Run 1 summary

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

Tested 2026-10-03 08:41:29 using Chrome 150.0.7871.46 (runtime settings)

SummaryWaterfallMetricsRenderingCoachPageXrayThird party

Summary

Google Web Vitals

1.131 sTTFB
12.824 sLargest Contentful Paint
0.030Cumulative Layout Shift
4.606 sTotal Blocking Time

Loading

1.936 sFirst Paint
19.186 sFully Loaded
921 msMax Potential FID

Page weight & requests

5.4 MBTotal transfer size
9.8 MBTotal content size
141Requests

CPU

29Long tasks
21.770 sLast long task at

Visual progress

1.600 sFirst Visual Change
6.596 sSpeed Index
12.800 sVisual Complete 85%
15.900 sVisual Complete 99%
18.733 sLast Visual Change
Screenshot
Run 1 · after page complete

Waterfall

First paintFCPLCPDOMContentLoadedDOM interactiveLoadRender-blockingRedirectError

Rendering

Run 1
0.000 s
0s5s10s15s

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

170 frames

Use --filmstrip.showAll to show all filmstrips.

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Frame at 18.800 s
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100 %

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

Why was rendering delayed?

The server dominated the wait. The first byte took 1.131 s (58 % of the time to First Contentful Paint). Nothing can render before it arrives, and Google Web Vitals considers a TTFB over 800 ms in need of improvement. See the request timing on the Waterfall tab. First paint landed at 1.936 s. The largest paint followed at 12.824 s.

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

Render blocking requests

32 requests · 533.8 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 1.131 s
349 ms
743 B346 ms
15xd3qylw24qe.jspotentially blocking
javascript · xelta.ai
531 ms
50.3 KB531 ms
0jsw8vwf0d7mx.jspotentially blocking
javascript · xelta.ai
501 ms
24.6 KB501 ms
3s9mfzs0j6-c5.jspotentially blocking
javascript · xelta.ai
491 ms
35.7 KB491 ms
36e4qmt5xjii1.jspotentially blocking
javascript · xelta.ai
484 ms
20.5 KB484 ms
2z00ryerphly5.jspotentially blocking
javascript · xelta.ai
481 ms
11.5 KB481 ms
0qyvbpb01vddd.jspotentially blocking
javascript · xelta.ai
475 ms
13.6 KB475 ms
36h4r9duhyjke.jspotentially blocking
javascript · xelta.ai
470 ms
11.1 KB470 ms
0qyja2b6pvkmf.jspotentially blocking
javascript · xelta.ai
470 ms
9.8 KB470 ms
24 more requests
all done by 1.956 s
356.8 KB
LCP resource
1784118549413-zpb0.mp4 — downloaded by 9.735 s, rendered at 12.824 s
3.363 s
359 B3.363 s
web font · xelta.ai · finished after first paint
86 ms
8.8 KB86 ms
web font · fonts.gstatic.com · finished after first paint
172 ms
8.1 KB172 ms
web font · xelta.ai · finished after first paint
78 ms
37.7 KB78 ms
03.206 s6.412 s9.618 sFCP 1.936 sLCP 12.824 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

60
5 errors14 warnings4 info
warn(0)Don't scale images in the browseravoidScalingImages

The page has 19 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.

error(0)Have a fast largest contentful paintlargestContentfulPaint

Largest contentful paint is poor 12.824 s. It is in the Google Web Vitals poor range, slower than 4 seconds.

Largest contentful paint is one of Google Web Vitals and reports the render time of the largest image or text block visible within the viewport, relative to when the page first started loading. To be fast according to Google, it needs to render before 2.5 seconds and results over 4 seconds is poor performance.

Offenders
warn(0)Avoid CPU Long TaskslongTasks

The page has 30 CPU long tasks with the total of 6.412 s. The total blocking time is 4.638 s and 3 long tasks before first contentful paint with total time of 424 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
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  • self
  • self
  • self
  • unknown
  • self
  • self
  • self
  • self
  • self
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warn(0)Serve images in modern formats (AVIF, WebP)modernImageFormats

The page ships 10 images (out of 10) 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(0)Avoid extra requests by setting cache headerscacheHeaders

The page has 19 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 1.1 MB 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 1.6 MB and the uncompressed size is 5.3 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://xelta.ai/analytics/meta-pixel.js1.6 KB514 B
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
https://xelta.ai/_next/static/chunks/3er0xpd5wsvv-.js11.3 KB38.9 KB
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
https://xelta.ai/_next/static/chunks/0t_azj0-sejjh.js6.0 KB18.7 KB
https://xelta.ai/_next/static/chunks/1yr_jxmf7_41s.js5.9 KB14.4 KB
https://xelta.ai/_next/static/chunks/01_sax6s6jj2z.js10.7 KB28.2 KB
https://xelta.ai/_next/static/chunks/0j5-upgf4c25r.js10.3 KB26.6 KB
https://xelta.ai/_next/static/chunks/2f2i__v854m6r.js9.2 KB30.0 KB
https://xelta.ai/_next/static/chunks/2tvtj2r-wqy3b.js16.4 KB50.9 KB
https://xelta.ai/_next/static/chunks/3wuo8wdooey29.js8.4 KB34.0 KB
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https://xelta.ai/_next/static/chunks/3pqwhuc6tkpmg.js10.7 KB27.0 KB
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https://xelta.ai/_next/static/chunks/1spzo3397ba2t.js6.5 KB14.5 KB
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https://xelta.ai/_next/static/chunks/36e4qmt5xjii1.js20.5 KB57.3 KB
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https://xelta.ai/_next/static/chunks/3nqqxw7a3dqfp.js2.0 KB1.8 KB
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https://xelta.ai/_next/static/chunks/15xd3qylw24qe.js50.3 KB192.5 KB
https://connect.facebook.net/en_US/fbevents.js113.0 KB418.5 KB
https://xelta.ai/_next/static/chunks/32w4p10g8-c72.js2.9 KB4.1 KB
https://xelta.ai/_next/static/chunks/0-5jyzcgsf7lb.js3.9 KB8.0 KB
https://xelta.ai/_next/static/chunks/1j-r2jve0i765.js10.9 KB37.8 KB
https://xelta.ai/_next/static/chunks/11xynv20myc_u.js6.5 KB18.2 KB
https://xelta.ai/_next/static/chunks/2sj06e750b-9m.js2.8 KB4.1 KB
https://xelta.ai/_next/static/chunks/3pw1t4x1t1c85.js6.7 KB15.8 KB
https://xelta.ai/_next/static/chunks/1nlwvy4lxglg9.js1.2 KB151 B
https://xelta.ai/_next/static/chunks/1hm-bpdpqzgi3.js2.7 KB4.4 KB
https://xelta.ai/_next/static/chunks/1dmy8154hi6g8.js6.3 KB18.4 KB
https://xelta.ai/_next/static/chunks/3aea5tta4zd_f.js1.2 KB151 B
https://xelta.ai/_next/static/chunks/3u0_bvww80a5_.js9.4 KB30.5 KB
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https://xelta.ai/_next/static/chunks/1syhowumx8u35.js1.4 KB607 B
https://xelta.ai/_next/static/chunks/2lux080i15kgj.js1.7 KB1.2 KB
https://xelta.ai/_next/static/chunks/3c9-jx0jhg1zb.js2.1 KB1.8 KB
https://connect.facebook.net/signals/config/1123404090023729.../1123404090023729158.7 KB562.2 KB
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://xelta.ai/analytics/gtm.js1.6 KB403 B
https://www.googletagmanager.com/gtag/js?id=G-CPG3NLBKHP189.4 KB576.1 KB
https://xelta.ai/analytics/ga4.js1.4 KB144 B
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https://www.googletagmanager.com/gtm.js?id=GTM-5XNS5NQ2116.5 KB329.4 KB
https://xelta.ai/_next/static/chunks/3f1tw02kuplod.js3.2 KB6.2 KB
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warn(0)Total page size shouldn't be too bigpageSize

The page total transfer size is 5.6 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_generation/seedance-2-0-mini-video-generationN/A0 b
https://xelta.ai/models/video-generation/seedance-2-0-mini-video-generation33.0 KB246.4 KB
https://xelta.ai/cdn-cgi/speculation723 B151 B
https://xelta.ai/_next/static/media/83afe278b6a6bb3c-s.p.2bn3s6zvc0dyp.woff248.3 KB47.3 KB
https://xelta.ai/_next/static/chunks/0ffzk2r_njpiq.css94.0 KB688.7 KB
https://xelta.ai/_next/static/chunks/24aqi5k581skx.css4.1 KB24.5 KB
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infoAvoid too many fontsfewFonts

The page has 7 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
error(50)Have a fast first contentful paintfirstContentfulPaint

First contentful paint can be improved (1.936 s). It is in the Google Web Vitals needs improvement range, slower than 1.8 seconds.

The First Contentful Paint (FCP) metric measures the time from when the page starts loading to when any part of the page content is rendered on the screen. For this metric, "content" refers to text, images (including background images), <svg> elements, or non-white <canvas> elements.

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

The total CSS transfer size is 101.9 kB and uncompressed size is 739.6 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/0ffzk2r_njpiq.css94.0 KB688.7 KB
https://xelta.ai/_next/static/chunks/24aqi5k581skx.css4.1 KB24.5 KB
https://fonts.googleapis.com/css2...ogleapis.com/css21.4 KB9.0 KB
warn(50)Total image size shouldn't be too bigimageSize

The page total image size is 3.5 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(60)Don't use private headers on static contentprivateAssets

The page has 4 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
infoLong cache headers is goodcacheHeadersLong

The page has 38 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
error(80)Avoid missing and error requestsresponseOk

The page has 2 error responses. The page has 1 response with code 401. The page has 1 response with code 503.

Your page should never request assets that return a 400 or 500 error. These requests are never cached. If that happens something is broken. Please fix it.

Offenders
error(90)Avoid Frontend single point of failuresspof

The page has 1 request inside of the head that can cause a SPOF (single point of failure). Load them asynchronously or move them outside of the document head.

A page can be stopped from loading in the browser if a single JavaScript, CSS, and in some cases a font, couldn't be fetched or is loading really slowly (the white screen of death). That is a scenario you really want to avoid. Never load 3rd-party components synchronously inside of the head tag.

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://xelta.ai/models/video-generation/seedance-2-0-mini-video-generation33.0 KB246.4 KB
infoMake each CSS response smalloptimalCssSize

https://xelta.ai/_next/static/chunks/0ffzk2r_njpiq.css size is 96.3 kB (96253) 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/0ffzk2r_njpiq.css94.0 KB688.7 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

85
1 warning4 info
infoAvoid unnecessary headersunnecessaryHeaders

There are 1 response that sets a p3p header. There are 6 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 138 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 172 characters, the recommended max is 160

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

warn(50)Avoid too many third party requeststhirdParty

The page do 13% requests to third party domains (18 requests and 1.7 MB). First party is 123 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.

infoAvoid use too many response headersmanyHeaders

https://xelta.ai/api...api/page-metadata has 31 headers.https://xelta.ai/api...nts/active-banner has 34 headers.https://xelta.ai/api...cms/announcements has 34 headers.https://xelta.ai/api...nt/public/pricing has 34 headers.https://xelta.ai/api...eo_generation/all has 31 headers.https://xelta.ai/api...-video-generation has 31 headers.https://xelta.ai/api...cms/notifications has 33 headers.https://xelta.ai/api...cms/notifications has 33 headers.https://xelta.ai/api...i/community/posts has 32 headers.https://xelta.ai/api/cms/maintenance has 33 headers.https://xelta.ai/api...cms/notifications has 33 headers.https://xelta.ai/api/geo has 32 headers.

Avoid send too many response headers.

Offenders
infoDo not send too long headerslongHeaders

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/_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 607 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. https://media.xelta....051057121-1o8.mp4 has a header report-to that is 621 characters long. https://media.xelta....2569-5bce778d.jpg has a header report-to that is 613 characters long. https://xelta.ai/cdn-cgi/rum? has a header report-to that is 607 characters long.

Do not send response headers that are too long.

Offenders

Privacy advice

66
6 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 4 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 9% requests that are 3rd party (12 requests with a size of 613.5 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 10 survelliance requests and uses 6 survelliance tools. The page do 10 surveillance requests and uses 6 surveillance tools. The page do 2 utility requests and uses 2 utility tools. The page do 3 social requests and uses 1 social tool. The page do 2 tag-manager requests and uses 1 tag-manager 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

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 Mini - AI ModelThe document title, shown in the browser tab and used by search results.
Layout viewport1355 × 3051 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 elements1,880Very 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 tags77Number 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 storage9.5 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

4 hints
dns-prefetch
  • https://media.xelta.ai/
preconnect
  • https://fonts.googleapis.com/
  • https://fonts.gstatic.com/
  • 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

20 tools

Data collected using Third Party Web version 0.29.2.

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

Visual Metrics

Visual milestones

all times from navigation start
Speed Index6.60 show quickly the page looked done
First Visual Change1.60 sfirst paint reaches the screen
Last Visual Change18.73 sscreen stops changing · 17.13 s after first
≥95% rendered
≥99%
1.60 sFirst Visual Change
Visual Complete 85% · Visual Complete 95%12.80 s
Visual Complete 99%15.90 s
Last Visual Change18.73 s
Visual Readiness17.13 s· first to last change
05.0 s10.0 s15.0 s
Content milestones
Perception index
Visual progress
Visual progress at 0 s0.0s
Visual progress at 3.8 s3.8s
Visual progress at 6.5 s6.5s
Visual progress at 9.1 s9.1s
Visual progress at 11.6 s11.6s
Visual progress at 14 s14.0s
Visual progress at 16.4 s16.4s
Visual progress at 18.8 s18.8s
FCP1.94s
LCP12.82s
VC8512.80s
Long tasks
0.0s3.8s7.5s11.3s15.0s18.8s

Google Web Vitals

1.131 sTTFB
Needs improvement
1.936 sFCP
Needs improvement
4.606 sTBT
Poor

Largest Contentful Paint

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

12.824 sLCP render time

Phase breakdown

  • TTFB1.131 s
  • Resource load delay57.855 s
  • Resource load duration35 ms
  • Element render delay-46197 ms

Element

Element type
<video>
Size (w × h)
48059
URL
https://media.xelta....18549413-zpb0.mp4
Load time
0 ms

DOM path

body > div#app-root > div:eq(1) > div > div > div > div:eq(0) > div:eq(1) > div > div > div:eq(0) > video
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.

0.030cumulative 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.

  • #10.030<div class="poppins_8788b8ac-module__bl1qya__variable roboto_serif_a531ab31-module__m0C-eG__variable font-montserrat roboto_5896e949-module__TqIgsq__variable anton_cc568568-module__F3nZXa__variable"></div>
    body > div#app-root > div:eq(1)
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
TTFB1.131 s
Fully loaded19.186 s

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 msMISS
cfEdge94 ms–
cfOrigin595 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 listeners1602
Layout objects1821
Media key sessions0
Media keys0
Nodes4752
Resources170
Context lifecycle state observers101
V8 per context datas2
Worker global scopes0
Uacss resources6
Rtc peer connections0
Resource fetchers7
Ad subframes0
Detached script states2
Array buffer contents13
Layout count49
Recalc style count1344
Layout duration724
Recalc style duration1505
Dev tools command duration137
Script duration4519
V8 compile duration29
Task duration17919
Task other duration11006
Thread time16
Process time37
JS heap used size26886628
JS heap total size50479104
First meaningful paint4744

PageXray

How the page is built.

HTTP versionHTTP/2.0
Total requests141
Total domains16
Transfer size5.4 MB
Content size9.8 MB
Missing compression1
Cookies100 third-party

Main document

status 200 · 1 redirect

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

HeaderValue
alt-svch3=":443"; ma=86400
cf-cache-statusBYPASS
cf-raya44aa5f11be559ea-DEL
dateSat, 03 Oct 2026 08:41:31 GMT
expect-ctmax-age=86400, enforce
location/models/video-generation/seedance-2-0-mini-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-generation/seedance-2-0-mini-video-generation
report-to{"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=na9EqxtqBgM0Gb%2FlEnavFCVJs77CTd7xDYo4kiLGRKcBLSaqRKQR7WnBNNsSMIPMupDrW6at7HCWps5TglSiJ4AX%2B4UVVWLyJf9g2JZXNKhokCaw%2FmnHwscy"}]}
servercloudflare
server-timingcfCacheStatus;desc="BYPASS" cfEdge;dur=208,cfOrigin;dur=3
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
12790.1%
202
10.7%
204
42.8%
206
64.3%
308
10.7%
401
10.7%
503
10.7%

Largest assets on the page (by transfer size)

Top 20 of 141

Requests and sizes per content type

10 types

Transfer size5.4 MB

  • image62.9%
  • javascript28.9%
  • font3.4%
  • css1.8%
  • video1.6%
  • html0.60%
  • json0.59%
  • favicon0.17%
  • plain0.05%
  • other0.01%

Content size9.8 MB

  • javascript51.0%
  • image34.1%
  • css7.2%
  • video3.1%
  • html2.4%
  • font1.8%
  • json0.29%
  • favicon0.08%
  • other0.00%
  • plain0.00%

Requests138

  • javascript45.7%
  • image24.6%
  • json11.6%
  • font5.1%
  • video4.3%
  • plain4.3%
  • css2.2%
  • html0.72%
  • favicon0.72%
  • other0.72%
ContentHeader SizeTransfer SizeContent SizeRequests
html0 b33.0 KB246.4 KB1
css0 b99.5 KB722.2 KB3
javascript0 b1.6 MB5.0 MB63
image579 B3.4 MB3.4 MB34
font0 b185.9 KB179.1 KB7
favicon0 b9.6 KB8.3 KB1
other0 b723 B151 B1
json0 b32.3 KB28.9 KB16
video0 b88.1 KB317.0 KB6
plain0 b2.6 KB2 B6
Total579 B5.4 MB9.8 MB138

Data per domain

16 domains
DomainTotal download timeTransfer SizeContent SizeRequests
xelta.ai21.675 s1.6 MB4.5 MB109
fonts.googleapis.com862 ms1.4 KB9.0 KB1
static.cloudflareinsights.com185 ms10.1 KB29.6 KB1
connect.facebook.net438 ms271.7 KB980.7 KB2
vygxif9kfe.execute-api.ap-south-1.amazonaws.com273 ms852 B63 B1
fonts.gstatic.com173 ms8.1 KB7.6 KB1
mpc-prod-27-s6uit34pua-uk.a.run.app846 msN/A0 b1
media.xelta.ai38.632 s2.2 MB2.5 MB14
www.facebook.com176 ms288 B0 b1
pub-a5c9f998046243af9a6b5fdc3c07d449.r2.dev1.805 s1.0 MB1.0 MB2
www.googletagmanager.com1.284 s305.9 KB905.6 KB2
analytics.google.com540 msN/A0 b1
stats.g.doubleclick.net602 ms553 B0 b1
www.google.co.in456 ms408 B42 B1
us.i.posthog.com1.677 s286 B15 B1
telemetry.matchbestsoftware.online550 ms286 B2 B2

Expires & last-modified statistics

typeminmedianmax
Expires0 seconds1 year1 year
Last modified0 seconds2 days1 year

Requests loaded after onLoad event

18 requests

Includes requests done after load event end.

ContentTransfer SizeRequests
html0 b0
css0 b0
javascript652.5 KB8
image6.4 KB2
font0 b0
favicon9.6 KB1
plain2.3 KB5
json2.1 KB2
Total672.8 KB18

Requests loaded after onContentLoad

88 requests

Includes requests done after DOM content loaded.

ContentTransfer SizeRequests
html0 b0
css0 b0
javascript932.7 KB27
image3.3 MB25
font137.5 KB6
favicon9.6 KB1
json30.4 KB15
video88.1 KB6
plain2.6 KB6
Total4.5 MB88

Third party

Third party requests categorised by Third party web version 0.29.2.

Third-party requests22
Tools8
Categories8

Categories

8 categories

Requests by category22

  • survelliance10 req · 6 tools45.5%
  • social3 req · 1 tool13.6%
  • cdn2 req · 1 tool9.1%
  • utility2 req · 2 tools9.1%
  • tag-manager2 req · 1 tool9.1%
  • other1 req · 1 tool4.5%
  • analytics1 req · 1 tool4.5%
  • ad1 req · 1 tool4.5%

Third party requests and tools

8 categories
cdnGoogle Fonts2 requests · 1 tool
survellianceGoogle FontsFacebookGoogle Tag Manager+ 3 more10 requests · 6 tools
utilityCloudflareOther Google APIs/SDKs2 requests · 2 tools
socialFacebook3 requests · 1 tool
otherAmazon Web Services1 requests · 1 tool
tag-managerGoogle Tag Manager2 requests · 1 tool
analyticsGoogle Analytics1 requests · 1 tool
adGoogle/Doubleclick Ads1 requests · 1 tool

Unmatched third party domains

4 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
  • pub-a5c9f998046243af9a6b5fdc3c07d449.r2.dev
  • us.i.posthog.com
  • telemetry.matchbestsoftware.online

First party vs third party

123 first · 18 third party

Transfer size5.4 MB

  • First party3.8 MB70.5%
  • Third party1.6 MB29.5%

Content size9.8 MB

  • First party7.0 MB70.6%
  • Third party2.9 MB29.4%

Requests141

  • First party12387.2%
  • Third party1812.8%

First party requests and sizes per content type

123 requests

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

ContentHeader SizeTransfer SizeContent SizeRequests
html0 b33.0 KB246.4 KB1
css0 b98.1 KB713.2 KB2
javascript0 b1007.3 KB3.2 MB58
image0 b2.4 MB2.3 MB31
font0 b177.8 KB171.5 KB6
favicon0 b9.6 KB8.3 KB1
other0 b723 B151 B1
json0 b32.1 KB28.9 KB14
video0 b88.1 KB317.0 KB6
plain0 b1.5 KB0 b1
TotalN/A3.8 MB7.0 MB123

Third party requests and sizes per content type

18 requests
ContentHeader SizeTransfer SizeContent SizeRequests
html0 b0 b0 b0
css0 b1.4 KB9.0 KB1
javascript0 b587.7 KB1.9 MB5
image579 B1.0 MB1.0 MB3
font0 b8.1 KB7.6 KB1
favicon0 b0 b0 b0
json0 b286 B15 B2
plain0 b1.1 KB2 B5
Total563 B1.6 MB2.9 MB18