https://wikisource.org
Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
91
GRADE
A
FIX
0
REVIEW
6
PASS
7
INFO
2
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
99
97
100
92
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
560 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
790 ms
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
6 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.
833 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.
1.84 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
157 PASS 6 REVIEW
CPage Weight BudgetAction1.8 MB transferred, 60 requestsREVIEW
Page Weight Budget
Action1.8 MB transferred, 60 requests
1.8 MB transferred, 60 requests
Info::
Page weighs 2.7 MB (1.8 MB transferred)
Info::
Fonts are 1.4 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.4 MB
Info::
60 HTTP requests
Info::
Estimated 0.37 g CO2 per page load
1.8 MB transferred
60 requests
0.37 g CO2 per page load
Fonts 1.4 MiB 77%
JavaScript 247.8 KiB 14%
Images 95.5 KiB 5%
HTML 37.4 KiB 2%
CSS 23.6 KiB 1%
Other 11.6 KiB 1%
Other 6.3 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit
Subset fonts to include only used characters, or switch to system font stacks.
Why this matters
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
BImage Optimization35 images, 0 KB saveableREVIEW
Image Optimization
35 images, 0 KB saveable
35 images, 0 KB saveable
Info::
All images are well-optimized
35 images 95 KB
0 oversized -0 KB
22 legacy format
0 missing dimensions CLS risk
BJS Bundles10 scripts, 79 KB unusedREVIEW
JS Bundles
10 scripts, 79 KB unused
10 scripts, 79 KB unused
Warning::
https://wikisource.org/w/load.php?lang=en&modules=...: 79 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 79 KB
79 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.uls.interface%2Cpreferences%2Cwebfonts%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Coojs%2Csite%7Cjquery.client%2CtextSelection%7Cmediawiki.String%2CTitle%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.editfont.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.vector-2022%7Cwikibase.databox.fromWikidata&skin=vector-2022&version=12o1q | 184 KB | 79 KB (43%) | ✓ | 1st |
| https://wikisource.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022 | 19 KB | — | ✓ | 1st |
| https://wikisource.org/w/load.php?lang=en&modules=ext.visualEditor.core.utils.parsing%7Cext.visualEditor.desktopArticleTarget.init%7Cext.visualEditor.progressBarWidget%2CsupportCheck%2CtargetLoader%2CtempWikitextEditorWidget%2Ctrack%2Cve&skin=vector-2022&version=1x0mj | 18 KB | — | ✓ | 1st |
| https://wikisource.org/w/load.php?lang=en&modules=mw.config.values.wbCurrentSiteDetails%2CwbRepo%7Coojs-ui.styles.icons-editing-core&skin=vector-2022&version=rp506 | 3 KB | — | ✓ | 1st |
| https://wikisource.org/w/index.php?title=MediaWiki:Base.js&action=raw&ctype=text/javascript&_=1776800536839 | 6 KB | — | ✓ | 1st |
| https://auth.wikimedia.org/metawiki/wiki/Special:CentralAutoLogin/checkLoggedIn?useformat=desktop&wikiid=sourceswiki&usesul3=1&type=script | 1 KB | — | ✓ | 3rd |
| https://wikisource.org/w/index.php?title=MediaWiki:InterWikiTransclusion.js&action=raw&ctype=text/javascript | 6 KB | — | ✓ | 1st |
| https://wikisource.org/w/index.php?title=MediaWiki:TranscludedIn.js&action=raw&ctype=text/javascript | 5 KB | — | ✓ | 1st |
| https://wikisource.org/w/index.php?title=MediaWiki:Compare.js&action=raw&ctype=text/javascript | 7 KB | — | ✓ | 1st |
| https://wikisource.org/w/load.php?lang=en&modules=ext.uls.webfonts.repository&skin=vector-2022&version=1how9 | 6 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
CPage Weight InventoryAction60 resources · 1.8 MB · 79 KB savings availableREVIEW
Page Weight Inventory
Action60 resources · 1.8 MB · 79 KB savings available
60 resources · 1.8 MB · 79 KB savings available
Warning::
Page weight 791 KB over 1MB target
Got: 1.8 MB Expected: ≤ 1 MB
Info::
~79 KB of savings available
Info::
19 third-party resources (4% of weight)
Info::
2 resources over 200KB
60 resources · 1.8 MiB · 19 third-party 790.9 KiB over 1MB target
Font 77% · 1.4 MiB
JavaScript 14% · 254.1 KiB
Image 6% · 101.8 KiB
Document 2% · 42.6 KiB
CSS 1% · 23.6 KiB
~78.7 KiB of savings available
Remove unused JavaScript: 78.7 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 60 resources | 1.8 MiB | ||||||
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+Third-Party Impact4% third-party, 0 ms blockingPASS
Third-Party Impact
4% third-party, 0 ms blocking
4% third-party, 0 ms blocking
Info::
Third-party code accounts for 4% of page weight (66.2 KiB of 1.8 MiB)
Info::
Third-party blocking time is low (0 ms)
96%
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+JS Execution Cost417ms total JS executionPASS
JS Execution Cost
417ms total JS execution
417ms total JS execution
Warning::
https://wikisource.org/wiki/Main_Page: 261ms CPU time
Info::
Unattributable: 80ms CPU time
Info::
https://wikisource.org/w/load.php?lang=en&modules=...: 76ms CPU time
Info::
Third-party scripts: 80ms (19% of total)
Main Thread Breakdown
Style & Layout 39% Script Evaluation 23% Other 22% Rendering 9% Script Parsing & Compilation 5%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://wikisource.org/wiki/Main_Page | 261ms | 3ms | 1ms | 1st |
| Unattributable | 80ms | 1ms | 0ms | 3rd |
| 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.uls.interface%2Cpreferences%2Cwebfonts%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Coojs%2Csite%7Cjquery.client%2CtextSelection%7Cmediawiki.String%2CTitle%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.editfont.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.vector-2022%7Cwikibase.databox.fromWikidata&skin=vector-2022&version=12o1q | 76ms | 47ms | 19ms | 1st |
A+Font Loading8 fonts (1393 KB)PASS
Font Loading
8 fonts (1393 KB)
8 fonts (1393 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
8
1393 KB total
Render-blocking
0
of 8
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
SiyamRupali.woff2 woff2 swap
Size 134 KB
Load time 81 ms
Start 657 ms
Risk FOUT — text flashes from fallback to web font
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
TharLon.woff2 woff2 swap
Size 87 KB
Load time 71 ms
Start 658 ms
Risk FOUT — text flashes from fallback to web font
Vimala.woff2 woff2 swap
Size 28 KB
Load time 47 ms
Start 658 ms
Risk FOUT — text flashes from fallback to web font
Akkadian.woff2 woff2 swap
Size 607 KB
Load time 115 ms
Start 658 ms
Risk FOUT — text flashes from fallback to web font
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
BabelStoneTibetanSlim.w... woff2 swap
Size 463 KB
Load time 110 ms
Start 658 ms
Risk FOUT — text flashes from fallback to web font
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
KhmerOSbattambang.woff2 woff2 swap
Size 54 KB
Load time 82 ms
Start 658 ms
Risk FOUT — text flashes from fallback to web font
Phetsarath-Regular.woff2 woff2 swap
Size 16 KB
Load time 72 ms
Start 659 ms
Risk FOUT — text flashes from fallback to web font
Artaxerxes.woff2 woff2 swap
Size 4 KB
Load time 59 ms
Start 660 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
- Preload critical fonts (priority=high)
- Use woff2 format for all fonts
- Set font-display to swap, optional, or fallback
- Subset large fonts (≤100 KB each)
Fixing the unchecked items could save ~602 KB and ~1204 ms
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 HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
Network Waterfall60 requests over 846msINFO
Network Waterfall
60 requests over 846ms
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
19% of JavaScript execution is third-party
First-party Third-party 80ms · 0KB · $0/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 80ms | 0 KB | — | $0/mo | Optional |
Unattributable
Other
Execution 80ms
Transfer 0 KB
Monthly Cost $0/mo
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.