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.
2.56 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
25.18 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
863 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.008
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.56 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.
26.41 s
Page Load Progression
FPage Weight BudgetAction8.5 MB transferred, 88 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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction5919ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.free.fr/_next/static/chunks/framework-945b357d4a851f4b.js | 1500ms | 1084ms | 27ms | 3rd |
| https://www.free.fr/freebox | 1472ms | 4ms | 1ms | 3rd |
| Unattributable | 1317ms | 64ms | 0ms | 3rd |
| https://www.free.fr/_next/static/chunks/9287-818be36ecbda0ef2.js | 674ms | 231ms | 10ms | 3rd |
| https://sdk.privacy-center.org/sdk/ccd75f3fd1e3bfdd8b4938d8a0c206149f135f03/modern/sdk.ccd75f3fd1e3bfdd8b4938d8a0c206149f135f03.js | 287ms | 215ms | 48ms | 3rd |
| https://www.free.fr/_next/static/chunks/pages/_app-1fb0f6bd6170d9ed.js | 270ms | 206ms | 63ms | 3rd |
| https://sdk.privacy-center.org/sdk/ccd75f3fd1e3bfdd8b4938d8a0c206149f135f03/modern/ui-web-en-web.ccd75f3fd1e3bfdd8b4938d8a0c206149f135f03.js | 150ms | 92ms | 25ms | 3rd |
| https://www.free.fr/_next/static/chunks/pages/freebox-26820cbf50fe4406.js | 126ms | 109ms | 5ms | 3rd |
| https://www.free.fr/_next/static/chunks/main-961c6997f1de1abb.js | 125ms | 101ms | 21ms | 3rd |
DPage Weight InventoryAction88 resources · 8.5 MB · 105 KB savings availableFIX
~105.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 88 resources | 8.5 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction42 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
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
BJS Bundles20 scripts, 105 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://sdk.privacy-center.org/sdk/ccd75f3fd1e3bfdd8b4938d8a0c206149f135f03/modern/sdk.ccd75f3fd1e3bfdd8b4938d8a0c206149f135f03.js | 102 KB | 54 KB (53%) | ✓ | 3rd |
| https://www.free.fr/_next/static/chunks/pages/_app-1fb0f6bd6170d9ed.js | 164 KB | 51 KB (31%) | ✓ | 3rd |
| https://www.free.fr/_next/static/chunks/4886-7ccdba29ee1ff978.js | 7 KB | — | ✓ | 3rd |
| https://www.free.fr/_next/static/chunks/6915-5b0afa43e3db5fce.js | 4 KB | — | ✓ | 3rd |
| https://www.free.fr/_next/static/chunks/framework-945b357d4a851f4b.js | 44 KB | — | ✓ | 3rd |
| https://www.free.fr/_next/static/chunks/c16184b3-d1c155136a7c92d1.js | 1 KB | — | ✓ | 3rd |
| https://www.free.fr/_next/static/chunks/3679-a9a4da3915b4fda3.js | 13 KB | — | ✓ | 3rd |
| https://www.free.fr/_next/static/chunks/9359-b953d6c4c53cdadf.js | 10 KB | — | ✓ | 3rd |
| https://www.free.fr/_next/static/chunks/9603-6678331badd40003.js | 19 KB | — | ✓ | 3rd |
| https://www.free.fr/_next/static/chunks/9287-818be36ecbda0ef2.js | 31 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
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 Loading8 fonts (598 KB)PASS
Web fonts
8
598 KB total
Render-blocking
0
of 8
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
- 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 ~185 KB and ~370 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints5 hints, 0 missing preconnectsPASS
Current Resource Hints
5 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall88 requests over 4084msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.free.fr www.free.fr | Other | 1500ms | 44 KB | — | €6/mo | Costly |
www.free.fr www.free.fr | Other | 1472ms | 32 KB | — | €6/mo | Costly |
Unattributable Unattributable | Other | 1317ms | 0 KB | — | €6/mo | Costly |
www.free.fr www.free.fr | Other | 674ms | 31 KB | — | €3/mo | Costly |
sdk.privacy-center.org sdk.privacy-center.org | Other | 287ms | 102 KB | 53% | €1/mo | Costly |
www.free.fr www.free.fr | Other | 270ms | 164 KB | 31% | €1/mo | Costly |
sdk.privacy-center.org sdk.privacy-center.org | Other | 150ms | 54 KB | — | €1/mo | Optional |
www.free.fr www.free.fr | Other | 126ms | 14 KB | — | €1/mo | Optional |
www.free.fr www.free.fr | Other | 125ms | 40 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.free.fr adds 1500ms and costs ~€6/month
- www.free.fr adds 1472ms and costs ~€6/month
- Unattributable adds 1317ms and costs ~€6/month
- www.free.fr adds 674ms and costs ~€3/month
- sdk.privacy-center.org adds 287ms and costs ~€1/month
- www.free.fr adds 270ms 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.free.fr takes 1500ms 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.free.fr takes 1472ms 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 1317ms 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.free.fr takes 674ms 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
sdk.privacy-center.org takes 287ms 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
53% of sdk.privacy-center.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
www.free.fr takes 270ms 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