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.
1.04 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.70 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
118 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.
2.51 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.
3.74 s
Page Load Progression
741 ms
1.5 s
2.2 s 3.0 s
3.7 s
4.4 s
5.2 s
5.9 sFPage Weight BudgetAction5.6 MB transferred, 262 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
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
FJS Execution CostAction3593ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.bfmtv.com/ | 1025ms | 59ms | 10ms | 3rd |
| Unattributable | 837ms | 19ms | 0ms | 3rd |
| https://players.brightcove.net/876450610001/ddff4JxPe_default/index.min.js | 672ms | 253ms | 32ms | 3rd |
| https://www.bfmtv.com/assets/v20/js/videoLoader.7eb3610047c665499cbd.js | 314ms | 173ms | 2ms | 3rd |
| https://www.datadoghq-browser-agent.com/eu1/v6/datadog-rum.js | 243ms | 193ms | 8ms | 3rd |
| https://www.bfmtv.com/assets/v20/js/global.4b0bd62b2efb6f1bfffa.js | 115ms | 43ms | 25ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 112ms | 91ms | 14ms | 3rd |
| https://utiq.bfmtv.com/utiqLoader.js | 84ms | 71ms | 8ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/ui-web-en-web.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 69ms | 43ms | 9ms | 3rd |
| https://via.batch.com/3.5.0/sdk.min.js | 63ms | 46ms | 9ms | 3rd |
Showing top 10 of 11 scripts
DJS BundlesAction25 scripts, 454 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.bfmtv.com/assets/v20/js/global.4b0bd62b2efb6f1bfffa.js | 194 KB | 167 KB (86%) | ✓ | 3rd |
| https://imasdk.googleapis.com/js/sdkloader/ima3.js | 147 KB | 108 KB (74%) | ✓ | 3rd |
| https://players.brightcove.net/876450610001/ddff4JxPe_default/index.min.js | 224 KB | 90 KB (40%) | ✓ | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 102 KB | 44 KB (43%) | ✓ | 3rd |
| https://www.bfmtv.com/assets/v20/js/sliderVertical.a4fee3c66da7fc42e6da.js | 38 KB | 23 KB (60%) | ✓ | 3rd |
| https://utiq.bfmtv.com/utiqLoader.js | 41 KB | 22 KB (54%) | ✓ | 3rd |
| https://www.bfmtv.com/assets/v20/js/tc_NextInteractive_33.1d56d121256525ac5f6cfd632ee1b6a0.js | 15 KB | — | ✓ | 3rd |
| https://via.batch.com/3.5.0/sdk.min.js | 28 KB | — | ✓ | 3rd |
| https://ced-ns.sascdn.com/diff/js/smart.js | 19 KB | — | ✓ | 3rd |
| https://www.bfmtv.com/assets/v20/js/videoLoader.7eb3610047c665499cbd.js | 18 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 InventoryAction262 resources · 5.6 MB · 454 KB savings availableFIX
~454.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 262 resources | 5.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization203 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 (363 KB)PASS
Web fonts
2
363 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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
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 ~177 KB and ~354 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall262 requests over 3716msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.bfmtv.com www.bfmtv.com | Other | 1025ms | 108 KB | — | €5/mo | Costly |
Unattributable Unattributable | Other | 837ms | 0 KB | — | €4/mo | Costly |
players.brightcove.net players.brightcove.net | Other | 672ms | 224 KB | 40% | €4/mo | Costly |
www.bfmtv.com www.bfmtv.com | Other | 314ms | 18 KB | — | €2/mo | Costly |
www.datadoghq-browser-agent.com www.datadoghq-browser-agent.com | Other | 243ms | 58 KB | — | €1/mo | Costly |
www.bfmtv.com www.bfmtv.com | Other | 115ms | 194 KB | 86% | €1/mo | Optional |
sdk.privacy-center.org sdk.privacy-center.org | Other | 112ms | 102 KB | 43% | €1/mo | Optional |
utiq.bfmtv.com utiq.bfmtv.com | Other | 84ms | 41 KB | 54% | €0/mo | Optional |
sdk.privacy-center.org sdk.privacy-center.org | Other | 69ms | 53 KB | — | €0/mo | Optional |
via.batch.com via.batch.com | Other | 63ms | 28 KB | — | €0/mo | Optional |
www.bfmtv.com www.bfmtv.com | Other | 58ms | 38 KB | 60% | €0/mo | Optional |
These scripts may cost more than they're worth
- www.bfmtv.com adds 1025ms and costs ~€5/month
- Unattributable adds 837ms and costs ~€4/month
- players.brightcove.net adds 672ms and costs ~€4/month
- www.bfmtv.com adds 314ms and costs ~€2/month
- www.datadoghq-browser-agent.com adds 243ms 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.bfmtv.com takes 1025ms 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 837ms 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
players.brightcove.net takes 672ms 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.bfmtv.com takes 314ms 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.datadoghq-browser-agent.com takes 243ms 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
86% of www.bfmtv.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
54% of utiq.bfmtv.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
60% of www.bfmtv.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