Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
8.47 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
25.57 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
656 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.
8.99 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.
26.45 s
Page Load Progression
FPage Weight BudgetAction5.9 MB transferred, 86 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction4106ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.wsws.org/fr?redirect=true | 941ms | 71ms | 5ms | 3rd |
| https://www.wsws.org/_next/static/chunks/framework-b95d233139123616.js | 822ms | 543ms | 13ms | 3rd |
| Unattributable | 660ms | 72ms | 0ms | 3rd |
| https://cmp.inmobi.com/tcfv2/56/cmp2ui-en.js | 380ms | 177ms | 36ms | 3rd |
| https://cmp.inmobi.com/tcfv2/56/cmp2.js?referer=wsws.org | 337ms | 249ms | 45ms | 3rd |
| https://mautic.wsws.org/mtc.js | 211ms | 141ms | 8ms | 3rd |
| https://www.wsws.org/_next/static/chunks/4998-1f1d03378530dfc5.js | 167ms | 9ms | 30ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=UA-121098080-1 | 153ms | 117ms | 35ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-WZVMKD5RMF&cx=c>m=4e64k0 | 146ms | 103ms | 42ms | 3rd |
| https://www.wsws.org/_next/static/chunks/pages/%5Blocale%5D-2de7e8b10aaf614f.js | 141ms | 139ms | 1ms | 3rd |
Showing top 10 of 12 scripts
DJS BundlesAction35 scripts, 463 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.wsws.org/_next/static/chunks/4998-1f1d03378530dfc5.js | 118 KB | 83 KB (71%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=UA-121098080-1 | 125 KB | 62 KB (49%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-WZVMKD5RMF&cx=c>m=4e64k0 | 149 KB | 61 KB (41%) | ✓ | 3rd |
| https://cmp.inmobi.com/tcfv2/56/cmp2.js?referer=wsws.org | 113 KB | 57 KB (51%) | ✓ | 3rd |
| https://cmp.inmobi.com/tcfv2/56/cmp2ui-en.js | 105 KB | 49 KB (47%) | ✓ | 3rd |
| https://www.wsws.org/_next/static/chunks/3835-b6fdd8b283b4a94d.js | 58 KB | 38 KB (65%) | ✓ | 3rd |
| https://www.wsws.org/_next/static/chunks/1152-635a365e31a4ae2e.js | 0 KB | 30 KB (98%) | ✓ | 3rd |
| https://www.wsws.org/_next/static/chunks/1152-635a365e31a4ae2e.js | 8 KB | 30 KB (98%) | ✓ | 3rd |
| https://cdn.matomo.cloud/worldsocialistwebsite.matomo.cloud/matomo.js | 39 KB | 30 KB (77%) | ✓ | 3rd |
| https://mautic.wsws.org/mtc.js | 28 KB | 25 KB (90%) | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction86 resources · 5.9 MB · 463 KB savings availableFIX
~462.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 86 resources | 5.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction23 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
A+Text CompressionAll text resources are compressedPASS
A+Font Loading9 fonts (829 KB)PASS
Web fonts
9
829 KB total
Render-blocking
0
of 9
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~417 KB and ~834 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints17 hints, 0 missing preconnectsPASS
Current Resource Hints
17 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Hetzner Online GmbH
Network Waterfall86 requests over 2361msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.wsws.org www.wsws.org | Other | 941ms | 327 KB | — | €10/mo | Costly |
www.wsws.org www.wsws.org | Other | 822ms | 54 KB | — | €9/mo | Costly |
Unattributable Unattributable | Other | 660ms | 0 KB | — | €7/mo | Costly |
cmp.inmobi.com cmp.inmobi.com | Other | 380ms | 105 KB | 47% | €4/mo | Costly |
cmp.inmobi.com cmp.inmobi.com | Other | 337ms | 113 KB | 51% | €4/mo | Costly |
mautic.wsws.org mautic.wsws.org | Other | 211ms | 28 KB | 90% | €2/mo | Costly |
www.wsws.org www.wsws.org | Other | 167ms | 118 KB | 71% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 153ms | 125 KB | 49% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 146ms | 149 KB | 41% | €2/mo | Optional |
www.wsws.org www.wsws.org | Other | 141ms | 2 KB | — | €2/mo | Optional |
www.wsws.org www.wsws.org | Other | 86ms | 41 KB | — | €1/mo | Optional |
Google Analytics www.google-analytics.com | Analytics | 61ms | 21 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.wsws.org adds 941ms and costs ~€10/month
- www.wsws.org adds 822ms and costs ~€9/month
- Unattributable adds 660ms and costs ~€7/month
- cmp.inmobi.com adds 380ms and costs ~€4/month
- cmp.inmobi.com adds 337ms and costs ~€4/month
- mautic.wsws.org adds 211ms and costs ~€2/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.
Learn more ▾ ▴
Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.
Source: web.dev
www.wsws.org takes 941ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.wsws.org takes 822ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 660ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
cmp.inmobi.com takes 380ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
cmp.inmobi.com takes 337ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
51% of cmp.inmobi.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
mautic.wsws.org takes 211ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
90% of mautic.wsws.org's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
71% of www.wsws.org's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev