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Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
7
PASS
12
INFO
3

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
32
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
80
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

4.99 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

14.10 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

1.89 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

6.63 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

14.10 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
26
12 PASS 7 REVIEW 4 FIX
D
Third-Party Impact
Action
67% third-party, 0 ms blocking
FIX
67% third-party, 0 ms blocking
Warning::
Third-party code accounts for 67% of page weight (1.1 MiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
33%
67%
First-party Third-party
F
JS Execution Cost
Action
5118ms total JS execution
FIX
5118ms total JS execution
Warning::
Unattributable: 833ms CPU time
Warning::
https://stackoverflow.com/users/login: 472ms CPU time
Warning::
https://stackoverflow.com/Content/Js/islands/homep...: 450ms CPU time
Warning::
https://stackoverflow.com/cdn-cgi/challenge-platfo...: 374ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-WCZ0...: 357ms CPU time
Warning::
Third-party scripts: 3197ms (62% of total)

Main Thread Breakdown

Script Evaluation 60% Script Parsing & Compilation 12% Other 12% Style & Layout 9% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable833ms190ms0ms3rd
https://stackoverflow.com/users/login472ms86ms20ms1st
https://stackoverflow.com/Content/Js/islands/homepage-wizard.en.js?v=a74b3480697c450ms341ms6ms1st
https://stackoverflow.com/cdn-cgi/challenge-platform/scripts/jsd/main.js374ms339ms3ms1st
https://www.googletagmanager.com/gtag/js?id=G-WCZ03SZFCQ357ms291ms63ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202605010101/pubads_impl.js?cb=31098254286ms192ms79ms3rd
https://dn0qt3r0xannq.cloudfront.net/stackoverflow-M6HzSe6yue/mapping.base/prebid-wrapper.js286ms158ms38ms3rd
https://edge.aditude.io/prebid/9.30.0.js?fork=1&v=6167788a58e716d678c6d136265c856c&modules=WyIzM2Fjcm9zc0lkU3lzdGVtIiwiYWRpdHVkZSIsImFsbG93QWN0aXZpdGllcyIsImFwcG5leHVzQmlkQWRhcHRlciIsImNvbnNlbnRNYW5hZ2VtZW50IiwiY29uc2VudE1hbmFnZW1lbnRHcHAiLCJjb25zZW50TWFuYWdlbWVudFVzcCIsImNvbnZlcnNhbnRCaWRBZGFwdGVyIiwiY3JpdGVvSWRTeXN0ZW0iLCJlcXVhdGl2QmlkQWRhcHRlciIsImZhYnJpY2tJZFN5c3RlbSIsImdkcHJFbmZvcmNlbWVudCIsImdwdFByZUF1Y3Rpb24iLCJpZDVJZFN5c3RlbSIsIml4QmlkQWRhcHRlciIsImthcmdvQmlkQWRhcHRlciIsIm1lZGlhbmV0QmlkQWRhcHRlciIsIm9wZW54QmlkQWRhcHRlciIsInByZWJpZFNlcnZlckJpZEFkYXB0ZXIiLCJwcmljZUZsb29ycyIsInB1YlByb3ZpZGVkSWRTeXN0ZW0iLCJwdWJtYXRpY0JpZEFkYXB0ZXIiLCJydWJpY29uQmlkQWRhcHRlciIsInNoYXJlZElkU3lzdGVtIiwic2hhcmV0aHJvdWdoQmlkQWRhcHRlciIsInRyaXBsZWxpZnRCaWRBZGFwdGVyIiwidHRkQmlkQWRhcHRlciIsInVuaWZpZWRJZFN5c3RlbSJd279ms221ms56ms3rd
https://raven-static.aditude.io/prod/1.20.0-69wxiu/raven.js242ms173ms68ms3rd
https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js197ms93ms70ms3rd

Showing top 10 of 23 scripts

F
JS Bundles
Action
47 scripts, 695 KB unused
FIX
47 scripts, 695 KB unused
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 141 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://stackoverflow.com/Content/Js/full-anon.en....: 95 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://edge.aditude.io/prebid/9.30.0.js?fork=1&v=...: 94 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202603.1...: 79 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 72 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 695 KB
695 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202605010101/pubads_impl.js?cb=31098254189 KB141 KB (75%)✓3rd
https://stackoverflow.com/Content/Js/full-anon.en.js?v=1184f324f5d2129 KB95 KB (74%)✓1st
https://edge.aditude.io/prebid/9.30.0.js?fork=1&v=6167788a58e716d678c6d136265c856c&modules=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 KB94 KB (69%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js130 KB79 KB (61%)✓3rd
https://accounts.google.com/gsi/client96 KB72 KB (75%)✓3rd
https://raven-static.aditude.io/prod/1.20.0-69wxiu/raven.js106 KB63 KB (59%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-WCZ03SZFCQ155 KB62 KB (40%)✓3rd
https://dn0qt3r0xannq.cloudfront.net/stackoverflow-M6HzSe6yue/mapping.base/prebid-wrapper.js81 KB37 KB (45%)✓3rd
https://stackoverflow.com/Content/Js/webpack-chunks/svelte.en.js?v=f773033c4e0b32 KB32 KB (99%)✓1st
https://stackoverflow.com/Content/Js/third-party/npm/@stackoverflow/stacks/dist/js/stacks.min.js?v=c7bcc7a1b4fd30 KB21 KB (69%)✓1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
Page Weight Inventory
Action
79 resources · 1.6 MB · 695 KB savings available
FIX
79 resources · 1.6 MB · 695 KB savings available
Warning::
Page weight 1.6 MB exceeds 1 MB target by 636 KB
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~695 KB of savings available
Warning::
47 third-party resources (67% of weight)
79 resources · 1.6 MiB · 47 third-party 635.9 KiB over 1MB target
JavaScript 80% · 1.3 MiB
CSS 13% · 212.1 KiB
Other 5% · 83.3 KiB
Document 2% · 35.2 KiB
Image 0% · 2.1 KiB

~695.0 KiB of savings available

Remove unused JavaScript: 695.0 KiB
C
Page Weight Budget
Action
1.6 MB transferred, 79 requests
REVIEW
1.6 MB transferred, 79 requests
Info::
Page weighs 6.2 MB (1.6 MB transferred)
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Info::
CSS is 207 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 207 KB
Info::
79 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
79 requests
0.34 g CO2 per page load
JavaScript 1.3 MiB 80%
CSS 207.4 KiB 12%
Other 60.0 KiB 4%
HTML 35.2 KiB 2%
Other 25.0 KiB 2%
Other 3.6 KiB 0%
Images 1.4 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Main HTML Cache-Control
Cache-Control present but without max-age
REVIEW
Cache-Control present but without max-age
Info::
Main HTML Cache-Control has no max-age: private
Got: private
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
B
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
1 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
Warning::
Total JS execution time is 5.1 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
B
HTTP Caching
private
REVIEW
private
Info::
Cache-Control header is set
Got: private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A
Image Optimization
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 1 KB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
79 requests over 3556ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 5.0 s LCP 14.1 shttps://stackoverflow.com/users/login/users/login https://stackoverflow.com/users/login — 200 — 35.2 KiB — 383 ms — h2https://cdn.cookielaw.org/scripttemplates/gpp.stub.jscdn.cookielaw.org/scripttemplates/g... https://cdn.cookielaw.org/scripttemplates/gpp.stub.js — 200 — 2.1 KiB — 29 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 8.9 KiB — 30 ms — h2https://stackoverflow.com/Content/Js/google-analytics.en.js?v=48615a9a9bc4/Content/Js/google-analytics.en.js?... https://stackoverflow.com/Content/Js/google-analytics.en.js?v=48615a9a9bc4 — 200 — 2.4 KiB — 49 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js — 200 — 30.4 KiB — 20 ms — h2https://stackoverflow.com/Content/Js/stub.en.js?v=b6c076cce061/Content/Js/stub.en.js?v=b6c076cce0... https://stackoverflow.com/Content/Js/stub.en.js?v=b6c076cce061 — 200 — 18.1 KiB — 48 ms — h2https://stackoverflow.com/Content/Shared/stacks.css?v=b2264ccf0463/Content/Shared/stacks.css?v=b2264c... https://stackoverflow.com/Content/Shared/stacks.css?v=b2264ccf0463 — 200 — 110.2 KiB — 45 ms — h2https://stackoverflow.com/Content/Sites/stackoverflow/primary.css?v=880dfade9e7f/Content/Sites/stackoverflow/primar... https://stackoverflow.com/Content/Sites/stackoverflow/primary.css?v=880dfade9e7f — 200 — 74.3 KiB — 51 ms — h2https://stackoverflow.com/Content/Sites/stackoverflow/secondary.css?v=2a409df786e1/Content/Sites/stackoverflow/second... https://stackoverflow.com/Content/Sites/stackoverflow/secondary.css?v=2a409df786e1 — 200 — 17.5 KiB — 47 ms — h2https://stackoverflow.com/Content/Js/auth.en.js?v=4ab5d8f5659f/Content/Js/auth.en.js?v=4ab5d8f565... https://stackoverflow.com/Content/Js/auth.en.js?v=4ab5d8f5659f — 200 — 3.5 KiB — 46 ms — h2https://stackoverflow.com/Content/Shared/Channels/channels.css?v=d431b1be5a03/Content/Shared/Channels/channels.c... https://stackoverflow.com/Content/Shared/Channels/channels.css?v=d431b1be5a03 — 200 — 4.7 KiB — 28 ms — h2https://stackoverflow.com/px.js?ch=1/px.js?ch=1 https://stackoverflow.com/px.js?ch=1 — 200 — 540 B — 250 ms — h2https://stackoverflow.com/px.js?ch=2/px.js?ch=2 https://stackoverflow.com/px.js?ch=2 — 200 — 361 B — 251 ms — h2https://cdn.cookielaw.org/consent/c3d9f1e3-55f3-4eba-b268-46cee4c6789c/c3d9f1e3-55f3-4eba-b268-46cee4c6789c.jsoncdn.cookielaw.org/consent/c3d9f1e3-... https://cdn.cookielaw.org/consent/c3d9f1e3-55f3-4eba-b268-46cee4c6789c/c3d9f1e3-55f3-4eba-b268-46cee4c6789c.json — 200 — 2.6 KiB — 29 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 273 B — 45 ms — h2https://stackoverflow.com/Content/Js/third-party/npm/@stackoverflow/stacks/dist/js/stacks.min.js?v=c7bcc7a1b4fd/Content/Js/third-party/npm/@stacko... https://stackoverflow.com/Content/Js/third-party/npm/@stackoverflow/stacks/dist/js/stacks.min.js?v=c7bcc7a1b4fd — 200 — 30.5 KiB — 34 ms — h2https://stackoverflow.com/Content/Js/sprinkles/cookie-consent.en.js?v=7ee6963139c5/Content/Js/sprinkles/cookie-consen... https://stackoverflow.com/Content/Js/sprinkles/cookie-consent.en.js?v=7ee6963139c5 — 200 — 912 B — 24 ms — h2https://stackoverflow.com/Content/Js/webpack-chunks/svelte.en.js?v=f773033c4e0b/Content/Js/webpack-chunks/svelte.e... https://stackoverflow.com/Content/Js/webpack-chunks/svelte.en.js?v=f773033c4e0b — 200 — 32.3 KiB — 42 ms — h2https://stackoverflow.com/Content/Js/webpack-chunks/stacks-svelte.en.js?v=297d3b9a88f6/Content/Js/webpack-chunks/stacks-s... https://stackoverflow.com/Content/Js/webpack-chunks/stacks-svelte.en.js?v=297d3b9a88f6 — 200 — 12.9 KiB — 45 ms — h2https://stackoverflow.com/Content/Js/webpack-chunks/9366.en.js?v=c8d4e4e64bf3/Content/Js/webpack-chunks/9366.en.... https://stackoverflow.com/Content/Js/webpack-chunks/9366.en.js?v=c8d4e4e64bf3 — 200 — 8.4 KiB — 32 ms — h2https://stackoverflow.com/Content/Js/islands/signup-modal.en.js?v=f64ec881ea96/Content/Js/islands/signup-modal.en... https://stackoverflow.com/Content/Js/islands/signup-modal.en.js?v=f64ec881ea96 — 200 — 8.4 KiB — 33 ms — h2https://stackoverflow.com/Content/Js/islands/one-tap.en.js?v=102f0378a2cf/Content/Js/islands/one-tap.en.js?v... https://stackoverflow.com/Content/Js/islands/one-tap.en.js?v=102f0378a2cf — 200 — 1.7 KiB — 51 ms — h2https://stackoverflow.com/Content/Js/sprinkles/left-nav-events.en.js?v=2ac13fd60bf6/Content/Js/sprinkles/left-nav-even... https://stackoverflow.com/Content/Js/sprinkles/left-nav-events.en.js?v=2ac13fd60bf6 — 200 — 1.1 KiB — 46 ms — 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h3https://dn0qt3r0xannq.cloudfront.net/components/throttle-refresh-component.df2a65d370ca58b8e694.jsdn0qt3r0xannq.cloudfront.net/compon... https://dn0qt3r0xannq.cloudfront.net/components/throttle-refresh-component.df2a65d370ca58b8e694.js — 200 — 1.6 KiB — 14 ms — h3https://dn0qt3r0xannq.cloudfront.net/components/creative-timed-refresh-component.fadfb23da89a749613a5.jsdn0qt3r0xannq.cloudfront.net/compon... https://dn0qt3r0xannq.cloudfront.net/components/creative-timed-refresh-component.fadfb23da89a749613a5.js — 200 — 4.1 KiB — 13 ms — h3https://raven-edge.aditude.io/api/v1/ravenconfig?ppid=stackoverflow-main-I67Hg&geo=SGraven-edge.aditude.io/api/v1/ravenc... https://raven-edge.aditude.io/api/v1/ravenconfig?ppid=stackoverflow-main-I67Hg&geo=SG — 200 — 979 B — 22 ms — h2https://dn0qt3r0xannq.cloudfront.net/components/first-party-data-component.f1108ab1a9f5c1ca41bd.jsdn0qt3r0xannq.cloudfront.net/compon... https://dn0qt3r0xannq.cloudfront.net/components/first-party-data-component.f1108ab1a9f5c1ca41bd.js — 200 — 2.9 KiB — 10 ms — h3https://dn0qt3r0xannq.cloudfront.net/components/refresh-all-ads-component.62632b58cc66eceb8c31.jsdn0qt3r0xannq.cloudfront.net/compon... https://dn0qt3r0xannq.cloudfront.net/components/refresh-all-ads-component.62632b58cc66eceb8c31.js — 200 — 1.4 KiB — 10 ms — h3https://dn0qt3r0xannq.cloudfront.net/components/taboola-auto-tagId-component.a50caf82ef8584ff2ef0.jsdn0qt3r0xannq.cloudfront.net/compon... https://dn0qt3r0xannq.cloudfront.net/components/taboola-auto-tagId-component.a50caf82ef8584ff2ef0.js — 200 — 1.1 KiB — 9 ms — h3https://lexicon.33across.com/v1/envelope?pid=0015a00002qqhgFAAQ&gdpr=0&src=pbjs&ver=9.30.0&coppa=0lexicon.33across.com/v1/envelope?pi... https://lexicon.33across.com/v1/envelope?pid=0015a00002qqhgFAAQ&gdpr=0&src=pbjs&ver=9.30.0&coppa=0 — 200 — 206 B — 733 ms — h2https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Fstackoverflow.com%2F&domain=stackoverflow.com&cw=1&lsw=1gum.criteo.com/sid/json?origin=preb... https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Fstackoverflow.com%2F&domain=stackoverflow.com&cw=1&lsw=1 — 200 — 0 B — 12 ms — h2https://id5-sync.com/api/config/prebidid5-sync.com/api/config/prebid https://id5-sync.com/api/config/prebid — 200 — 655 B — 474 ms — h2https://match.adsrvr.org/track/rid?ttd_pid=4fr687n&fmt=jsonmatch.adsrvr.org/track/rid?ttd_pid=... https://match.adsrvr.org/track/rid?ttd_pid=4fr687n&fmt=json — 200 — 574 B — 21 ms — h2https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Fstackoverflow.com%2F&domain=stackoverflow.com&cw=1&lsw=1gum.criteo.com/sid/json?origin=preb... https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Fstackoverflow.com%2F&domain=stackoverflow.com&cw=1&lsw=1 — 302 — 812 B — 26 ms — h2https://raven-static.aditude.io/prod/1.20.0-69wxiu/prebid-analytics.1d629f71b0308758a727.module.jsraven-static.aditude.io/prod/1.20.0... https://raven-static.aditude.io/prod/1.20.0-69wxiu/prebid-analytics.1d629f71b0308758a727.module.js — 200 — 5.6 KiB — 12 ms — h2https://raven-edge.aditude.io/api/v1/revenuesourcemaps/ebZqTKyz4DUJraven-edge.aditude.io/api/v1/revenu... https://raven-edge.aditude.io/api/v1/revenuesourcemaps/ebZqTKyz4DUJ — 200 — 1.1 KiB — 14 ms — h2https://mug.criteo.com/sid?cpp=K8Lw-nxoZ1YrSG11a0NFQWU1Y0dJdGpJVXRVOGNBSTNCOFdCZWlZZ3JYUjZQVUtVYmJoMkJBQUhRUVZCY3Y0WStKaXMrV251REFaNnVLMEg0QXlyVFNGeVl6VGw3MzBhSkcvSHptQU9pZGZkYUdORlA1Z2dGV0doSTloTGJza1hZeXNZTGpPVk4zYzAxTDQ2NGVUWGhGTGVsYWR5VEFrVkwwZUo4L1JCalBHVDlLVU9mTGdXTFRZU2FHNUoxK1ZvNlN3SXZOdVk3RW0vU1hnRCtwNXVibitJdnZQdVVSZkUwQjZCMXNiK0EwS0JvMTYvbTF6dzFLaGVUeWhuOTZ6cVNQZEF6fA&cppv=2mug.criteo.com/sid?cpp=K8Lw-nxoZ1Yr... 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h2https://securepubads.g.doubleclick.net/pagead/managed/dict/m202605070101/gptsecurepubads.g.doubleclick.net/page... https://securepubads.g.doubleclick.net/pagead/managed/dict/m202605070101/gpt — 200 — 23.1 KiB — 6 ms — h3https://id5-sync.com/g/v2/1016.jsonid5-sync.com/g/v2/1016.json https://id5-sync.com/g/v2/1016.json — 200 — 1.6 KiB — 158 ms — h2https://ams-pageview-public.s3.amazonaws.com/1x1-pixel.png?id=b1ffe3826ebcams-pageview-public.s3.amazonaws.co... https://ams-pageview-public.s3.amazonaws.com/1x1-pixel.png?id=b1ffe3826ebc — 200 — 448 B — 752 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
62% of JavaScript execution is third-party
First-party Third-party 3197ms · 961KB · $42/mo
Unattributable
Other
Costly
Execution 833ms
Transfer 0 KB
Monthly Cost $11/mo
Google Tag Manager
Tag Manager
Costly
Execution 357ms
Transfer 155 KB
Unused 40%
Monthly Cost $5/mo
securepubads.g.doubleclick.net
Other
Costly
Execution 286ms
Transfer 189 KB
Unused 75%
Monthly Cost $4/mo
dn0qt3r0xannq.cloudfront.net
Other
Costly
Execution 286ms
Transfer 81 KB
Unused 45%
Monthly Cost $4/mo
edge.aditude.io
Other
Costly
Execution 279ms
Transfer 137 KB
Unused 69%
Monthly Cost $4/mo
raven-static.aditude.io
Other
Costly
Execution 242ms
Transfer 106 KB
Unused 59%
Monthly Cost $3/mo
OneTrust
Consent
Essential
Execution 197ms
Transfer 130 KB
Unused 61%
Monthly Cost $3/mo
dn0qt3r0xannq.cloudfront.net
Other
Optional
Execution 186ms
Transfer 4 KB
Monthly Cost $2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 112ms
Transfer 0 KB
Monthly Cost $1/mo
ajax.googleapis.com
Other
Optional
Execution 82ms
Transfer 30 KB
Monthly Cost $1/mo
raven-static.aditude.io
Other
Optional
Execution 72ms
Transfer 6 KB
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 70ms
Transfer 2 KB
Monthly Cost $1/mo
dn0qt3r0xannq.cloudfront.net
Other
Optional
Execution 69ms
Transfer 17 KB
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 64ms
Transfer 9 KB
Monthly Cost $1/mo
accounts.google.com
Other
Optional
Execution 62ms
Transfer 96 KB
Unused 75%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 833ms and costs ~$11/month
  • Google Tag Manager adds 357ms and costs ~$5/month
  • securepubads.g.doubleclick.net adds 286ms and costs ~$4/month
  • dn0qt3r0xannq.cloudfront.net adds 286ms and costs ~$4/month
  • edge.aditude.io adds 279ms and costs ~$4/month
  • raven-static.aditude.io adds 242ms and costs ~$3/month

62% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 833ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 357ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

securepubads.g.doubleclick.net takes 286ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

75% of securepubads.g.doubleclick.net's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

dn0qt3r0xannq.cloudfront.net takes 286ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

edge.aditude.io takes 279ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

69% of edge.aditude.io's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

raven-static.aditude.io takes 242ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

59% of raven-static.aditude.io's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

61% of OneTrust's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

75% of accounts.google.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-04-10 — 2026-05-07)

LCP (p75)

1510 ms

88% good

INP (p75)

93 ms

92% good

CLS (p75)

0.000

99% good

FCP (p75)

1211 ms

TTFB (p75)

690 ms

This origin passes Core Web Vitals assessment
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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