Skip to content
https://www.wikipedia.org

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
1
REVIEW
1
PASS
10
INFO
2

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

Mobile Desktop
87
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

1.48 s

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

1.80 s

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

464 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.

1.56 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.

2.05 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
14
10 PASS 1 REVIEW 1 FIX
D
JS Execution Cost
Action
2546ms total JS execution
FIX
2546ms total JS execution
Warning::
https://www.wikipedia.org/: 2231ms CPU time
Warning::
Unattributable: 263ms CPU time
Info::
https://www.wikipedia.org/portal/wikipedia.org/ass...: 52ms CPU time
Info::
Third-party scripts: 263ms (10% of total)

Main Thread Breakdown

Style & Layout 81% Other 13%
ScriptTotalScriptingParse/CompileParty
https://www.wikipedia.org/2231ms13ms3ms1st
Unattributable263ms11ms0ms3rd
https://www.wikipedia.org/portal/wikipedia.org/assets/js/index-90de98612a.js52ms37ms5ms1st
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
276 KB transferred, 9 requests
PASS
276 KB transferred, 9 requests
Info::
Page weighs 420 KB (276 KB transferred)
Info::
9 HTTP requests
Info::
Estimated 0.06 g CO2 per page load
276 KB / 2.4 MB budget
276 KB transferred
9 requests
0.06 g CO2 per page load
Other 159.1 KiB 58%
Images 76.6 KiB 28%
HTML 27.7 KiB 10%
JavaScript 11.0 KiB 4%
Other 1.8 KiB 1%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-party.
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 77 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+
JS Bundles
2 scripts, 0 KB unused
PASS
2 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.wikipedia.org/portal/wikipedia.org/assets/js/index-90de98612a.js10 KB—✓1st
https://www.wikipedia.org/portal/wikipedia.org/assets/js/gt-ie9-507b16b6be.js1 KB—✓1st
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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 resource hints configured

A+
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: s-maxage=86400, must-revalidate, max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
CDN TTL: 1 day (s-maxage=86400)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

s-maxage=86400, must-revalidate, max-age=3600

DirectiveValueMeaning
s-maxage86400CDN caches for 1 day
must-revalidate—Must recheck with server after expiry
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
9 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
10% of JavaScript execution is third-party
First-party Third-party 263ms · 0KB · $3/mo
Unattributable
Other
Costly
Execution 263ms
Transfer 0 KB
Monthly Cost $3/mo

These scripts may cost more than they're worth

  • Unattributable adds 263ms and costs ~$3/month

Unattributable takes 263ms 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

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback