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Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
4
REVIEW
6
PASS
12
INFO
3

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

Mobile Desktop
46
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
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.

4.85 s

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

11.76 s

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

655 ms

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.

4.93 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.

12.12 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
25
12 PASS 6 REVIEW 4 FIX
D
Third-Party Impact
Action
62% third-party, 0 ms blocking
FIX
62% third-party, 0 ms blocking
Warning::
Third-party code accounts for 62% of page weight (909.2 KiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
38%
62%
First-party Third-party
D
JS Execution Cost
Action
2536ms total JS execution
FIX
2536ms total JS execution
Warning::
Unattributable: 314ms CPU time
Warning::
https://stackoverflow.com/Content/Js/islands/homep...: 254ms CPU time
Info::
https://stackoverflow.com/cdn-cgi/challenge-platfo...: 236ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-WCZ0...: 227ms CPU time
Info::
https://stackoverflow.com/users/login: 206ms CPU time
Warning::
Third-party scripts: 1471ms (58% of total)

Main Thread Breakdown

Script Evaluation 65% Other 12% Script Parsing & Compilation 11% Style & Layout 8% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable314ms17ms0ms3rd
https://stackoverflow.com/Content/Js/islands/homepage-wizard.en.js?v=a74b3480697c254ms192ms3ms1st
https://stackoverflow.com/cdn-cgi/challenge-platform/scripts/jsd/main.js236ms224ms2ms1st
https://www.googletagmanager.com/gtag/js?id=G-WCZ03SZFCQ227ms191ms34ms3rd
https://stackoverflow.com/users/login206ms50ms12ms1st
https://dn0qt3r0xannq.cloudfront.net/stackoverflow-M6HzSe6yue/mapping.base/prebid-wrapper.js174ms102ms19ms3rd
https://edge.aditude.io/prebid/9.30.0.js?fork=1&v=6167788a58e716d678c6d136265c856c&modules=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
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202605010101/pubads_impl.js?cb=31098277159ms114ms37ms3rd
https://raven-static.aditude.io/prod/1.20.0-69wxiu/raven.js146ms110ms36ms3rd
https://stackoverflow.com/Content/Js/islands/signup-modal.en.js?v=f64ec881ea96116ms102ms1ms1st

Showing top 10 of 17 scripts

F
JS Bundles
Action
46 scripts, 624 KB unused
FIX
46 scripts, 624 KB unused
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 142 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://edge.aditude.io/prebid/9.30.0.js?fork=1&v=...: 100 KB unused (74%)
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://accounts.google.com/gsi/client: 72 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://raven-static.aditude.io/prod/1.20.0-69wxiu...: 63 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 624 KB
624 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=31098277189 KB142 KB (75%)✓3rd
https://edge.aditude.io/prebid/9.30.0.js?fork=1&v=6167788a58e716d678c6d136265c856c&modules=WyIzM2Fjcm9zc0lkU3lzdGVtIiwiYWRpdHVkZSIsImFsbG93QWN0aXZpdGllcyIsImFwcG5leHVzQmlkQWRhcHRlciIsImNvbnNlbnRNYW5hZ2VtZW50IiwiY29uc2VudE1hbmFnZW1lbnRHcHAiLCJjb25zZW50TWFuYWdlbWVudFVzcCIsImNvbnZlcnNhbnRCaWRBZGFwdGVyIiwiY3JpdGVvSWRTeXN0ZW0iLCJlcXVhdGl2QmlkQWRhcHRlciIsImZhYnJpY2tJZFN5c3RlbSIsImdkcHJFbmZvcmNlbWVudCIsImdwdFByZUF1Y3Rpb24iLCJpZDVJZFN5c3RlbSIsIml4QmlkQWRhcHRlciIsImthcmdvQmlkQWRhcHRlciIsIm1lZGlhbmV0QmlkQWRhcHRlciIsIm9wZW54QmlkQWRhcHRlciIsInByZWJpZFNlcnZlckJpZEFkYXB0ZXIiLCJwcmljZUZsb29ycyIsInB1YlByb3ZpZGVkSWRTeXN0ZW0iLCJwdWJtYXRpY0JpZEFkYXB0ZXIiLCJydWJpY29uQmlkQWRhcHRlciIsInNoYXJlZElkU3lzdGVtIiwic2hhcmV0aHJvdWdoQmlkQWRhcHRlciIsInRyaXBsZWxpZnRCaWRBZGFwdGVyIiwidHRkQmlkQWRhcHRlciIsInVuaWZpZWRJZFN5c3RlbSJd136 KB100 KB (74%)✓3rd
https://stackoverflow.com/Content/Js/full-anon.en.js?v=1184f324f5d2129 KB95 KB (74%)✓1st
https://accounts.google.com/gsi/client96 KB72 KB (75%)✓3rd
https://raven-static.aditude.io/prod/1.20.0-69wxiu/raven.js106 KB63 KB (60%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-WCZ03SZFCQ156 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
https://stackoverflow.com/Content/Js/webpack-chunks/stacks-svelte.en.js?v=297d3b9a88f613 KB—✓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
63 resources · 1.4 MB · 624 KB savings available
FIX
63 resources · 1.4 MB · 624 KB savings available
Warning::
Page weight 1.4 MB exceeds 1 MB target by 436 KB
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~624 KB of savings available
Warning::
31 third-party resources (62% of weight)
63 resources · 1.4 MiB · 31 third-party 435.8 KiB over 1MB target
JavaScript 81% · 1.2 MiB
CSS 14% · 207.3 KiB
Document 2% · 35.2 KiB
Other 2% · 27.6 KiB
Image 0% · 1.6 KiB

~623.6 KiB of savings available

Remove unused JavaScript: 623.6 KiB
B
Page Weight Budget
1.4 MB transferred, 63 requests
REVIEW
1.4 MB transferred, 63 requests
Info::
Page weighs 5.2 MB (1.4 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 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::
63 HTTP requests
Info::
Estimated 0.30 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
63 requests
0.30 g CO2 per page load
JavaScript 1.2 MiB 81%
CSS 207.3 KiB 14%
HTML 35.2 KiB 2%
Other 24.1 KiB 2%
Other 3.4 KiB 0%
Images 978 B 0%
Other 800 B 0%
0 2.4 MB 4.9 MB
Under budget

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
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
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Info::
All images are well-optimized
2 images 1 KB
0 oversized -0 KB
2 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+
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
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 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.
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
63 requests over 2472ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.9 s LCP 11.8 shttps://stackoverflow.com/users/login/users/login https://stackoverflow.com/users/login — 200 — 35.2 KiB — 229 ms — h2https://cdn.cookielaw.org/scripttemplates/gpp.stub.jscdn.cookielaw.org/scripttemplates/g... https://cdn.cookielaw.org/scripttemplates/gpp.stub.js — -1 — 0 B — 99 ms — https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 99 ms — https://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 — 62 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 — 145 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 — 30 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 — 56 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 — 58 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 — 58 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 — 59 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 — 4.6 KiB — 58 ms — h2https://stackoverflow.com/px.js?ch=1/px.js?ch=1 https://stackoverflow.com/px.js?ch=1 — 200 — 549 B — 151 ms — h2https://stackoverflow.com/px.js?ch=2/px.js?ch=2 https://stackoverflow.com/px.js?ch=2 — 200 — 369 B — 152 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 — 32 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 — 26 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 — 32.2 KiB — 44 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 — 12.8 KiB — 33 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 — 44 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 — 37 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 — 41 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 — 39 ms — h2https://stackoverflow.com/Content/Js/webpack-chunks/stacks-svelte-labs.en.js?v=b9cf031e2bdd/Content/Js/webpack-chunks/stacks-s... https://stackoverflow.com/Content/Js/webpack-chunks/stacks-svelte-labs.en.js?v=b9cf031e2bdd — 200 — 7.7 KiB — 47 ms — h2https://stackoverflow.com/Content/Js/webpack-chunks/8339.en.js?v=4cb8dd34a7f9/Content/Js/webpack-chunks/8339.en.... https://stackoverflow.com/Content/Js/webpack-chunks/8339.en.js?v=4cb8dd34a7f9 — 200 — 4.9 KiB — 45 ms — h2https://stackoverflow.com/Content/Js/webpack-chunks/7663.en.js?v=c67f16729ba4/Content/Js/webpack-chunks/7663.en.... https://stackoverflow.com/Content/Js/webpack-chunks/7663.en.js?v=c67f16729ba4 — 200 — 7.5 KiB — 33 ms — h2https://stackoverflow.com/Content/Js/webpack-chunks/3696.en.js?v=7ef09fb6562b/Content/Js/webpack-chunks/3696.en.... https://stackoverflow.com/Content/Js/webpack-chunks/3696.en.js?v=7ef09fb6562b — 200 — 2.1 KiB — 48 ms — h2https://stackoverflow.com/Content/Js/webpack-chunks/2458.en.js?v=33cc3da05f78/Content/Js/webpack-chunks/2458.en.... https://stackoverflow.com/Content/Js/webpack-chunks/2458.en.js?v=33cc3da05f78 — 200 — 818 B — 52 ms — h2https://stackoverflow.com/Content/Js/webpack-chunks/620.en.js?v=a432091814d8/Content/Js/webpack-chunks/620.en.j... https://stackoverflow.com/Content/Js/webpack-chunks/620.en.js?v=a432091814d8 — 200 — 1.6 KiB — 53 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
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Per-script blocking time, transfer cost, and cache headers
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Other
Costly
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Google Tag Manager
Tag Manager
Costly
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Unused 40%
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dn0qt3r0xannq.cloudfront.net
Other
Optional
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Unused 45%
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edge.aditude.io
Other
Optional
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Monthly Cost $2/mo
securepubads.g.doubleclick.net
Other
Optional
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Unused 75%
Monthly Cost $2/mo
raven-static.aditude.io
Other
Optional
Execution 146ms
Transfer 106 KB
Unused 60%
Monthly Cost $2/mo
dn0qt3r0xannq.cloudfront.net
Other
Optional
Execution 87ms
Transfer 4 KB
Monthly Cost $1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 71ms
Transfer 0 KB
Monthly Cost $1/mo
dn0qt3r0xannq.cloudfront.net
Other
Optional
Execution 63ms
Transfer 17 KB
Monthly Cost $1/mo
ajax.googleapis.com
Other
Optional
Execution 63ms
Transfer 30 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 314ms and costs ~$4/month
  • Google Tag Manager adds 227ms and costs ~$3/month

58% 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 314ms 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 227ms 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

74% 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

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

60% 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

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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