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.
773 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.79 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
605 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.011
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.75 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.
3.94 s
Page Load Progression
FPage Weight BudgetAction3.0 MB transferred, 179 requestsFIX
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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
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 CostAction4050ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://a0.muscache.com/airbnb/static/packages/web/common/564e.b2b34a82a2.js | 544ms | 405ms | 5ms | 3rd |
| Unattributable | 530ms | 42ms | 0ms | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/common/2ce9.aee8e73ff5.js | 519ms | 386ms | 5ms | 3rd |
| https://www.airbnb.fr/ | 487ms | 103ms | 2ms | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/common/4f8d.f846dfa32e.js | 347ms | 19ms | 6ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-46MK | 222ms | 196ms | 24ms | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/fr/45b1.ad3e8a7d51.js | 190ms | 166ms | 7ms | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/common/c3cb.0b3de42380.js | 155ms | 137ms | 12ms | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/fr/frontend/core-guest-loop/apps/core-guest-spa/client.6021e8d8f6.js | 143ms | 128ms | 14ms | 3rd |
| https://d0a7e.airbnb.com/tags.js | 135ms | 108ms | 4ms | 3rd |
Showing top 10 of 18 scripts
DPage Weight InventoryAction179 resources · 3.0 MB · 288 KB savings availableFIX
~287.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 179 resources | 3.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CJS BundlesAction82 scripts, 288 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-2P6Q8PGG16&cx=c>m=4e64e1h1 | 164 KB | 66 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-46MK | 175 KB | 55 KB (31%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/fr/frontend/core-guest-loop/apps/core-guest-spa/client.6021e8d8f6.js | 99 KB | 29 KB (29%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/fr/frontend/stays-search/routes/StaysSearchRoute/StaysSearchRoute.1f38274fe1.js | 36 KB | 25 KB (68%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/fr/6497.fc75b115a6.js | 36 KB | 24 KB (68%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/common/4f8d.f846dfa32e.js | 53 KB | 24 KB (46%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/common/c3cb.0b3de42380.js | 93 KB | 23 KB (25%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/fr/cfe2.97ba1f4311.js | 46 KB | 22 KB (48%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/fr/45b1.ad3e8a7d51.js | 55 KB | 20 KB (37%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/common/a6e1.9439b69ac3.js | 15 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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization57 images, 0 KB saveablePASS
A+Font Loading1 fonts (0 KB)PASS
Web fonts
1
0 KB total
Render-blocking
0
of 1
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 Waterfall179 requests over 7288msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
a0.muscache.com a0.muscache.com | Other | 544ms | 19 KB | — | €6/mo | Costly |
Unattributable Unattributable | Other | 530ms | 0 KB | — | €6/mo | Costly |
a0.muscache.com a0.muscache.com | Other | 519ms | 42 KB | — | €6/mo | Costly |
www.airbnb.fr www.airbnb.fr | Other | 487ms | 93 KB | — | €5/mo | Costly |
a0.muscache.com a0.muscache.com | Other | 347ms | 53 KB | 46% | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 222ms | 175 KB | 31% | €2/mo | Costly |
a0.muscache.com a0.muscache.com | Other | 190ms | 55 KB | 37% | €2/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 155ms | 93 KB | 25% | €2/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 143ms | 99 KB | 29% | €2/mo | Optional |
d0a7e.airbnb.com d0a7e.airbnb.com | Other | 135ms | 42 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 130ms | 164 KB | 40% | €1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 118ms | 16 KB | — | €1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 112ms | 35 KB | — | €1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 110ms | 5 KB | — | €1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 104ms | 9 KB | — | €1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 75ms | 52 KB | — | €1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 65ms | 19 KB | — | €1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 63ms | 313 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- a0.muscache.com adds 544ms and costs ~€6/month
- Unattributable adds 530ms and costs ~€6/month
- a0.muscache.com adds 519ms and costs ~€6/month
- www.airbnb.fr adds 487ms and costs ~€5/month
- a0.muscache.com adds 347ms and costs ~€4/month
- Google Tag Manager adds 222ms and costs ~€2/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
a0.muscache.com takes 544ms 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 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
a0.muscache.com takes 519ms 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.airbnb.fr takes 487ms 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
a0.muscache.com takes 347ms 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
Google Tag Manager takes 222ms 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