
99 %
Frame at 2.800 s
2.800 s
99 %
Frame at 2.900 s
2.900 s
99 %
Frame at 3.000 s
3.000 s
99 %
Frame at 3.100 s
3.100 s
99 %
Frame at 3.200 s
3.200 s
99 %
Frame at 3.300 s
3.300 s
99 %
Frame at 3.400 s
3.400 s
99 %
Frame at 3.500 s
3.500 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 820 ms on a 318 ms first byte. The largest paint followed at 2.296 s.

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

Render blocking requests

35 requests · 564.4 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 dashed line is FCP, the clock ends at LCP); 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
xelta.ai · TTFB 318 ms
273 ms
748 B272 ms
25ym4jnna99b5.jspotentially blocking
javascript · xelta.ai
302 ms
48.8 KB302 ms
1nc963b87-hng.jspotentially blocking
javascript · xelta.ai
299 ms
73.3 KB299 ms
0w4obsbt-nk9b.jspotentially blocking
javascript · xelta.ai
278 ms
52.4 KB278 ms
3-kt-3hnymlq2.jspotentially blocking
javascript · xelta.ai
268 ms
38.2 KB268 ms
2davzdixtsrdf.jspotentially blocking
javascript · xelta.ai
246 ms
20.1 KB246 ms
1b5sc5-f8-xm8.jspotentially blocking
javascript · xelta.ai
243 ms
18.1 KB243 ms
041fv4prytis7.jspotentially blocking
javascript · xelta.ai
231 ms
14.9 KB231 ms
0cmyvd9l216yh.jspotentially blocking
javascript · xelta.ai
209 ms
16.5 KB209 ms
27 more requests
all done by 923 ms
282.2 KB
web font · xelta.ai · finished after first paint
42 ms
8.6 KB42 ms
web font · xelta.ai · finished after first paint
64 ms
65.5 KB64 ms
web font · xelta.ai · finished after first paint
33 ms
37.7 KB33 ms
0574 ms1.148 s1.722 sFCP 820 msLCP 2.296 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

65
2 errors13 warnings4 info
warn(0)Don't scale images in the browseravoidScalingImages

The page has 18 images that are scaled more than 100 pixels. It would be better if those images are sent so the browser don't need to scale them.

It's easy to scale images in the browser and make sure they look good in different devices, however that is bad for performance! Scaling images in the browser takes extra CPU time and will hurt performance on mobile. And the user will download extra kilobytes (sometimes megabytes) of data that could be avoided. Don't do that, make sure you create multiple version of the same image server-side and serve the appropriate one.

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 13 CPU long tasks with the total of 1.162 s. The total blocking time is 465 ms and 1 long task before first contentful paint with total time of 97 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
  • unknown
  • self
  • unknown
  • self
  • self
  • self
  • self
  • self
  • self
  • self
  • self
  • self
  • self
warn(0)Avoid extra requests by setting cache headerscacheHeaders

The page has 23 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 40.2 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)Avoid redirecting the main documentdocumentRedirect

The main document gets redirected 1 time(s). Remove those redirect and make the page faster!

You should never ever redirect the main document, because it will make the page load slower for the user. Well, you should redirect the user if the user tries to use HTTP and there's an HTTPS version of the page. The coach checks for that. :)

Offenders
warn(0)Total JavaScript size shouldn't be too bigjavascriptSize

The total JavaScript transfer size is 1.7 MB and the uncompressed size is 5.5 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://static.cloudflareinsights.com/beacon.min.js/v31edd6df95cf4e85bb4c19e7a9bdbcba178836298749510.1 KB29.6 KB
https://xelta.ai/_next/static/chunks/0_cis5bf89bk3.js3.7 KB9.3 KB
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https://xelta.ai/_next/static/chunks/1nc963b87-hng.js73.3 KB232.0 KB
https://xelta.ai/_next/static/chunks/25ym4jnna99b5.js48.8 KB171.2 KB
https://xelta.ai/_next/static/chunks/turbopack-0igl2dhqvlhij.js6.6 KB18.4 KB
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https://xelta.ai/analytics/gtm.js1.6 KB403 B
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https://xelta.ai/analytics/ga4.js1.4 KB144 B
https://xelta.ai/analytics/meta-pixel.js1.6 KB514 B
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warn(0)Total page size shouldn't be too bigpageSize

The page total transfer size is 5 MB, which is more than the coach limit of 3 MB. That is insane 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://xelta.ai/models/video_audio_generation/seedance-2-0-video-generationN/A0 b
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https://xelta.ai/_next/static/chunks/3u0_bvww80a5_.js9.4 KB30.5 KB
https://xelta.ai/_next/static/chunks/0uqpbcbj6u3h-.js3.1 KB5.2 KB
https://xelta.ai/_next/image...ta.ai/_next/image43 B43 B
https://xelta.ai/_next/image...ta.ai/_next/image43 B43 B
https://xelta.ai/api/quiz/quiz-events/active-banner1.6 KB43 B
https://xelta.ai/api/cms/announcements?placement=APP_TOP1.6 KB26 B
https://xelta.ai/api/community/posts?sort=latest&limit=106.2 KB10.8 KB
https://xelta.ai/_next/image...ta.ai/_next/image29.6 KB28.4 KB
https://xelta.ai/_next/image...ta.ai/_next/image2.1 KB913 B
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https://xelta.ai/_next/image...ta.ai/_next/image8.2 KB7.0 KB
https://xelta.ai/_next/image...ta.ai/_next/image8.7 KB7.5 KB
https://xelta.ai/_next/image...ta.ai/_next/image8.8 KB7.6 KB
https://xelta.ai/_next/image...ta.ai/_next/image6.5 KB5.3 KB
https://xelta.ai/_next/image...ta.ai/_next/image5.3 KB4.2 KB
https://xelta.ai/_next/image...ta.ai/_next/image9.7 KB8.5 KB
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https://xelta.ai/api/media/AdfkgpXUV0LY2BbkZb-0hax7InUiOiJodHRwczovL21lZGlhLnhlb...I6MTc5MTM3NTg0Nn0490.2 KB488.5 KB
https://xelta.ai/api/media/AdaA4y5LW0jOsCl--_Nqscd7InUiOiJodHRwczovL21lZGlhLnhlb...I6MTc5MTM3NTg0Nn0179.7 KB178.1 KB
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https://xelta.ai/api/media/AaNAmbiFe6ot0Bb9iF-Kf2l7InUiOiJodHRwczovL21lZGlhLnhlb...I6MTc5MTM3NTg0Nn0171.4 KB169.7 KB
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https://xelta.ai/api/media/AaELc1a-0JE3EwUM_2o1C2B7InUiOiJodHRwczovL21lZGlhLnhlb...I6MTc5MTM3NTg0Nn0426.8 KB425.1 KB
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https://xelta.ai/analytics/gtm.js1.6 KB403 B
https://www.googletagmanager.com/gtag/js?id=G-CPG3NLBKHP189.8 KB577.8 KB
https://xelta.ai/analytics/ga4.js1.4 KB144 B
https://xelta.ai/analytics/meta-pixel.js1.6 KB514 B
https://xelta.ai/api/page-metadata...api/page-metadata1.7 KB717 B
https://xelta.ai/_next/static/chunks/1ki4hltmjvw2d.js77.6 KB253.9 KB
https://xelta.ai/_next/static/chunks/3eqf32mi79tsu.js6.9 KB16.3 KB
https://xelta.ai/_next/static/chunks/2_dwq4-jnemb3.js38.2 KB95.8 KB
https://xelta.ai/_next/static/chunks/3oj2nzvuofyjg.js40.5 KB103.0 KB
https://xelta.ai/_next/static/chunks/1mba6mmv45mo5.js1.6 KB838 B
https://xelta.ai/_next/static/chunks/39llvb0iqw2mj.js5.8 KB13.4 KB
https://xelta.ai/_next/static/chunks/3ivtpnqcuzdk5.js2.7 KB3.4 KB
https://xelta.ai/_next/static/chunks/0vv_1jbbburl3.js1.4 KB671 B
https://xelta.ai/_next/static/chunks/01ysbefej55j6.js6.4 KB14.9 KB
https://connect.facebook.net/en_US/fbevents.js113.1 KB418.9 KB
https://www.googletagmanager.com/gtm.js?id=GTM-5XNS5NQ2116.6 KB329.5 KB
https://xelta.ai/_next/static/chunks/3f1tw02kuplod.js3.2 KB6.2 KB
https://xelta.ai/_next/static/chunks/2k5vpzc_p9jpq.js35.3 KB106.7 KB
https://xelta.ai/api/credits/quote2.5 KB228 B
https://xelta.ai/api/geo1.8 KB155 B
https://www.googletagmanager.com/gtag/js?id=G-CPG3NLBKHP&cx=c&gtm=4e6a51189.9 KB577.8 KB
https://analytics.google.com/g/collect...gle.com/g/collectN/A0 b
https://stats.g.doubleclick.net/g/collect...ick.net/g/collect553 B0 b
https://www.google.co.in/ads/ga-audiences.../ads/ga-audiences408 B42 B
https://connect.facebook.net/signals/config/1123404090023729.../1123404090023729158.8 KB563.3 KB
https://mpc-prod-27-s6uit34pua-uk.a.run.app/events?cee=noN/A0 b
https://www.facebook.com/tr/422 B0 b
https://xelta.ai/_next/static/chunks/28r3ari2she5h.js1.2 KB217 B
https://xelta.ai/_next/static/chunks/2i62a4bub-y5v.js10.7 KB32.3 KB
https://xelta.ai/_next/static/chunks/38cqstpd1yycs.js47.0 KB206.7 KB
https://us.i.posthog.com/e/?_=1791354249342286 B15 B
https://telemetry.matchbestsoftware.online/faro/0 b0 b
https://telemetry.matchbestsoftware.online/faro/286 B2 B
warn(0)Don't use private headers on static contentprivateAssets

The page has 14 requests 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(20)Avoid missing and error requestsresponseOk
infoAvoid too many fontsfewFonts

The page has 6 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(50)Total CSS size shouldn't be too bigcssSize

The total CSS transfer size is 100 kB and uncompressed size is 714.9 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://xelta.ai/_next/static/chunks/19qzt7hy89jld.css94.2 KB689.5 KB
https://xelta.ai/_next/static/chunks/2y7vqocokaqma.css1.9 KB6.4 KB
https://xelta.ai/_next/static/chunks/2951_j97le6r5.css1.7 KB2.3 KB
warn(50)Total image size shouldn't be too bigimageSize

The page total image size is 2.9 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.

infoLong cache headers is goodcacheHeadersLong

The page has 34 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
infoAdd decoding="async" to non-critical imagesdecodingAsync
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://xelta.ai/models/video-audio-generation/seedance-2-0-video-generation33.7 KB252.5 KB
infoMake each CSS response smalloptimalCssSize

https://xelta.ai/_next/static/chunks/19qzt7hy89jld.css size is 96.4 kB (96412) 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://xelta.ai/_next/static/chunks/19qzt7hy89jld.css94.2 KB689.5 KB
warn(93)Lazy-load below-the-fold imageslazyLoadingImages

The page has 1 below-the-fold image 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(95)Inline CSS for faster first renderinlineCss

The page has both inline CSS and CSS requests even though it uses a HTTP/2-ish connection. If you have many users on slow connections, it can be better to only inline the CSS. Run your own tests and check the waterfall graph to see what happens.

In the early days of the Internet, inlining CSS was one of the ugliest things you can do. That has changed if you want your page to start rendering fast for your user. Always inline the critical CSS when you use HTTP/1 and HTTP/2 (avoid doing CSS requests that block rendering) and lazy load and cache the rest of the CSS. It is a little more complicated when using HTTP/2. Does your server support HTTP push? Then maybe that can help. Do you have a lot of users on a slow connection and are serving large chunks of HTML? Then it could be better to use the inline technique, becasue some servers always prioritize HTML content over CSS so the user needs to download the HTML first, before the CSS is downloaded.

error(99)Avoid using incorrect mime typesmimeTypes

The page has 1 misconfigured mime type.

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

92
4 info
infoAvoid unnecessary headersunnecessaryHeaders

There are 1 response that sets a p3p header. There are 5 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 147 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 194 characters, the recommended max is 160

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

infoAvoid use too many response headersmanyHeaders

https://xelta.ai/api...nt/public/pricing has 34 headers.https://xelta.ai/api/cms/maintenance has 35 headers.https://xelta.ai/api...cms/notifications has 34 headers.https://xelta.ai/api...cms/notifications has 34 headers.https://xelta.ai/api...io_generation/all has 31 headers.https://xelta.ai/api...-video-generation has 31 headers.https://xelta.ai/api...i/credits/options has 31 headers.https://xelta.ai/api...nts/active-banner has 33 headers.https://xelta.ai/api...cms/announcements has 33 headers.https://xelta.ai/api...i/community/posts has 32 headers.https://xelta.ai/api...joxNzkxMjY1MzgxfQ has 31 headers.https://xelta.ai/api...joxNzkxMjY1MzgxfQ has 32 headers.https://xelta.ai/api...iOjE3OTEyNjUzODF9 has 31 headers.https://xelta.ai/api...I6MTc5MTM3NTg0Nn0 has 35 headers.https://xelta.ai/api...joxNzkxMzc1ODQ2fQ has 35 headers.https://xelta.ai/api...I6MTc5MTM3NTg0Nn0 has 35 headers.https://xelta.ai/api...I6MTc5MTM3NTg0Nn0 has 35 headers.https://xelta.ai/api...I6MTc5MTM3NTg0Nn0 has 35 headers.https://xelta.ai/api...I6MTc5MTM3NTg0Nn0 has 35 headers.https://xelta.ai/api...I6MTc5MTM3NTg0Nn0 has 35 headers.https://xelta.ai/api...iOjE3OTEzNzU4NDZ9 has 35 headers.https://xelta.ai/api...I6MTc5MTM3NTg0Nn0 has 35 headers.https://xelta.ai/api...iOjE3OTEzNzU4NDZ9 has 35 headers.https://xelta.ai/api...api/page-metadata has 31 headers.https://xelta.ai/api/geo has 32 headers.

Avoid send too many response headers.

Offenders
infoDo not send too long headerslongHeaders

https://xelta.ai/_ne...ta.ai/_next/image has a header content-security-policy-report-only that is 805 characters long. https://xelta.ai/_ne...ta.ai/_next/image has a header report-to that is 611 characters long. https://xelta.ai/_ne...ta.ai/_next/image has a header content-security-policy-report-only that is 805 characters long. https://xelta.ai/_ne...ta.ai/_next/image has a header report-to that is 611 characters long. https://xelta.ai/cdn-cgi/rum? has a header report-to that is 609 characters long. https://xelta.ai/api/cms/maintenance has a header content-security-policy-report-only that is 805 characters long. https://xelta.ai/api/cms/maintenance has a header report-to that is 611 characters long. https://xelta.ai/api...joxNzkxMjY1MzgxfQ has a header content-security-policy-report-only that is 805 characters long. https://xelta.ai/api...joxNzkxMjY1MzgxfQ has a header report-to that is 613 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 permissions-policy that is 874 characters long. https://xelta.ai/api/credits/quote has a header content-security-policy-report-only that is 805 characters long. https://xelta.ai/api/credits/quote has a header report-to that is 605 characters long. https://connect.face.../1123404090023729 has a header content-security-policy that is 1344 characters long. https://connect.face.../1123404090023729 has a header permissions-policy that is 874 characters long.

Do not send response headers that are too long.

Offenders

Privacy advice

65
7 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 5 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
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 7% requests that are 3rd party (11 requests with a size of 799.1 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 2 utility requests and uses 2 utility tools. The page do 3 tag-manager requests 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 3 social requests and uses 1 social tool. The page do 1 analytics request 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
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
  • .facebook.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.

TitleSeedance 2.0 - AI ModelThe document title, shown in the browser tab and used by search results.
Layout viewport1355 × 3008 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 elements2,055Very large, slows layout and styleTotal HTML elements. Fewer means less for the browser to style, lay out and paint.
Avg DOM depth12How deeply elements are nested on average.
Max DOM depth21The deepest nesting on the page. Deep branches cost more style recalculation.
Iframes0No embedded documents on this page.
Script tags84Number 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 storage12.4 KBData the page saved in localStorage, kept across visits.
Session storage565 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

Third-party tools

17 tools

Data collected using Third Party Web version 0.29.2.

Utility
  • Cloudflare
  • Other Google APIs/SDKs
Other
  • Amazon Web Services
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
Social
  • Facebook
Analytics
  • Google Analytics
Ad
  • Google/Doubleclick Ads

Visual Metrics

Visual milestones

all times from navigation start
Speed Index1.54 show quickly the page looked done
First Visual Change0.83 sfirst paint reaches the screen
Last Visual Change3.50 sscreen stops changing · 2.67 s after first
nothing painted yet
≥99%
0.83 sFirst Visual Change
Visual Complete 85% · Visual Complete 95% · Visual Complete 99%2.53 s
Last Visual Change3.50 s
Visual Readiness2.67 s· first to last change
01.0 s2.0 s3.0 s
Content milestones
Perception index
Visual progress
Visual progress at 0 s0.0s
Visual progress at 1.1 s1.1s
Visual progress at 1.5 s1.5s
Visual progress at 1.9 s1.9s
Visual progress at 2.3 s2.3s
Visual progress at 2.7 s2.7s
Visual progress at 3.1 s3.1s
Visual progress at 3.5 s3.5s
FCP0.82s
LCP2.30s
VC852.53s
Long tasks
0.0s0.7s1.4s2.1s2.8s3.5s

Google Web Vitals

318 msTTFB
Good
465 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.

2.296 sLCP render time

Phase breakdown

  • TTFB318 ms
  • Resource load delay0 ms
  • Resource load duration0 ms
  • Element render delay1.978 s

Element

Element type
<div>
Size (w × h)
43778
Load time
0 ms

DOM path

body > div#app-root > div > div > div > div > div:eq(0) > div#playground-section > div > div:eq(0) > div:eq(1) > div:eq(1) > div > div:eq(1) > div:eq(0)
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

Elements that shifted

Sorted by individual shift score (higher = bigger shift). The top entries usually account for most of the page's CLS.

  • #10.000<div class="hidden lg:flex items-center flex-shrink-0 ml-auto"></div>
    body > div#app-root > header > div > div:eq(2)
  • #20.000<div class="hidden lg:flex items-center flex-shrink-0 ml-auto"></div>
    body > div#app-root > header > div > div:eq(2)
  • #30.000<div class="hidden lg:flex items-center flex-shrink-0 ml-auto"></div>
    body > div#app-root > header > div > div:eq(2)
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

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

3 entries
NameDurationDescription
cfCacheStatus0 msHIT
cfEdge4 ms–
cfOrigin0 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.

Chrome internal metrics (CDP)33
Audio handlers0
Audio worklet processors0
Documents7
Frames7
JS event listeners1649
Layout objects2027
Media key sessions0
Media keys0
Nodes3202
Resources151
Context lifecycle state observers107
V8 per context datas2
Worker global scopes0
Uacss resources6
Rtc peer connections0
Resource fetchers7
Ad subframes0
Detached script states4
Array buffer contents13
Layout count46
Recalc style count206
Layout duration135
Recalc style duration284
Dev tools command duration16
Script duration1608
V8 compile duration4
Task duration3274
Task other duration1226
Thread time3
Process time7
JS heap used size27175672
JS heap total size63324160
First meaningful paint819

PageXray

How the page is built.

HTTP versionHTTP/2.0
Total requests150
Total domains12
Transfer size4.8 MB
Content size9.1 MB
Missing compression1
Cookies101 third-party

Main document

status 200 · 1 redirect

https://xelta.ai/models/video-audio-generation/seedance-2-0-video-generation

HeaderValue
alt-svch3=":443"; ma=86400
cf-cache-statusBYPASS
cf-raya46ad219df5ec4b9-DEL
dateWed, 07 Oct 2026 06:24:04 GMT
expect-ctmax-age=86400, enforce
location/models/video-audio-generation/seedance-2-0-video-generation
nel{"report_to":"cf-nel","success_fraction":0.0,"max_age":604800}
referrer-policysame-origin strict-origin-when-cross-origin
refresh0;url=/models/video-audio-generation/seedance-2-0-video-generation
report-to{"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=KLYaAF1%2B2QkFr9%2BEk940nUIE2B0CsLV8iLWDofxsAojIOatuUwMYnxHXW9FE7%2BTxOc9ELWKW8GEVwPwWLQJhFUlB0683KUQs%2F718BY83Vdq9CzsC5HQn9%2Ftp"}]}
servercloudflare
server-timingcfCacheStatus;desc="BYPASS" cfEdge;dur=142,cfOrigin;dur=48
speculation-rules"/cdn-cgi/speculation"
strict-transport-securitymax-age=31536000; includeSubDomains; preload
varyaccept-encoding
x-content-type-optionsnosniff
x-frame-optionsSAMEORIGIN
x-xss-protection1; mode=block

Response codes

200
13690.7%
202
10.7%
204
42.7%
308
10.7%
400
42.7%
401
10.7%
410
32.0%

Largest assets on the page (by transfer size)

Top 20 of 150

Requests and sizes per content type

9 types

Transfer size4.8 MB

  • image58.2%
  • javascript34.5%
  • font3.6%
  • css2.0%
  • json0.77%
  • html0.69%
  • favicon0.20%
  • plain0.06%
  • other0.01%

Content size9.1 MB

  • javascript57.2%
  • image30.2%
  • css7.5%
  • html2.7%
  • font1.8%
  • json0.41%
  • favicon0.09%
  • other0.00%
  • plain0.00%

Requests141

  • javascript52.5%
  • image23.4%
  • json11.3%
  • font4.3%
  • plain4.3%
  • css2.1%
  • html0.71%
  • favicon0.71%
  • other0.71%
ContentHeader SizeTransfer SizeContent SizeRequests
html0 b33.7 KB252.5 KB1
css0 b97.7 KB698.2 KB3
javascript0 b1.7 MB5.2 MB74
image0 b2.8 MB2.7 MB33
font0 b177.8 KB171.5 KB6
favicon0 b9.6 KB8.3 KB1
other0 b717 B151 B1
json0 b37.6 KB38.3 KB16
plain0 b2.7 KB2 B6
Total0 b4.8 MB9.1 MB141

Data per domain

12 domains
DomainTotal download timeTransfer SizeContent SizeRequests
xelta.ai48.200 s4.0 MB6.7 MB135
static.cloudflareinsights.com169 ms10.1 KB29.6 KB1
vygxif9kfe.execute-api.ap-south-1.amazonaws.com196 ms852 B63 B1
www.googletagmanager.com1.858 s496.2 KB1.5 MB3
connect.facebook.net918 ms271.8 KB982.2 KB2
analytics.google.com380 msN/A0 b1
stats.g.doubleclick.net243 ms553 B0 b1
www.google.co.in232 ms408 B42 B1
mpc-prod-27-s6uit34pua-uk.a.run.app421 msN/A0 b1
www.facebook.com57 ms422 B0 b1
us.i.posthog.com1.380 s286 B15 B1
telemetry.matchbestsoftware.online185 ms286 B2 B2

Expires & last-modified statistics

typeminmedianmax
Expires0 seconds1 year1 year
Last modified24 minutes1 day4 weeks

Requests loaded after onLoad event

96 requests

Includes requests done after load event end.

ContentTransfer SizeRequests
html0 b0
css0 b0
javascript1.1 MB37
image2.7 MB24
font129.5 KB5
favicon9.6 KB1
plain2.7 KB6
json35.7 KB15
Total4.0 MB96

Requests loaded after onContentLoad

96 requests

Includes requests done after DOM content loaded.

ContentTransfer SizeRequests
html0 b0
css0 b0
javascript1.1 MB37
image2.7 MB24
font129.5 KB5
favicon9.6 KB1
plain2.7 KB6
json35.7 KB15
Total4.0 MB96

Third party

Third party requests categorised by Third party web version 0.29.2.

Third-party requests20
Tools7
Categories7
Third-party cookies1

Categories

7 categories

Requests by category20

  • survelliance9 req · 5 tools45.0%
  • tag-manager3 req · 1 tool15.0%
  • social3 req · 1 tool15.0%
  • utility2 req · 2 tools10.0%
  • other1 req · 1 tool5.0%
  • analytics1 req · 1 tool5.0%
  • ad1 req · 1 tool5.0%

Third party requests and tools

7 categories
utilityCloudflareOther Google APIs/SDKs2 requests · 2 tools
otherAmazon Web Services1 requests · 1 tool
tag-managerGoogle Tag Manager3 requests · 1 tool
survellianceGoogle Tag ManagerFacebookGoogle Analytics+ 2 more9 requests · 5 tools
socialFacebook3 requests · 1 tool
analyticsGoogle Analytics1 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.

  • mpc-prod-27-s6uit34pua-uk.a.run.app
  • us.i.posthog.com
  • telemetry.matchbestsoftware.online
Third party cookies1
.facebook.com1 cookie

First party vs third party

135 first · 15 third party

Transfer size4.8 MB

  • First party4.0 MB84.1%
  • Third party780.9 KB15.9%

Content size9.1 MB

  • First party6.7 MB73.2%
  • Third party2.4 MB26.8%

Requests150

  • First party13590.0%
  • Third party1510.0%

First party requests and sizes per content type

135 requests

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

ContentHeader SizeTransfer SizeContent SizeRequests
html0 b33.7 KB252.5 KB1
css0 b97.7 KB698.2 KB3
javascript0 b915.0 KB2.8 MB68
image0 b2.8 MB2.7 MB32
font0 b177.8 KB171.5 KB6
favicon0 b9.6 KB8.3 KB1
other0 b717 B151 B1
json0 b37.3 KB38.3 KB14
plain0 b1.5 KB0 b1
TotalN/A4.0 MB6.7 MB135

Third party requests and sizes per content type

15 requests
ContentHeader SizeTransfer SizeContent SizeRequests
html0 b0 b0 b0
css0 b0 b0 b0
javascript0 b778.2 KB2.4 MB6
image0 b408 B42 B1
font0 b0 b0 b0
favicon0 b0 b0 b0
plain0 b1.2 KB2 B5
json0 b286 B15 B2
TotalN/A780.9 KB2.4 MB15