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.
2.29 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
13.17 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.92 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.021
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
7.57 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.
20.84 s
Page Load Progression
FPage Weight BudgetAction3.7 MB transferred, 218 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
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
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 CostAction13061ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.airbnb.com/ | 2978ms | 1623ms | 5ms | 3rd |
| Unattributable | 2098ms | 138ms | 0ms | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/common/2ce9.b07975b17d.js | 1476ms | 1171ms | 10ms | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/en/2a6c.ca9ceafb88.js | 850ms | 693ms | 3ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-46MK | 823ms | 704ms | 70ms | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/common/0a77.96fdfdbf95.js | 717ms | 76ms | 13ms | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/en/bf69.14f185730e.js | 515ms | 141ms | 11ms | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/common/c3cb.0b3de42380.js | 443ms | 375ms | 23ms | 3rd |
| https://d0a7e.airbnb.com/tags.js | 438ms | 314ms | 19ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-2P6Q8PGG16&cx=c>m=4e64f0 | 437ms | 358ms | 71ms | 3rd |
Showing top 10 of 26 scripts
DPage Weight InventoryAction218 resources · 3.7 MB · 295 KB savings availableFIX
~295.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 218 resources | 3.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization72 images, 0 KB saveableREVIEW
CJS BundlesAction79 scripts, 295 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=4e64f0 | 165 KB | 63 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-46MK | 176 KB | 52 KB (30%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/en/frontend/onboarding/components/actionTray/ActionTrayContainer.04321c2a15.js | 36 KB | 31 KB (86%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/common/0a77.96fdfdbf95.js | 53 KB | 29 KB (56%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/en/frontend/core-guest-loop/apps/core-guest-spa/client.fdb4f57252.js | 99 KB | 26 KB (26%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/en/frontend/stays-search/routes/StaysSearchRoute/StaysSearchRoute.331548e4a1.js | 36 KB | 24 KB (67%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/en/6497.465735c44e.js | 36 KB | 24 KB (68%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/en/cfe2.336203b1c1.js | 46 KB | 23 KB (51%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/common/c3cb.0b3de42380.js | 93 KB | 22 KB (24%) | ✓ | 3rd |
| https://a0.muscache.com/airbnb/static/packages/web/common/6c5e.835aefa818.js | 8 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+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 Hints40 hints, 0 missing preconnectsPASS
Current Resource Hints
40 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall218 requests over 16407msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.airbnb.com www.airbnb.com | Other | 2978ms | 95 KB | — | $40/mo | Costly |
Unattributable Unattributable | Other | 2098ms | 0 KB | — | $28/mo | Costly |
a0.muscache.com a0.muscache.com | Other | 1476ms | 42 KB | — | $20/mo | Costly |
a0.muscache.com a0.muscache.com | Other | 850ms | 12 KB | — | $11/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 823ms | 176 KB | 30% | $11/mo | Costly |
a0.muscache.com a0.muscache.com | Other | 717ms | 53 KB | 56% | $10/mo | Costly |
a0.muscache.com a0.muscache.com | Other | 515ms | 35 KB | — | $7/mo | Costly |
a0.muscache.com a0.muscache.com | Other | 443ms | 93 KB | 24% | $6/mo | Costly |
d0a7e.airbnb.com d0a7e.airbnb.com | Other | 438ms | 40 KB | — | $6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 437ms | 165 KB | 39% | $6/mo | Costly |
a0.muscache.com a0.muscache.com | Other | 339ms | 99 KB | 26% | $4/mo | Costly |
a0.muscache.com a0.muscache.com | Other | 279ms | 5 KB | — | $4/mo | Costly |
a0.muscache.com a0.muscache.com | Other | 270ms | 52 KB | — | $4/mo | Costly |
a0.muscache.com a0.muscache.com | Other | 238ms | 9 KB | — | $3/mo | Costly |
a0.muscache.com a0.muscache.com | Other | 177ms | 10 KB | — | $2/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 130ms | 312 KB | — | $2/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 116ms | 18 KB | — | $2/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 110ms | 20 KB | — | $1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 106ms | 17 KB | — | $1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 100ms | 13 KB | — | $1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 98ms | 3 KB | — | $1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 78ms | 27 KB | — | $1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 74ms | 29 KB | — | $1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 63ms | 16 KB | — | $1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 58ms | 111 KB | — | $1/mo | Optional |
a0.muscache.com a0.muscache.com | Other | 51ms | 16 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.airbnb.com adds 2978ms and costs ~$40/month
- Unattributable adds 2098ms and costs ~$28/month
- a0.muscache.com adds 1476ms and costs ~$20/month
- a0.muscache.com adds 850ms and costs ~$11/month
- Google Tag Manager adds 823ms and costs ~$11/month
- a0.muscache.com adds 717ms and costs ~$10/month
- a0.muscache.com adds 515ms and costs ~$7/month
- a0.muscache.com adds 443ms and costs ~$6/month
- d0a7e.airbnb.com adds 438ms and costs ~$6/month
- Google Tag Manager adds 437ms and costs ~$6/month
- a0.muscache.com adds 339ms and costs ~$4/month
- a0.muscache.com adds 279ms and costs ~$4/month
- a0.muscache.com adds 270ms and costs ~$4/month
- a0.muscache.com adds 238ms and costs ~$3/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.airbnb.com takes 2978ms 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 2098ms 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 1476ms 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 850ms 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 823ms 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 717ms 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
56% of a0.muscache.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
a0.muscache.com takes 515ms 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 443ms 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
d0a7e.airbnb.com takes 438ms 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 437ms 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 339ms 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 279ms 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 270ms 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 238ms 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