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https://www.wikipedia.org

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
0
REVIEW
2
PASS
10
INFO
2

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

Mobile Desktop
93
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.

255 ms

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

495 ms

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

206 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.

729 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.

603 ms

Page Load Progression

381 ms
763 ms
1.1 s
1.5 s
1.9 s
2.3 s
2.7 s
3.0 s
Checks
14
10 PASS 2 REVIEW
B
JS Execution Cost
710ms total JS execution
REVIEW
710ms total JS execution
Warning::
https://www.wikipedia.org/: 638ms CPU time
Info::
Unattributable: 72ms CPU time
Info::
Third-party scripts: 72ms (10% of total)

Main Thread Breakdown

Style & Layout 81% Other 12%
ScriptTotalScriptingParse/CompileParty
https://www.wikipedia.org/638ms7ms1ms1st
Unattributable72ms3ms0ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
254 KB transferred, 9 requests
PASS
254 KB transferred, 9 requests
Info::
Page weighs 398 KB (254 KB transferred)
Info::
9 HTTP requests
Info::
Estimated 0.05 g CO2 per page load
254 KB / 2.4 MB budget
254 KB transferred
9 requests
0.05 g CO2 per page load
Other 159.1 KiB 63%
Images 54.2 KiB 21%
HTML 27.7 KiB 11%
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 54 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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 72ms · 0KB · $1/mo
Unattributable
Other
Optional
Execution 72ms
Transfer 0 KB
Monthly Cost $1/mo

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.

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