Performance
· 15 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.
1.36 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.24 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
238 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.024
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.64 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.
4.76 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 sFPage Weight BudgetAction5.8 MB transferred, 222 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
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction46 scripts, 779 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.20min.ch/_next/static/chunks/lib-026b7ed40fd38853.js | 246 KB | 133 KB (54%) | ✓ | 3rd |
| https://www.20min.ch/_next/static/chunks/commons-4eafbc67d45780c1.js | 115 KB | 97 KB (85%) | ✓ | 3rd |
| https://www.20min.ch/_next/static/chunks/pages/story/%5Bslug%5D-d6a1a5ec66e98dbc.js | 0 KB | 75 KB (53%) | ✓ | 3rd |
| https://www.20min.ch/_next/static/chunks/pages/story/%5Bslug%5D-d6a1a5ec66e98dbc.js | 27 KB | 75 KB (53%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js | 130 KB | 66 KB (51%) | ✓ | 3rd |
| https://sst.20min.ch/gtag/js?id=G-85DW9RPHKP&cx=c>m=4e64k0&sign=61e4751cf0425a8a70149b11adf47ab5fa6e7d5b73c61073ab87ec637bc4fd09_20260422 | 164 KB | 64 KB (39%) | ✓ | 3rd |
| https://www.20min.ch/_next/static/chunks/1013-6faaab72ca953153.js | 132 KB | 62 KB (47%) | ✓ | 3rd |
| https://sst.20min.ch/gtm.js?id=GTM-PKTSKJX | 168 KB | 59 KB (35%) | ✓ | 3rd |
| https://www.20min.ch/_next/static/chunks/pages/_app-3ad6b01d027b8bb7.js | 147 KB | 51 KB (35%) | ✓ | 3rd |
| https://fundingchoicesmessages.google.com/i/pub-3841242337561994?ers=1 | 70 KB | 35 KB (51%) | ✓ | 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 InventoryAction222 resources · 5.8 MB · 779 KB savings availableFIX
~778.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 222 resources | 5.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction126 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
CJS Execution CostAction1919ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.20min.ch/_next/static/chunks/framework-9c8eb74755a8d703.js | 594ms | 501ms | 4ms | 3rd |
| Unattributable | 315ms | 11ms | 0ms | 3rd |
| https://www.20min.ch/ | 260ms | 10ms | 1ms | 3rd |
| https://www.20min.ch/_next/static/chunks/commons-4eafbc67d45780c1.js | 158ms | 29ms | 18ms | 3rd |
| https://www.20min.ch/_next/static/chunks/pages/_app-3ad6b01d027b8bb7.js | 131ms | 112ms | 16ms | 3rd |
| https://www.20min.ch/_next/static/chunks/1013-6faaab72ca953153.js | 106ms | 54ms | 10ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202603.1.0/otTCF.js | 106ms | 94ms | 1ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js | 100ms | 58ms | 10ms | 3rd |
| https://sst.20min.ch/gtm.js?id=GTM-PKTSKJX | 90ms | 74ms | 15ms | 3rd |
| https://sst.20min.ch/gtag/js?id=G-85DW9RPHKP&cx=c>m=4e64k0&sign=61e4751cf0425a8a70149b11adf47ab5fa6e7d5b73c61073ab87ec637bc4fd09_20260422 | 57ms | 48ms | 10ms | 3rd |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (279 KB)PASS
Web fonts
3
279 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~123 KB and ~246 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall222 requests over 3169msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.20min.ch www.20min.ch | Other | 594ms | 67 KB | 46% | CHF9/mo | Costly |
Unattributable Unattributable | Other | 315ms | 0 KB | — | CHF5/mo | Costly |
www.20min.ch www.20min.ch | Other | 260ms | 144 KB | — | CHF4/mo | Costly |
www.20min.ch www.20min.ch | Other | 158ms | 115 KB | 85% | CHF2/mo | Optional |
www.20min.ch www.20min.ch | Other | 131ms | 147 KB | 35% | CHF2/mo | Optional |
www.20min.ch www.20min.ch | Other | 106ms | 132 KB | 47% | CHF2/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 106ms | 18 KB | — | CHF2/mo | Essential |
OneTrust cdn.cookielaw.org | Consent | 100ms | 130 KB | 51% | CHF2/mo | Essential |
sst.20min.ch sst.20min.ch | Other | 90ms | 168 KB | 35% | CHF1/mo | Optional |
sst.20min.ch sst.20min.ch | Other | 57ms | 164 KB | 39% | CHF1/mo | Optional |
These scripts may cost more than they're worth
- www.20min.ch adds 594ms and costs ~CHF9/month
- Unattributable adds 315ms and costs ~CHF5/month
- www.20min.ch adds 260ms and costs ~CHF4/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.20min.ch takes 594ms 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 315ms 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.20min.ch takes 260ms 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
85% of www.20min.ch'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
51% of OneTrust'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