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.
814 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.81 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
131 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.71 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.
2.80 s
Page Load Progression
FPage Weight BudgetAction4.9 MB transferred, 123 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 BundlesAction47 scripts, 492 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://compte.tf1.fr/js/gigya.js?apiKey=3_hWgJdARhz_7l1oOp3a8BDLoR9cuWZpUaKG4aqF7gum9_iK3uTZ2VlDBl8ANf8FVk | 239 KB | 141 KB (59%) | ✓ | 3rd |
| https://cdn.tagcommander.com/4183/tc_TF1_26.js | 131 KB | 82 KB (63%) | ✓ | 3rd |
| https://apis.google.com/_/scs/abc-static/_/js/k=gapi.lb.en.HLcjcliCxoY.O/m=client/rt=j/sv=1/d=1/ed=1/rs=AHpOoo-EKlLcELGvY6Qdg_kTBmN3Ra8MLw/cb=gapi.loaded_0?le=scs | 108 KB | 80 KB (74%) | ✓ | 3rd |
| https://connect.facebook.net/fr_FR/bundle/sdk.js/ | 78 KB | 49 KB (63%) | ✓ | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 102 KB | 44 KB (43%) | ✓ | 3rd |
| https://www.tf1.fr/_next/static/chunks/0o2dkbmk34sx-.js | 55 KB | 41 KB (81%) | ✓ | 3rd |
| https://www.datadoghq-browser-agent.com/eu1/v6/datadog-rum.js | 58 KB | 30 KB (51%) | ✓ | 3rd |
| https://www.tf1.fr/_next/static/chunks/0al-8.v57oawb.js | 67 KB | 25 KB (38%) | ✓ | 3rd |
| https://www.tf1.fr/_next/static/chunks/13pj10yf1nr5l.js | 25 KB | — | ✓ | 3rd |
| https://www.tf1.fr/_next/static/chunks/0wcjduua._6ng.js | 25 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
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 InventoryAction123 resources · 4.9 MB · 492 KB savings availableFIX
~492.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 123 resources | 4.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CJS Execution CostAction1421ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.tf1.fr/_next/static/chunks/0al-8.v57oawb.js | 610ms | 527ms | 5ms | 3rd |
| https://www.tf1.fr/ | 349ms | 36ms | 101ms | 3rd |
| Unattributable | 245ms | 35ms | 0ms | 3rd |
| https://compte.tf1.fr/js/gigya.js?apiKey=3_hWgJdARhz_7l1oOp3a8BDLoR9cuWZpUaKG4aqF7gum9_iK3uTZ2VlDBl8ANf8FVk | 105ms | 91ms | 11ms | 3rd |
| https://cdn.tagcommander.com/4183/tc_TF1_26.js | 58ms | 44ms | 13ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 55ms | 45ms | 10ms | 3rd |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
AImage Optimization59 images, 0 KB saveablePASS
A+Font Loading3 fonts (59 KB)PASS
Web fonts
3
59 KB total
Render-blocking
0
of 3
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
Network Waterfall123 requests over 4871msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.tf1.fr www.tf1.fr | Other | 610ms | 67 KB | 38% | €3/mo | Costly |
www.tf1.fr www.tf1.fr | Other | 349ms | 399 KB | — | €1/mo | Costly |
Unattributable Unattributable | Other | 245ms | 0 KB | — | €1/mo | Costly |
compte.tf1.fr compte.tf1.fr | Other | 105ms | 239 KB | 59% | €0/mo | Optional |
cdn.tagcommander.com cdn.tagcommander.com | Other | 58ms | 131 KB | 63% | €0/mo | Optional |
sdk.privacy-center.org sdk.privacy-center.org | Other | 55ms | 102 KB | 43% | €0/mo | Optional |
These scripts may cost more than they're worth
- www.tf1.fr adds 610ms and costs ~€3/month
- www.tf1.fr adds 349ms and costs ~€1/month
- Unattributable adds 245ms 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.tf1.fr takes 610ms 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.tf1.fr takes 349ms 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 245ms 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
59% of compte.tf1.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
63% of cdn.tagcommander.com'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