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.
682 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.67 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
28 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.
1.46 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.
3.91 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 BudgetAction3.3 MB transferred, 166 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
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
DJS BundlesAction39 scripts, 340 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.20minutes.fr/js/main-2.40.5.min.js | 352 KB | 231 KB (67%) | ✓ | 3rd |
| https://membre.20minutes.fr/embed.bundle.js | 87 KB | 64 KB (74%) | ✓ | 3rd |
| https://sdk.privacy-center.org/sdk/d4911c3d5b4b9a80b40e05167f53d1b1e8da81f3/modern/sdk.d4911c3d5b4b9a80b40e05167f53d1b1e8da81f3.js | 101 KB | 44 KB (44%) | ✓ | 3rd |
| https://boot.pbstck.com/v1/adm/fe9871ff-1f65-40b5-86bb-6a3bf0d9af4a | 3 KB | — | ✓ | 3rd |
| https://www.20minutes.fr/js/script-helpers-2.40.5.min.js | 2 KB | — | ✓ | 3rd |
| https://www.20minutes.fr/js/cmp-2.40.5.min.js | 15 KB | — | ✓ | 3rd |
| https://www.20minutes.fr/js/piano-2.40.5.min.js | 7 KB | — | ✓ | 3rd |
| https://www.20minutes.fr/js/edgee-2.40.5.min.js | 1 KB | — | ✓ | 3rd |
| https://www.20minutes.fr/js/react-and-react-dom-2.40.5.min.js | 47 KB | — | ✓ | 3rd |
| https://www.20minutes.fr/js/ads-2.40.5.min.js | 14 KB | — | ✓ | 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
DPage Weight InventoryAction166 resources · 3.3 MB · 340 KB savings availableFIX
~340.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 166 resources | 3.3 MiB | ||||||
BImage Optimization104 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
BJS Execution Cost812ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.20minutes.fr/ | 363ms | 14ms | 1ms | 3rd |
| Unattributable | 279ms | 61ms | 0ms | 3rd |
| https://www.20minutes.fr/js/main-2.40.5.min.js | 105ms | 65ms | 29ms | 3rd |
| https://sdk.privacy-center.org/sdk/d4911c3d5b4b9a80b40e05167f53d1b1e8da81f3/modern/sdk.d4911c3d5b4b9a80b40e05167f53d1b1e8da81f3.js | 65ms | 52ms | 8ms | 3rd |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (38 KB)PASS
Web fonts
4
38 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
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)
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
AHTTP Cachingmax-age=30 (30 seconds)PASS
max-age=30, public
| Directive | Value | Meaning |
|---|---|---|
| max-age | 30 | Cache for 30 seconds |
| public | — | Any cache may store this response |
Network Waterfall166 requests over 1655msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.20minutes.fr www.20minutes.fr | Other | 363ms | 120 KB | — | €2/mo | Costly |
Unattributable Unattributable | Other | 279ms | 0 KB | — | €1/mo | Costly |
www.20minutes.fr www.20minutes.fr | Other | 105ms | 352 KB | 67% | €0/mo | Optional |
sdk.privacy-center.org sdk.privacy-center.org | Other | 65ms | 101 KB | 44% | €0/mo | Optional |
These scripts may cost more than they're worth
- www.20minutes.fr adds 363ms and costs ~€2/month
- Unattributable adds 279ms and costs ~€1/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.20minutes.fr takes 363ms 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 279ms 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
67% of www.20minutes.fr'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