Page summary

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

Tested 2026-08-19 17:41:09 using Chrome 150.0.7871.46 (runtime settings)

SummaryWaterfallMetricsRenderingCoachPageXrayCPUThird party

This page is fast to paint and snappy to interact with, but prone to layout shifts, loose on best practices and weak on user privacy.

75 / 100
Coach overall
82 / 100
Performance
74 / 100
Best practice
66 / 100
Privacy

How it loaded →

0 → 4.618 s · median run
Frame at 0 ms
start
Frame at 1000 ms
1.000 s
Frame at 1600 ms
1.600 s
Frame at 2300 ms
2.300 s
Frame at 2900 ms
Largest paint2.900 s
Frame at 4700 ms
Complete4.700 s
337 ms
First Visual Change
1.502 s
Speed Index
2.325 s
Visual Complete 85%
4.618 s
Last Visual Change
TTFB157 msLCP2.364 sTBT162 msCLS0.46

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 6 CPU long tasks with the total of 618 ms. The total blocking time is 162 ms and 2 long tasks before first contentful paint with total time of 256 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 21 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 19.9 kB the next access.

Google Web Vitals

min · median · mean · max of 1 run
MetricMinMedianMeanMax
Time To First Byte (TTFB)157 ms157 ms157 ms157 ms
Largest Contentful Paint (LCP)2.364 s2.364 s2.364 s2.364 s
Cumulative Layout Shift (CLS)0.46220.46220.46220.4622

Visual Metrics

min · median · mean · max of 1 run
MetricMinMedianMeanMax
First visual change337 ms337 ms337 ms337 ms
Last visual change4.618 s4.618 s4.618 s4.618 s
Speed index1.502 s1.502 s1.502 s1.502 s
Visual readiness4.281 s4.281 s4.281 s4.281 s
Visual complete 852.325 s2.325 s2.325 s2.325 s
Visual complete 952.528 s2.528 s2.528 s2.528 s
Visual complete 992.730 s2.730 s2.730 s2.730 s

CPU

min · median · mean · max of 1 run
MetricMinMedianMeanMax
Total Blocking Time162 ms162 ms162 ms162 ms
Max Potential FID139 ms139 ms139 ms139 ms
CPU long tasks 6666
CPU last long task happens at1.678 s1.678 s1.678 s1.678 s

More metrics

min · median · mean · max of 1 run
MetricMinMedianMeanMax
First paint1.044 s1.044 s1.044 s1.044 s
Load event end796 ms796 ms796 ms796 ms

Waterfall

Run 1 SpeedIndex median

First paintFCPLCPDOMContentLoadedDOM interactiveLoadRender-blockingRedirectError

Rendering

Run 1 · median
0.000 s
0s1s2s3s4s

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

34 frames

Use --filmstrip.showAll to show all filmstrips.

Frame at 0 ms
0 ms
0 %
Frame at 400 ms
400 ms
80 %
Frame at 500 ms
500 ms
80 %
Frame at 600 ms
600 ms
80 %
Frame at 700 ms
700 ms
80 %
Frame at 800 ms
800 ms
80 %
Frame at 900 ms
900 ms
80 %
Frame at 1.000 s
1.000 s
80 %
Frame at 1.100 s
1.100 s
22 %
Frame at 1.200 s
1.200 s
22 %
Frame at 1.300 s
1.300 s
22 %
Frame at 1.400 s
1.400 s
22 %
Frame at 1.500 s
1.500 s
22 %
Frame at 1.600 s
1.600 s
22 %
Frame at 1.700 s
1.700 s
21 %
Frame at 1.800 s
1.800 s
21 %
Frame at 1.900 s
1.900 s
22 %
Frame at 2.000 s
2.000 s
22 %
Frame at 2.100 s
2.100 s
22 %
Frame at 2.200 s
2.200 s
22 %
Frame at 2.300 s
2.300 s
22 %
Frame at 2.400 s
2.400 s
90 %
Frame at 2.500 s
2.500 s
94 %
Frame at 2.600 s
2.600 s
98 %
Frame at 2.700 s
2.700 s
98 %
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
99 %
Frame at 4.700 s
4.700 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 1.044 s on a 157 ms first byte; the 2 render-blocking requests were done by 236 ms and the remaining ~808 ms is style and layout work. The largest paint followed at 2.364 s.

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 · 76.7 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 157 ms
575 ms
23.7 KB574 ms
css · xelta.ai
50 ms
75.6 KB50 ms
css · xelta.ai
47 ms
1.1 KB47 ms
LCP resource
1785746756636-303b2e9936474ce2.webp — downloaded by 2.301 s, rendered at 2.364 s
51 ms
21.7 KB51 ms
web font · xelta.ai
36 ms
47.7 KB36 ms
0591 ms1.773 sFCP 1.044 sLCP 2.364 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.

What to fix first

Performance advice

82
2 errors7 warnings3 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 6 CPU long tasks with the total of 618 ms. The total blocking time is 162 ms and 2 long tasks before first contentful paint with total time of 256 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
  • self
  • self
  • self
  • self
  • self
warn(0)Avoid extra requests by setting cache headerscacheHeaders

The page has 21 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 19.9 kB the next access.

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

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

The total JavaScript transfer size is 1.2 MB and the uncompressed size is 4 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-CPG3NLBKHP182.9 KB551.9 KB
https://xelta.ai/_next/static/chunks/0m3mx3i-m~688.js4.7 KB15.1 KB
https://xelta.ai/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js4.4 KB12.0 KB
https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e178179150949611.3 KB30.9 KB
https://xelta.ai/_next/static/chunks/03ox.1guh6ztx.js11.4 KB34.7 KB
https://xelta.ai/_next/static/chunks/0_rplde-.zqb4.js15.4 KB50.2 KB
https://xelta.ai/_next/static/chunks/0-3hg5vr2eqt-.js56.4 KB240.0 KB
https://xelta.ai/_next/static/chunks/08awojht0q7q1.js9.5 KB28.2 KB
https://xelta.ai/_next/static/chunks/0g-1d0hohb9w6.js8.9 KB33.9 KB
https://xelta.ai/_next/static/chunks/05i2m8ow2izxn.js9.7 KB32.3 KB
https://xelta.ai/_next/static/chunks/018e-dq7n7_9a.js1.9 KB2.7 KB
https://xelta.ai/_next/static/chunks/14qqa_mk35dsf.js28.7 KB84.4 KB
https://xelta.ai/_next/static/chunks/0_6_lfc5zz-bv.js16.7 KB65.7 KB
https://xelta.ai/_next/static/chunks/026wu3uvh-5u1.js14.9 KB44.3 KB
https://xelta.ai/_next/static/chunks/0yzxh~6j4hotj.js13.4 KB37.4 KB
https://xelta.ai/_next/static/chunks/02fvhu.~ed9tm.js43.6 KB140.7 KB
https://xelta.ai/_next/static/chunks/150ht8n--uthk.js9.2 KB31.3 KB
https://xelta.ai/_next/static/chunks/0fg44qzichqiw.js42.0 KB142.6 KB
https://xelta.ai/_next/static/chunks/08vhp3.h~c4ew.js17.2 KB58.1 KB
https://xelta.ai/_next/static/chunks/06e425a78ll4h.js19.4 KB62.0 KB
https://xelta.ai/_next/static/chunks/0kc5itym_8jof.js15.8 KB63.5 KB
https://xelta.ai/_next/static/chunks/045cmzqi3nit4.js11.2 KB32.1 KB
https://xelta.ai/_next/static/chunks/13ee4mpgt8ag..js9.9 KB25.7 KB
https://xelta.ai/_next/static/chunks/0fb..7m5fmuc_.js10.0 KB27.9 KB
https://xelta.ai/_next/static/chunks/0968~ir0sl3wz.js7.5 KB19.9 KB
https://xelta.ai/_next/static/chunks/144c003qaudkf.js10.7 KB37.2 KB
https://xelta.ai/_next/static/chunks/0.4x.j3tu010_.js7.7 KB21.3 KB
https://xelta.ai/_next/static/chunks/0zqqteuv74m7v.js10.8 KB29.0 KB
https://xelta.ai/_next/static/chunks/04jewicli5sb-.js7.7 KB31.6 KB
https://xelta.ai/_next/static/chunks/turbopack-0jzzy4e.3k957.js6.6 KB19.5 KB
https://xelta.ai/_next/static/chunks/15_v~jewnj0mv.js10.2 KB45.5 KB
https://xelta.ai/_next/static/chunks/0y0ijhqmszjlv.js70.7 KB225.2 KB
https://xelta.ai/_next/static/chunks/0vh93s1co9ess.js41.7 KB148.7 KB
https://xelta.ai/_next/static/chunks/0n4uu.1gj6b8q.js13.6 KB41.9 KB
https://connect.facebook.net/en_US/fbevents.js108.8 KB400.0 KB
https://xelta.ai/_next/static/chunks/0kxf62rafcfu6.js84.8 KB279.9 KB
https://xelta.ai/_next/static/chunks/0y1.630u7j4dm.js2.0 KB2.9 KB
https://us-assets.i.posthog.com/array/phc_tafs3TRoGdYdr8ar4Qrx2YD5kXgsSTDNWbMHDwMSwRno/config.js813 B794 B
https://connect.facebook.net/signals/config/1941936199799107.../194193619979910765.8 KB273.1 KB
https://us-assets.i.posthog.com/static/1.417.1/surveys.js33.3 KB97.6 KB
https://xelta.ai/_next/static/chunks/0npi32wfhr7ks.js10.3 KB36.4 KB
https://xelta.ai/_next/static/chunks/0.xma1o0r_dkq.js5.7 KB16.1 KB
https://xelta.ai/_next/static/chunks/1336iqomovzyw.js1.1 KB735 B
https://xelta.ai/_next/static/chunks/0a41ov9xoezkw.js2.9 KB6.2 KB
https://xelta.ai/_next/static/chunks/0oyzftal04ylp.js35.5 KB108.7 KB
https://xelta.ai/_next/static/chunks/0mv-vg~s9cqi5.js10.7 KB32.7 KB
https://xelta.ai/_next/static/chunks/0t~dpv9j7jqud.js46.9 KB207.4 KB
warn(50)Total CSS size shouldn't be too bigcssSize

The total CSS transfer size is 78.5 kB and uncompressed size is 591.6 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/0~ln47gr7hh9d.css75.6 KB575.7 KB
https://xelta.ai/_next/static/chunks/08ak-dq81l91~.css1.1 KB2.0 KB
infoThe favicon should be small and cacheablefavicon

The favicon size is 663.8 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
error(70)Avoid missing and error requestsresponseOk

The page has 3 error responses. The page has 1 response with code 401. The page has 2 responses with code 404.

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
infoLong cache headers is goodcacheHeadersLong

The page has 22 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(80)Don't use private headers on static contentprivateAssets

The page has 3 requests with private headers. The main page has a private header. It could be right in some cases where the user can be logged in and served specific content. But if your asset is static it should never be private. 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(85)Avoid using incorrect mime typesmimeTypes
infoMake each CSS response smalloptimalCssSize

https://xelta.ai/_next/static/chunks/0~ln47gr7hh9d.css size is 77.4 kB (77426) 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/0~ln47gr7hh9d.css75.6 KB575.7 KB
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.

Best practice advice

74
1 error1 warning2 info
error(0)Cumulative Layout ShiftcumulativeLayoutShift

You have a poor cumulative layout shift score (0.4622). It is in the Google Web Vitals poor range, with a shift higher than 0.25. You should manually check the filmstrip or video and check if it will affect the user.

Cumulative Layout Shift measures the sum total of all individual layout shift scores for unexpected layout shift that occur. The metric is measuring visual stability by quantify how often users experience unexpected layout shifts. It is one of Google Web Vitals.

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 3 responses that sets a pragma no-cache header (that is a request header). There are 91 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 15% requests to third party domains (14 requests and 415.5 kB). First party is 82 requests and 1.9 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://xelta.ai/_ne...ta.ai/_next/image has a header report-to that is 605 characters long. https://xelta.ai/cdn-cgi/rum? has a header report-to that is 609 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. https://xelta.ai/flo...flow/promo-teaser has a header report-to that is 605 characters long. https://media.xelta....2e9936474ce2.webp has a header report-to that is 622 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 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
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 380.3 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 6 survelliance requests and uses 5 survelliance tools. The page do 6 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 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 Fast - AI ModelThe document title, shown in the browser tab and used by search results.
Layout viewport1398 × 1606 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 elements1,026Large, watch layout costTotal HTML elements. Fewer means less for the browser to style, lay out and paint.
Avg DOM depth11How deeply elements are nested on average.
Max DOM depth16The deepest nesting on the page. Deep branches cost more style recalculation.
Iframes0No embedded documents on this page.
Script tags78Number 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 storage1.2 KBData the page saved in localStorage, kept across visits.
Session storage569 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

10 technologies

Third-party tools

17 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
Other
  • Amazon Web Services
Analytics
  • Google Analytics
Ad
  • Google/Doubleclick Ads

Data from run 1

Visual Metrics

Visual milestones

all times from navigation start
Speed Index1.50 show quickly the page looked done
First Visual Change0.34 sfirst paint reaches the screen
Last Visual Change4.62 sscreen stops changing · 4.28 s after first
≥99%
0.34 sFirst Visual Change
2.33 sVisual Complete 85%
2.53 sVisual Complete 95%
2.73 sVisual Complete 99%
Last Visual Change4.62 s
Visual Readiness4.28 s· first to last change
01.0 s2.0 s3.0 s4.0 s
Content milestones
Perception index
Visual progress
Visual progress at 0 s0.0s
Visual progress at 0.8 s0.8s
Visual progress at 1.2 s1.2s
Visual progress at 1.7 s1.7s
Visual progress at 2.2 s2.2s
Visual progress at 2.7 s2.7s
Visual progress at 3.1 s3.1s
Visual progress at 4.7 s4.7s
FCP1.04s
LCP2.36s
VC852.33s
Long tasks
0.0s0.9s1.9s2.8s3.8s4.7s

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.

2.364 sLCP render time

Phase breakdown

  • TTFB157 ms
  • Resource load delay2.100 s
  • Resource load duration52 ms
  • Element render delay55 ms

Element

Element type
<div>
Size (w × h)
49165
URL
https://media.xelta....2e9936474ce2.webp
Load time
2.312 s

DOM path

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

0.462cumulative 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.

  • #10.424<div class="min-h-screen bg-black flex items-center justify-center"></div>,<div class="text-center"></div>
    body > div#app-root > div:eq(2),body > div#app-root > div:eq(2) > div
  • #20.016<div class="min-h-screen bg-black flex items-center justify-center"></div>
    body > div#app-root > div:eq(2)
  • #30.007<div class="min-h-screen bg-black flex items-center justify-center"></div>
    body > div#app-root > div:eq(2)
  • #40.004<div class="min-h-screen bg-black flex items-center justify-center"></div>
    body > div#app-root > div:eq(2)
  • #50.004<div class="min-h-screen bg-black flex items-center justify-center"></div>
    body > div#app-root > div:eq(2)
  • #60.004<div class="min-h-screen bg-black flex items-center justify-center"></div>
    body > div#app-root > div:eq(2)
  • #70.003<div class="min-h-screen bg-black flex items-center justify-center"></div>
    body > div#app-root > 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 msMISS
cfEdge35 ms–
cfOrigin63 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 versionHTTP/2.0
Total requests96
Total domains14
Transfer size2.3 MB
Content size5.6 MB
Missing compression0
Cookies50 third-party

Main document

status 200 · 0 redirects

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

HeaderValue
alt-svch3=":443"; ma=86400
cache-controlprivate, max-age=604800, must-revalidate
cf-cache-statusMISS
cf-raya2daf296ad918adb-DEL
content-encodingbr
content-typetext/html; charset=utf-8
dateWed, 19 Aug 2026 17:41:10 GMT
expect-ctmax-age=86400, enforce
last-modifiedWed, 19 Aug 2026 17:41:10 GMT
link</_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2>; rel=preload; as="font"; crossorigin=""; type="font/woff2"
nel{"report_to":"cf-nel","success_fraction":0.0,"max_age":604800}
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=02jYm%2FIeyMrE%2Fl%2BzFpF3zDTWNtPogUtueyFxwf3JXfWBjvqlpZMxFUZNNF5hI%2FSbM43IYF5HjIiEk1XyKGCXlcPPDtAj2jIamU30Z%2F2y%2FNqHf4et%2FXM%2Fsu5K"}]}
servercloudflare
server-timingcfCacheStatus;desc="MISS" cfEdge;dur=35,cfOrigin;dur=63
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-xss-protection1; mode=block

Response codes

200
8689.6%
202
11.0%
204
66.3%
401
11.0%
404
22.1%

Largest assets on the page (by transfer size)

Top 20 of 96

Requests and sizes per content type

9 types

Transfer size2.3 MB

  • javascript50.5%
  • favicon28.1%
  • image14.2%
  • css3.3%
  • font2.1%
  • html1.0%
  • other0.52%
  • json0.15%
  • plain0.10%

Content size5.6 MB

  • javascript68.4%
  • favicon11.6%
  • css10.1%
  • image5.5%
  • html3.0%
  • font0.82%
  • other0.54%
  • json0.03%
  • plain0.00%

Requests93

  • javascript50.5%
  • other18.3%
  • image16.1%
  • plain5.4%
  • json4.3%
  • css2.2%
  • html1.1%
  • font1.1%
  • favicon1.1%
ContentHeader SizeTransfer SizeContent SizeRequests
html0 b23.7 KB170.2 KB1
css0 b76.7 KB577.7 KB2
javascript0 b1.1 MB3.8 MB47
image0 b327.6 KB315.5 KB15
font0 b47.7 KB47.3 KB1
favicon0 b648.2 KB668.8 KB1
other0 b12.0 KB30.8 KB17
plain0 b2.3 KB2 B5
json0 b3.3 KB1.5 KB4
Total0 b2.3 MB5.6 MB93

Data per domain

14 domains
DomainTotal download timeTransfer SizeContent SizeRequests
xelta.ai11.359 s1.8 MB4.3 MB76
www.googletagmanager.com346 ms182.9 KB551.9 KB1
static.cloudflareinsights.com158 ms11.3 KB30.9 KB1
connect.facebook.net133 ms174.6 KB673.2 KB2
seob.xelta.ai716 ms244 B28 B1
vygxif9kfe.execute-api.ap-south-1.amazonaws.com234 ms1.6 KB100 B3
analytics.google.com166 msN/A0 b1
stats.g.doubleclick.net132 ms553 B0 b1
www.google.co.in120 ms408 B42 B1
us-assets.i.posthog.com77 ms34.1 KB98.4 KB2
cms-b.xelta.ai204 ms1.6 KB69 B2
pmt.xelta.ai1.025 s850 B1.3 KB2
media.xelta.ai67 ms21.7 KB20.1 KB1
telemetry.matchbestsoftware.online152 ms286 B2 B2

Expires & last-modified statistics

typeminmedianmax
Expires0 seconds1 week1 year
Last modified0 seconds9 hours9 weeks

Requests loaded after onLoad event

56 requests

Includes requests done after load event end.

ContentTransfer SizeRequests
html0 b0
css0 b0
javascript408.6 KB13
image326.1 KB14
font0 b0
favicon648.2 KB1
plain2.3 KB5
other11.6 KB16
json3.3 KB4
Total1.4 MB56

Requests loaded after onContentLoad

56 requests

Includes requests done after DOM content loaded.

ContentTransfer SizeRequests
html0 b0
css0 b0
javascript408.6 KB13
image326.1 KB14
font0 b0
favicon648.2 KB1
plain2.3 KB5
other11.6 KB16
json3.3 KB4
Total1.4 MB56

CPU

https://www.googletagmanager.com/gtag/js?id=G-CPG3NLBKHP is responsible for 39% of blocking time
92 ms of 234 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.

TBT162 ms
Max potential input delay139 ms
Total long tasks6
Total time618 ms
Last task at1.678 s
Before first paint256 ms2 tasks
Before FCP256 ms2 tasks
Before LCP618 ms6 tasks
After load618 ms6 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 frames12showing the 10 with the most blocking time
Blocking time404.6 msacross all long frames — what hurts INP and TBT
Blocking before LCP404.6 msdelaying the largest paint — fix these first
Blocking after load275 msafter the load event — didn't delay page load

What to fix first

ScriptFramesTime runningBlocking (share by run time)Forced style & layoutTriggered by
js3rd party2192.7 ms92.4 ms–script tag, timer or animation callback
fbevents.js3rd party1113.9 ms64 ms–script tag
0y0ijhqmszjlv.js2111.1 ms43.2 ms–script tag, event handler
rocket-loader.min.js117 ms17 ms–event handler
v4513226cdae34746b4dedf0b4dfa099e17817915094963rd party111.9 ms11.9 ms–module script
0kxf62rafcfu6.js154.9 ms5.7 ms–script tag

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

Long animation frame #1 · 179.7 msat 765.1 ms · before LCP
blocking 129.6 ms
  • Scripts & other work32.4 ms
  • Animation callbacks3.2 ms
  • Style & layout144.1 ms
  • Render0 ms
2 scripts ran during this frame
Ran for
11.9 ms
How it started
module script
Ran for
17 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)
Long animation frame #2 · 139.1 msat 1.272 s · before LCP
blocking 89.1 ms
  • Scripts & other work139.1 ms
  • Animation callbacks0 ms
  • Style & layout0 ms
  • Render0 ms
1 script ran during this frame
js3rd party
Ran for
138.6 ms
How it started
script tag
Long animation frame #3 · 114.2 msat 1.678 s · before LCP
blocking 64.2 ms
  • Scripts & other work114.2 ms
  • Animation callbacks0 ms
  • Style & layout0 ms
  • Render0 ms
1 script ran during this frame
fbevents.js3rd party
Ran for
113.9 ms
How it started
script tag
Long animation frame #4 · 136.1 msat 983.2 ms · before LCP
blocking 55.8 ms
  • Scripts & other work134.9 ms
  • Animation callbacks0 ms
  • Style & layout1.2 ms
  • Render0 ms
1 script ran during this frame
Ran for
103.1 ms
How it started
script tag
Long animation frame #5 · 84.9 msat 1.793 s · before LCP
blocking 34.9 ms
  • Scripts & other work84.9 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 · 118.7 msat 1.539 s · before LCP
blocking 12.3 ms
  • Scripts & other work118.3 ms
  • Animation callbacks0 ms
  • Style & layout0.4 ms
  • Render0 ms
1 script ran during this frame
Ran for
54.9 ms
How it started
script tag
Long animation frame #7 · 61.7 msat 1.937 s · before LCP
blocking 11.6 ms
  • Scripts & other work61.7 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 #8 · 65.9 msat 1.467 s · before LCP
blocking 4.4 ms
  • Scripts & other work65.5 ms
  • Animation callbacks0.1 ms
  • Style & layout0.3 ms
  • Render0 ms
2 scripts ran during this frame
Ran for
8 ms
Started by
MessagePort.onmessage
How it started
event handler
Source function
z
Position in source
character 7855 into the file (locate it via DevTools → Performance → the Long Animation Frames track)
js3rd party
Ran for
54.1 ms
Started by
TimerHandler:setTimeout
How it started
timer or animation callback
Long animation frame #9 · 52.7 msat 1.414 s · before LCP
blocking 2.7 ms
  • Scripts & other work52.7 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.

1 more long frame carried no blocking time (nothing ran past the 50 ms threshold) — long, but harmless to INP and TBT.

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 requests16
Tools7
Categories7

Categories

7 categories

Requests by category16

  • survelliance6 req · 5 tools37.5%
  • other3 req · 1 tool18.8%
  • utility2 req · 2 tools12.5%
  • social2 req · 1 tool12.5%
  • tag-manager1 req · 1 tool6.3%
  • analytics1 req · 1 tool6.3%
  • ad1 req · 1 tool6.3%

Third party requests and tools

7 categories
tag-managerGoogle Tag Manager1 requests · 1 tool
survellianceGoogle Tag ManagerFacebookGoogle Analytics+ 2 more6 requests · 5 tools
utilityCloudflareOther Google APIs/SDKs2 requests · 2 tools
socialFacebook2 requests · 1 tool
otherAmazon Web Services3 requests · 1 tool
analyticsGoogle Analytics1 requests · 1 tool
adGoogle/Doubleclick Ads1 requests · 1 tool

Unmatched third party domains

2 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

First party vs third party

82 first · 14 third party

Transfer size2.3 MB

  • First party1.9 MB82.4%
  • Third party405.7 KB17.6%

Content size5.6 MB

  • First party4.3 MB76.4%
  • Third party1.3 MB23.6%

Requests96

  • First party8285.4%
  • Third party1414.6%

First party requests and sizes per content type

82 requests

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

ContentHeader SizeTransfer SizeContent SizeRequests
html0 b23.7 KB170.2 KB1
css0 b76.7 KB577.7 KB2
javascript0 b761.2 KB2.5 MB41
image0 b327.2 KB315.5 KB14
font0 b47.7 KB47.3 KB1
favicon0 b648.2 KB668.8 KB1
other0 b12.0 KB30.8 KB16
plain0 b1.5 KB0 b1
json0 b3.3 KB1.5 KB4
TotalN/A1.9 MB4.3 MB82

Third party requests and sizes per content type

14 requests
ContentHeader SizeTransfer SizeContent SizeRequests
html0 b0 b0 b0
css0 b0 b0 b0
javascript0 b402.9 KB1.3 MB6
image0 b408 B42 B1
font0 b0 b0 b0
favicon0 b0 b0 b0
other0 b0 b0 b1
plain0 b839 B2 B4
TotalN/A405.7 KB1.3 MB14