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.
3.56 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
9.33 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.86 s
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.
5.57 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.
16.58 s
Page Load Progression
FPage Weight BudgetAction4.1 MB transferred, 109 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
FJS Execution CostAction6752ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.tf1.fr/_next/static/chunks/0al-8.v57oawb.js | 2955ms | 2530ms | 18ms | 3rd |
| https://www.tf1.fr/ | 1218ms | 120ms | 379ms | 3rd |
| Unattributable | 780ms | 122ms | 0ms | 3rd |
| https://compte.tf1.fr/js/gigya.js?apiKey=3_hWgJdARhz_7l1oOp3a8BDLoR9cuWZpUaKG4aqF7gum9_iK3uTZ2VlDBl8ANf8FVk | 361ms | 304ms | 50ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 298ms | 215ms | 28ms | 3rd |
| https://www.tf1.fr/_next/static/chunks/0zn7pqjfxvzkd.js | 229ms | 226ms | 2ms | 3rd |
| https://cdn.tagcommander.com/4183/tc_TF1_26.js | 228ms | 166ms | 58ms | 3rd |
| https://www.datadoghq-browser-agent.com/eu1/v6/datadog-rum.js | 168ms | 135ms | 12ms | 3rd |
| https://www.tf1.fr/_next/static/chunks/0pb97wfnovbch.js | 145ms | 24ms | 1ms | 3rd |
| https://connect.facebook.net/fr_FR/bundle/sdk.js/ | 139ms | 120ms | 18ms | 3rd |
Showing top 10 of 12 scripts
DJS BundlesAction48 scripts, 467 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://apis.google.com/_/scs/abc-static/_/js/k=gapi.lb.en.PJsh2cctCQI.O/m=client/rt=j/sv=1/d=1/ed=1/rs=AHpOoo_QlMhY2cycn60Rs8eI1WInRwuahw/cb=gapi.loaded_0?le=scs | 108 KB | 80 KB (74%) | ✓ | 3rd |
| https://cdn.tagcommander.com/4183/tc_TF1_26.js | 131 KB | 58 KB (64%) | ✓ | 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 | 23 KB (35%) | ✓ | 3rd |
| https://www.tf1.fr/_next/static/chunks/14kq5zpjd1x2~.js | 10 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 InventoryAction109 resources · 4.1 MB · 467 KB savings availableFIX
~467.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 109 resources | 4.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
AImage Optimization45 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 Hints9 hints, 0 missing preconnectsPASS
Current Resource Hints
9 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall109 requests over 2121msINFO
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 | 2955ms | 67 KB | 35% | €12/mo | Costly |
www.tf1.fr www.tf1.fr | Other | 1218ms | 399 KB | — | €5/mo | Costly |
Unattributable Unattributable | Other | 780ms | 0 KB | — | €3/mo | Costly |
compte.tf1.fr compte.tf1.fr | Other | 361ms | 239 KB | 59% | €2/mo | Costly |
sdk.privacy-center.org sdk.privacy-center.org | Other | 298ms | 102 KB | 43% | €1/mo | Costly |
www.tf1.fr www.tf1.fr | Other | 229ms | 8 KB | — | €1/mo | Costly |
cdn.tagcommander.com cdn.tagcommander.com | Other | 228ms | 131 KB | 64% | €1/mo | Costly |
www.datadoghq-browser-agent.com www.datadoghq-browser-agent.com | Other | 168ms | 58 KB | 51% | €1/mo | Optional |
www.tf1.fr www.tf1.fr | Other | 145ms | 8 KB | — | €1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 139ms | 78 KB | 63% | €1/mo | Optional |
sdk.privacy-center.org sdk.privacy-center.org | Other | 137ms | 55 KB | — | €1/mo | Optional |
apis.google.com apis.google.com | Other | 95ms | 108 KB | 74% | €0/mo | Optional |
These scripts may cost more than they're worth
- www.tf1.fr adds 2955ms and costs ~€12/month
- www.tf1.fr adds 1218ms and costs ~€5/month
- Unattributable adds 780ms and costs ~€3/month
- compte.tf1.fr adds 361ms and costs ~€2/month
- sdk.privacy-center.org adds 298ms and costs ~€1/month
- www.tf1.fr adds 229ms and costs ~€1/month
- cdn.tagcommander.com adds 228ms 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 2955ms 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 1218ms 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 780ms 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
compte.tf1.fr takes 361ms 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
sdk.privacy-center.org takes 298ms 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 229ms 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
cdn.tagcommander.com takes 228ms 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
64% 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
51% of www.datadoghq-browser-agent.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
63% of Facebook Pixel'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
74% of apis.google.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