https://wikisource.org
Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
91
GRADE
A
FIX
0
REVIEW
5
PASS
10
INFO
2
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
96
92
96
92
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.10 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.10 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
204 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.
1.17 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.
3.07 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 sChecks
1710 PASS 5 REVIEW
BImage Optimization28 images, 0 KB saveableREVIEW
Image Optimization
28 images, 0 KB saveable
28 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
28 images 131 KB
0 oversized -0 KB
13 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.
CJS Execution CostAction1114ms total JS executionREVIEW
JS Execution Cost
Action1114ms total JS execution
1114ms total JS execution
Warning::
https://wikisource.org/wiki/Main_Page: 624ms CPU time
Info::
Unattributable: 247ms CPU time
Info::
https://wikisource.org/w/load.php?lang=en&modules=...: 135ms CPU time
Info::
https://wikisource.org/w/load.php?lang=en&modules=...: 108ms CPU time
Info::
Third-party scripts: 247ms (22% of total)
Main Thread Breakdown
Style & Layout 38% Script Evaluation 27% Other 23% Script Parsing & Compilation 5% Rendering 5% Parse HTML & CSS 3%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://wikisource.org/wiki/Main_Page | 624ms | 9ms | 4ms | 1st |
| Unattributable | 247ms | 6ms | 0ms | 3rd |
| https://wikisource.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva | 135ms | 115ms | 4ms | 1st |
| https://wikisource.org/w/load.php?lang=en&modules=ext.centralNotice.choiceData%2Cdisplay%2CgeoIP%2CimpressionDiet%2CkvStore%2CstartUp%7Cext.centralauth.centralautologin%7Cext.checkUser.clientHints%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.parsermigration.survey%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Coojs%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%7Cskins.minerva.scripts%7Cwikibase.databox.fromWikidata&skin=minerva&version=17s3y | 108ms | 49ms | 55ms | 1st |
BJS Bundles4 scripts, 82 KB unusedREVIEW
JS Bundles
4 scripts, 82 KB unused
4 scripts, 82 KB unused
Warning::
https://wikisource.org/w/load.php?lang=en&modules=...: 82 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 82 KB
82 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://wikisource.org/w/load.php?lang=en&modules=ext.centralNotice.choiceData%2Cdisplay%2CgeoIP%2CimpressionDiet%2CkvStore%2CstartUp%7Cext.centralauth.centralautologin%7Cext.checkUser.clientHints%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.parsermigration.survey%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Coojs%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%7Cskins.minerva.scripts%7Cwikibase.databox.fromWikidata&skin=minerva&version=17s3y | 183 KB | 82 KB (45%) | ✓ | 1st |
| https://wikisource.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva | 19 KB | — | ✓ | 1st |
| https://wikisource.org/w/load.php?lang=en&modules=ext.visualEditor.core.utils.parsing%7Cext.visualEditor.targetLoader%2Ctrack%2Cve&skin=minerva&version=sflfg | 9 KB | — | ✓ | 1st |
| https://auth.wikimedia.org/metawiki/wiki/Special:CentralAutoLogin/checkLoggedIn?useformat=mobile&wikiid=sourceswiki&usesul3=1&type=script | 1 KB | — | ✓ | 3rd |
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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
BHTTP Cachings-maxage=1200, must-revalidate, max-age=0REVIEW
HTTP Caching
s-maxage=1200, must-revalidate, max-age=0
s-maxage=1200, must-revalidate, max-age=0
Info::
Cache-Control header is set
Got: s-maxage=1200, must-revalidate, max-age=0
Info::
CDN TTL: 20 minutes (s-maxage=1200)
Info::
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 Budget411 KB transferred, 38 requestsPASS
Page Weight Budget
411 KB transferred, 38 requests
411 KB transferred, 38 requests
Info::
Page weighs 1.2 MB (411 KB transferred)
Info::
38 HTTP requests
Info::
Estimated 0.08 g CO2 per page load
411 KB transferred
38 requests
0.08 g CO2 per page load
JavaScript 212.8 KiB 52%
Images 130.8 KiB 32%
HTML 34.5 KiB 8%
CSS 19.6 KiB 5%
Other 11.6 KiB 3%
Other 1.7 KiB 0%
0 2.4 MB 4.9 MB
Under budget
AThird-Party Impact29% third-party, 0 ms blockingPASS
Third-Party Impact
29% third-party, 0 ms blocking
29% third-party, 0 ms blocking
Info::
Third-party code accounts for 29% of page weight (118.1 KiB of 411.1 KiB)
Info::
Third-party blocking time is low (0 ms)
71%
29%
First-party Third-party
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Font LoadingNo web fonts (system fonts)PASS
Font Loading
No web fonts (system fonts)
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource Hints3 hints, 0 missing preconnectsPASS
Resource Hints
3 hints, 0 missing preconnects
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)
Current Resource Hints
preconnect 1
preload—
dns-prefetch 2
prefetch—
3 resource hints configured
A+Page Weight Inventory38 resources · 411 KB · 82 KB savings availablePASS
Page Weight Inventory
38 resources · 411 KB · 82 KB savings available
38 resources · 411 KB · 82 KB savings available
Info::
Within 1MB page-weight target
Got: 411 KB
Info::
~82 KB of savings available
Info::
19 third-party resources (29% of weight)
38 resources · 411.1 KiB · 19 third-party Within 1MB page-weight target
JavaScript 52% · 212.8 KiB
Image 33% · 137.2 KiB
Document 10% · 39.7 KiB
CSS 5% · 19.6 KiB
Other 0% · 1.7 KiB
~82.1 KiB of savings available
Remove unused JavaScript: 82.1 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 38 resources | 411.1 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
Render-Blocking Resources
No render-blocking resources detected
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+Third-Party ResourcesNo third-party resources detectedPASS
Third-Party Resources
No third-party resources detected
No third-party resources detected
Network Waterfall38 requests over 574msINFO
Network Waterfall
38 requests over 574ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
22% of JavaScript execution is third-party
First-party Third-party 247ms · 0KB · $1/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 247ms | 0 KB | — | $1/mo | Costly |
Unattributable
Other
Execution 247ms
Transfer 0 KB
Monthly Cost $1/mo
These scripts may cost more than they're worth
- Unattributable adds 247ms and costs ~$1/month
Unattributable takes 247ms 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
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.