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.
2.93 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
34.78 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
618 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.
11.69 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.
37.07 s
Page Load Progression
FPage Weight BudgetAction11.0 MB transferred, 130 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
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
DJS Execution CostAction3342ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.info.gouv.fr/build/1289.1244c801.js | 850ms | 344ms | 1ms | 3rd |
| Unattributable | 836ms | 17ms | 0ms | 3rd |
| https://www.info.gouv.fr/build/7897.de64ec1a.js | 395ms | 376ms | 0ms | 3rd |
| https://www.info.gouv.fr/ | 393ms | 34ms | 2ms | 3rd |
| https://www.info.gouv.fr/cdn-cgi/challenge-platform/scripts/jsd/main.js | 282ms | 194ms | 2ms | 3rd |
| https://www.info.gouv.fr/build/app.84ffced8.js | 238ms | 198ms | 3ms | 3rd |
| https://www.info.gouv.fr/build/4741.1593a305.js | 159ms | 126ms | 7ms | 3rd |
| https://www.info.gouv.fr/build/8259.f0e69098.css | 69ms | 0ms | 0ms | 3rd |
| https://www.info.gouv.fr/static/js/keia.min.js | 67ms | 50ms | 16ms | 3rd |
| https://www.info.gouv.fr/build/tarteaucitron.6e8709be.js | 53ms | 52ms | 1ms | 3rd |
DPage Weight InventoryAction130 resources · 11.0 MB · 246 KB savings availableFIX
~246.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 130 resources | 11.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization72 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
CJS BundlesAction27 scripts, 246 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.info.gouv.fr/build/356.718d9dfe.js | 112 KB | 108 KB (97%) | ✓ | 3rd |
| https://www.info.gouv.fr/build/9056.eb9022e8.js | 109 KB | 98 KB (90%) | ✓ | 3rd |
| https://www.info.gouv.fr/static/js/keia.min.js | 53 KB | 41 KB (76%) | ✓ | 3rd |
| https://www.info.gouv.fr/build/4741.1593a305.js | 19 KB | — | ✓ | 3rd |
| https://www.info.gouv.fr/build/7404.d3c5a3be.js | 5 KB | — | ✓ | 3rd |
| https://www.info.gouv.fr/build/runtime.bd57273e.js | 2 KB | — | ✓ | 3rd |
| https://www.info.gouv.fr/build/657.2a97f199.js | 6 KB | — | ✓ | 3rd |
| https://www.info.gouv.fr/build/2551.832267a0.js | 3 KB | — | ✓ | 3rd |
| https://www.info.gouv.fr/build/4323.df7d4298.js | 3 KB | — | ✓ | 3rd |
| https://www.info.gouv.fr/build/5905.d2a634fb.js | 4 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
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 Loading6 fonts (218 KB)PASS
Web fonts
6
218 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
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 ~3 KB and ~6 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall130 requests over 2566msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.info.gouv.fr www.info.gouv.fr | Other | 850ms | 28 KB | — | €9/mo | Costly |
Unattributable Unattributable | Other | 836ms | 0 KB | — | €9/mo | Costly |
www.info.gouv.fr www.info.gouv.fr | Other | 395ms | 16 KB | — | €4/mo | Costly |
www.info.gouv.fr www.info.gouv.fr | Other | 393ms | 35 KB | — | €4/mo | Costly |
www.info.gouv.fr www.info.gouv.fr | Other | 282ms | 0 KB | — | €3/mo | Costly |
www.info.gouv.fr www.info.gouv.fr | Other | 238ms | 9 KB | — | €3/mo | Costly |
www.info.gouv.fr www.info.gouv.fr | Other | 159ms | 19 KB | — | €2/mo | Optional |
www.info.gouv.fr www.info.gouv.fr | Other | 69ms | 130 KB | — | €1/mo | Optional |
www.info.gouv.fr www.info.gouv.fr | Other | 67ms | 53 KB | 76% | €1/mo | Optional |
www.info.gouv.fr www.info.gouv.fr | Other | 53ms | 3 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.info.gouv.fr adds 850ms and costs ~€9/month
- Unattributable adds 836ms and costs ~€9/month
- www.info.gouv.fr adds 395ms and costs ~€4/month
- www.info.gouv.fr adds 393ms and costs ~€4/month
- www.info.gouv.fr adds 282ms and costs ~€3/month
- www.info.gouv.fr adds 238ms and costs ~€3/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.info.gouv.fr takes 850ms 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 836ms 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.info.gouv.fr takes 395ms 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.info.gouv.fr takes 393ms 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.info.gouv.fr takes 282ms 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.info.gouv.fr takes 238ms 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
76% of www.info.gouv.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