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.
790 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
0 ms
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.013
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.43 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.
0 ms
Page Load Progression
DPage Weight BudgetAction2.2 MB transferred, 100 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2338ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.france.tv/ | 918ms | 43ms | 37ms | 3rd |
| https://www.france.tv/_next/static/chunks/0-kkveyz.tao8.js | 530ms | 449ms | 10ms | 3rd |
| Unattributable | 468ms | 91ms | 0ms | 3rd |
| https://www.france.tv/_next/static/chunks/0j15lq9f6jk8_.js | 148ms | 148ms | 0ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 108ms | 92ms | 15ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/ui-web-fr-web.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 103ms | 57ms | 11ms | 3rd |
| https://utiq.france.tv/utiqLoader.js | 62ms | 53ms | 6ms | 3rd |
DPage Weight InventoryAction100 resources · 2.2 MB · 0 KB savings availableFIX
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 100 resources | 2.2 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization48 images, 0 KB saveableREVIEW
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 Loading2 fonts (73 KB)PASS
Web fonts
2
73 KB total
Render-blocking
0
of 2
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+JS Bundles35 scripts, 0 KB unusedPASS
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://utiq.france.tv/utiqLoader.js | 41 KB | — | ✓ | 3rd |
| https://www.france.tv/_next/static/chunks/0j15lq9f6jk8_.js | 3 KB | — | ✓ | 3rd |
| https://www.france.tv/_next/static/chunks/0y-1z9_8uwr1o.js | 9 KB | — | ✓ | 3rd |
| https://www.france.tv/_next/static/chunks/0chjs8n~o0qf9.js | 9 KB | — | ✓ | 3rd |
| https://www.france.tv/_next/static/chunks/0-kkveyz.tao8.js | 69 KB | — | ✓ | 3rd |
| https://www.france.tv/_next/static/chunks/13~l3v61a953~.js | 29 KB | — | ✓ | 3rd |
| https://www.france.tv/_next/static/chunks/10k4zy97geweu.js | 9 KB | — | ✓ | 3rd |
| https://www.france.tv/_next/static/chunks/turbopack-11bj44dfjrd91.js | 4 KB | — | ✓ | 3rd |
| https://www.france.tv/_next/static/chunks/0eqw72mh9jazy.js | 20 KB | — | ✓ | 3rd |
| https://www.france.tv/_next/static/chunks/0jl~-gmw0osqz.js | 6 KB | — | ✓ | 3rd |
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall100 requests over 2540msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.france.tv www.france.tv | Other | 918ms | 257 KB | — | €15/mo | Costly |
www.france.tv www.france.tv | Other | 530ms | 69 KB | — | €8/mo | Costly |
Unattributable Unattributable | Other | 468ms | 0 KB | — | €7/mo | Costly |
www.france.tv www.france.tv | Other | 148ms | 3 KB | — | €2/mo | Optional |
sdk.privacy-center.org sdk.privacy-center.org | Other | 108ms | 101 KB | — | €2/mo | Optional |
sdk.privacy-center.org sdk.privacy-center.org | Other | 103ms | 54 KB | — | €2/mo | Optional |
utiq.france.tv utiq.france.tv | Other | 62ms | 41 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.france.tv adds 918ms and costs ~€15/month
- www.france.tv adds 530ms and costs ~€8/month
- Unattributable adds 468ms and costs ~€7/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.france.tv takes 918ms 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.france.tv takes 530ms 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 468ms 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