Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

100

Performance

Accessibility

100

Best Practices

SEO

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

1.21 s

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

1.46 s

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

83 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.

1.76 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.

4.38 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

10 PASS 5 REVIEW

Image Optimization

39 images, 0 KB saveable

REVIEW

39 images, 0 KB saveable

is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

39 images 252 KB

0 oversized -0 KB

10 legacy format

1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

JS Execution Cost

993ms total JS execution

REVIEW

993ms total JS execution

Unattributable: 377ms CPU time

https://de.wikipedia.org/wiki/Wikipedia:Hauptseite: 227ms CPU time

https://de.wikipedia.org/w/load.php?lang=de&module...: 198ms CPU time

https://de.wikipedia.org/w/load.php?lang=de&module...: 191ms CPU time

Third-party scripts: 377ms (38% of total)

Main Thread Breakdown

Script Evaluation 37% Other 32% Style & Layout 12% Script Parsing & Compilation 12% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	377ms	6ms	0ms	3rd
https://de.wikipedia.org/wiki/Wikipedia:Hauptseite	227ms	8ms	5ms	1st
https://de.wikipedia.org/w/load.php?lang=de&modules=startup&only=scripts&raw=1&skin=minerva	198ms	162ms	6ms	1st
https://de.wikipedia.org/w/load.php?lang=de&modules=ext.centralNotice.choiceData%2Cdisplay%2CgeoIP%2CimpressionDiet%2CkvStore%2CstartUp%7Cext.centralauth.centralautologin%7Cext.checkUser.clientHints%7Cext.cx.entrypoints.languagesearcher.init%7Cext.cx.eventlogging.campaigns%7Cext.discussionTools.init%2Cminervaicons%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.parsermigration.survey%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Cmoment%2Coojs%2Coojs-ui-core%2Coojs-ui-windows%2Crangefix%2Csite%7Cjquery.client%2CtextSelection%7Cmediawiki.DateFormatter%2CString%2CTitle%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctemplate%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax%7Cmediawiki.template.mustache%7Cmobile.codex.styles%7Cmobile.init%2Cstartup%7Cmw.externalguidance.init%7Coojs-ui-windows.icons%7Cskins.minerva.scripts%7Cwikibase.databox.fromWikidata&skin=minerva&version=otloh	191ms	62ms	120ms	1st

JS Bundles

Action

7 scripts, 160 KB unused

REVIEW

7 scripts, 160 KB unused

https://de.wikipedia.org/w/load.php?lang=de&module...: 160 KB unused (52%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 160 KB

160 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://de.wikipedia.org/w/load.php?lang=de&modules=ext.centralNotice.choiceData%2Cdisplay%2CgeoIP%2CimpressionDiet%2CkvStore%2CstartUp%7Cext.centralauth.centralautologin%7Cext.checkUser.clientHints%7Cext.cx.entrypoints.languagesearcher.init%7Cext.cx.eventlogging.campaigns%7Cext.discussionTools.init%2Cminervaicons%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.parsermigration.survey%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Cmoment%2Coojs%2Coojs-ui-core%2Coojs-ui-windows%2Crangefix%2Csite%7Cjquery.client%2CtextSelection%7Cmediawiki.DateFormatter%2CString%2CTitle%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctemplate%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax%7Cmediawiki.template.mustache%7Cmobile.codex.styles%7Cmobile.init%2Cstartup%7Cmw.externalguidance.init%7Coojs-ui-windows.icons%7Cskins.minerva.scripts%7Cwikibase.databox.fromWikidata&skin=minerva&version=otloh	310 KB	160 KB (52%)	✓	1st
https://de.wikipedia.org/w/load.php?lang=de&modules=startup&only=scripts&raw=1&skin=minerva	20 KB	—	✓	1st
https://de.wikipedia.org/w/load.php?lang=de&modules=ext.gadget.NavFrameLegacy%2CnavileisteAutocollapse&skin=minerva&version=17vz0	2 KB	—	✓	1st
https://de.wikipedia.org/w/load.php?lang=de&modules=ext.visualEditor.core.utils.parsing%7Cext.visualEditor.targetLoader%2Ctrack%2Cve&skin=minerva&version=1aepg	9 KB	—	✓	1st
https://auth.wikimedia.org/metawiki/wiki/Special:CentralAutoLogin/checkLoggedIn?useformat=mobile&wikiid=dewiki&usesul3=1&type=script	1 KB	—	✓	3rd
https://de.wikipedia.org/w/load.php?lang=de&modules=mediawiki.action.view.postEdit%7Cmediawiki.notification%2CtempUserCreated%7Coojs-ui.styles.icons-interactions&skin=minerva&version=14ejk	9 KB	—	✓	1st
https://de.wikipedia.org/w/load.php?lang=de&modules=oojs-ui-widgets%7Coojs-ui-widgets.icons%7Coojs-ui.styles.icons-editing-core&skin=minerva&version=1pkm4	20 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

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

HTTP Caching

s-maxage=1200, must-revalidate, max-age=0

REVIEW

s-maxage=1200, must-revalidate, max-age=0

Cache-Control header is set

Got: s-maxage=1200, must-revalidate, max-age=0

CDN TTL: 20 minutes (s-maxage=1200)

Last-Modified header present

Cache-Control

s-maxage=1200, must-revalidate, max-age=0

Directive	Value	Meaning
s-maxage	1200	CDN caches for 20 minutes
must-revalidate	—	Must recheck with server after expiry
max-age	0	Cache for 0 seconds

A+

Page Weight Budget

696 KB transferred, 55 requests

PASS

696 KB transferred, 55 requests

Page weighs 2.2 MB (696 KB transferred)

55 HTTP requests

Estimated 0.14 g CO2 per page load

696 KB transferred

55 requests

0.14 g CO2 per page load

JavaScript 372.0 KiB 53%

Images 251.5 KiB 36%

CSS 36.1 KiB 5%

HTML 25.0 KiB 4%

Other 9.4 KiB 1%

Other 1.8 KiB 0%

0 2.4 MB 4.9 MB

Under budget

Third-Party Impact

34% third-party, 0 ms blocking

PASS

34% third-party, 0 ms blocking

Third-party code accounts for 34% of page weight (240.0 KiB of 695.8 KiB)

Third-party blocking time is low (0 ms)

66%

34%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

No web fonts (system fonts)

PASS

No web fonts (system fonts)

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

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

3 hints, 0 missing preconnects

PASS

3 hints, 0 missing preconnects

Page uses 3 resource hint(s)

Current Resource Hints

preconnect

preload

—

dns-prefetch

prefetch

—

3 resource hints configured

A+

Page Weight Inventory

55 resources · 696 KB · 160 KB savings available

PASS

55 resources · 696 KB · 160 KB savings available

Within 1MB page-weight target

Got: 696 KB

~160 KB of savings available

31 third-party resources (34% of weight)

1 resources over 200KB

55 resources · 695.8 KiB · 31 third-party Within 1MB page-weight target

JavaScript 53% · 372.0 KiB

Image 37% · 255.5 KiB

CSS 5% · 36.1 KiB

Document 4% · 30.3 KiB

Other 0% · 1.8 KiB

~160.0 KiB of savings available

Remove unused JavaScript: 160.0 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

55 resources			695.8 KiB

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

Network Waterfall

55 requests over 799ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

38% of JavaScript execution is third-party

First-party Third-party 377ms · 0KB · €4/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	377ms	0 KB	—	€4/mo	Costly

Unattributable

Other

Costly

Execution 377ms

Transfer 0 KB

Monthly Cost €4/mo

These scripts may cost more than they're worth

Unattributable adds 377ms and costs ~€4/month

Unattributable takes 377ms 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.