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Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
3
REVIEW
7
PASS
9
INFO
3

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

Mobile Desktop
88
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.
77
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.

711 ms

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

2.26 s

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

60 ms

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

0.016

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

965 ms

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

2.49 s

Page Load Progression

382 ms
764 ms
1.1 s
1.5 s
1.9 s
2.3 s
2.7 s
3.1 s
Checks
22
9 PASS 7 REVIEW 3 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 Bundles
Action
48 scripts, 687 KB unused
FIX
48 scripts, 687 KB unused
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 138 KB unused (73%)
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=...: 92 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202603.1...: 77 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 71 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 687 KB
687 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202605070101/pubads_impl.js?cb=31098367187 KB138 KB (73%)✓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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 KB92 KB (68%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js130 KB77 KB (59%)✓3rd
https://accounts.google.com/gsi/client96 KB71 KB (75%)✓3rd
https://raven-static.aditude.io/prod/1.20.0-69wxiu/raven.js106 KB64 KB (60%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-WCZ03SZFCQ155 KB61 KB (40%)✓3rd
https://dn0qt3r0xannq.cloudfront.net/stackoverflow-M6HzSe6yue/mapping.base/prebid-wrapper.js82 KB36 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
81 resources · 1.6 MB · 687 KB savings available
FIX
81 resources · 1.6 MB · 687 KB savings available
Warning::
Page weight 1.6 MB exceeds 1 MB target by 659 KB
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~687 KB of savings available
Warning::
49 third-party resources (67% of weight)
81 resources · 1.6 MiB · 49 third-party 658.5 KiB over 1MB target
JavaScript 80% · 1.3 MiB
CSS 13% · 212.1 KiB
Other 5% · 84.9 KiB
Document 2% · 35.2 KiB
Image 0% · 2.1 KiB

~687.3 KiB of savings available

Remove unused JavaScript: 687.3 KiB
C
Page Weight Budget
Action
1.6 MB transferred, 81 requests
REVIEW
1.6 MB transferred, 81 requests
Info::
Page weighs 6.4 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::
81 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
81 requests
0.34 g CO2 per page load
JavaScript 1.3 MiB 80%
CSS 207.4 KiB 12%
Other 61.4 KiB 4%
HTML 35.2 KiB 2%
Other 25.0 KiB 1%
Other 3.9 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
JS Execution Cost
917ms total JS execution
REVIEW
917ms total JS execution
Info::
https://stackoverflow.com/users/login: 244ms CPU time
Info::
Unattributable: 148ms CPU time
Info::
https://stackoverflow.com/Content/Js/islands/homep...: 101ms CPU time
Info::
https://securepubads.g.doubleclick.net/pagead/mana...: 96ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-WCZ0...: 81ms CPU time
Warning::
Third-party scripts: 501ms (55% of total)

Main Thread Breakdown

Script Evaluation 57% Other 15% Script Parsing & Compilation 11% Style & Layout 10% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://stackoverflow.com/users/login244ms20ms5ms1st
Unattributable148ms20ms0ms3rd
https://stackoverflow.com/Content/Js/islands/homepage-wizard.en.js?v=a74b3480697c101ms76ms1ms1st
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202605070101/pubads_impl.js?cb=3109836796ms75ms18ms3rd
https://www.googletagmanager.com/gtag/js?id=G-WCZ03SZFCQ81ms67ms14ms3rd
https://stackoverflow.com/cdn-cgi/challenge-platform/scripts/jsd/main.js71ms69ms1ms1st
https://edge.aditude.io/prebid/9.30.0.js?fork=1&v=6167788a58e716d678c6d136265c856c&modules=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
https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js61ms28ms16ms3rd
https://raven-static.aditude.io/prod/1.20.0-69wxiu/raven.js51ms36ms15ms3rd
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
4 images, 0 KB saveable
PASS
4 images, 0 KB saveable
Info::
All images are well-optimized
4 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+
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
81 requests over 2396ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 711 ms LCP 2.3 shttps://stackoverflow.com/users/login/users/login https://stackoverflow.com/users/login — 200 — 35.2 KiB — 138 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 — 40 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 8.9 KiB — 41 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 — 56 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 — 41 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 — 33 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 — 58 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 — 59 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 — 35 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 — 54 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 — 39 ms — h2https://stackoverflow.com/px.js?ch=1/px.js?ch=1 https://stackoverflow.com/px.js?ch=1 — 200 — 362 B — 73 ms — h2https://stackoverflow.com/px.js?ch=2/px.js?ch=2 https://stackoverflow.com/px.js?ch=2 — 200 — 547 B — 71 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 — 28 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 — 23 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 — 935 B — 17 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 285 B — 73 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 — 34 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 — 20 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 — 8.5 KiB — 26 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 — 28 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 — 1.8 KiB — 23 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 — 44 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 — 29 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 — 36 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 — 7.4 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 — 36 ms — 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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 — 14 ms — h3https://lexicon.33across.com/v1/envelope?pid=0015a00002qqhgFAAQ&gdpr=0&src=pbjs&ver=9.30.0&coppa=0&us_privacy=1---&gpp=DBABLA~BVQqAAAAAACA.QA&gpp_sid=7lexicon.33across.com/v1/envelope?pi... https://lexicon.33across.com/v1/envelope?pid=0015a00002qqhgFAAQ&gdpr=0&src=pbjs&ver=9.30.0&coppa=0&us_privacy=1---&gpp=DBABLA~BVQqAAAAAACA.QA&gpp_sid=7 — 200 — 1.6 KiB — 53 ms — h2https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Fstackoverflow.com%2F&domain=stackoverflow.com&cw=1&lsw=1&us_privacy=1---&gpp=DBABLA~BVQqAAAAAACA.QA&gpp_sid=7gum.criteo.com/sid/json?origin=preb... 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
55% of JavaScript execution is third-party
First-party Third-party 501ms · 714KB · $7/mo
Unattributable
Other
Optional
Execution 148ms
Transfer 0 KB
Monthly Cost $2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 96ms
Transfer 187 KB
Unused 73%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 81ms
Transfer 155 KB
Unused 40%
Monthly Cost $1/mo
edge.aditude.io
Other
Optional
Execution 64ms
Transfer 136 KB
Unused 68%
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 61ms
Transfer 130 KB
Unused 59%
Monthly Cost $1/mo
raven-static.aditude.io
Other
Optional
Execution 51ms
Transfer 106 KB
Unused 60%
Monthly Cost $1/mo

55% 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

73% 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

68% 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

59% 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

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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