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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
4
REVIEW
3
PASS
5
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
57
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

632 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

3.17 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

402 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.005

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.01 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.

4.66 s

Page Load Progression

649 ms
1.3 s
1.9 s
2.6 s
3.2 s
3.9 s
4.5 s
5.2 s
Checks
14
5 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 218 requests
FIX
3.0 MB transferred, 218 requests
Warning::
Page weighs 10.0 MB (3.0 MB transferred)
Warning::
JavaScript is 1.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.9 MB
Info::
CSS is 315 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 315 KB
Warning::
218 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.64 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
218 requests
0.64 g CO2 per page load
JavaScript 1.9 MiB 64%
Other 384.4 KiB 12%
CSS 314.7 KiB 10%
Images 301.8 KiB 10%
HTML 97.7 KiB 3%
Other 22.9 KiB 1%
Other 1.9 KiB 0%
Other 1.5 KiB 0%
Other 637 B 0%
Other 119 B 0%
Fonts 0 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

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.

Why this matters

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.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
96% third-party, 0 ms blocking
FIX
96% third-party, 0 ms blocking
Warning::
Third-party code accounts for 96% of page weight (2.9 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
96%
First-party Third-party
F
JS Execution Cost
Action
4095ms total JS execution
FIX
4095ms total JS execution
Warning::
https://www.airbnb.com/: 797ms CPU time
Warning::
Unattributable: 690ms CPU time
Warning::
https://a0.muscache.com/airbnb/static/packages/web...: 426ms CPU time
Warning::
https://a0.muscache.com/airbnb/static/packages/web...: 338ms CPU time
Warning::
https://a0.muscache.com/airbnb/static/packages/web...: 321ms CPU time
Warning::
Third-party scripts: 3298ms (81% of total)

Main Thread Breakdown

Script Evaluation 57% Other 23% Style & Layout 7% Script Parsing & Compilation 6% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://www.airbnb.com/797ms456ms1ms1st
Unattributable690ms48ms0ms3rd
https://a0.muscache.com/airbnb/static/packages/web/en/4ab0.5d19bb91ce.js426ms329ms2ms3rd
https://a0.muscache.com/airbnb/static/packages/web/common/2f99.0f3cfcd6b1.js338ms17ms6ms3rd
https://a0.muscache.com/airbnb/static/packages/web/common/01f5.12df2efd0d.js321ms244ms4ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-46MK267ms239ms22ms3rd
https://a0.muscache.com/airbnb/static/packages/web/common/ecdc.7f5695f079.js234ms216ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-2P6Q8PGG16&cx=c&gtm=4e6411h1156ms133ms18ms3rd
https://a0.muscache.com/airbnb/static/packages/web/en/cfe2.d4e669892f.js155ms136ms7ms3rd
https://d0a7e.airbnb.com/tags.js154ms116ms12ms3rd

Showing top 10 of 16 scripts

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store, max-age=0, private, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, max-age=0, private, must-revalidate

DirectiveValueMeaning
no-store—Never cache this response
max-age0Cache for 0 seconds
private—Only browser cache, not CDN/proxy
must-revalidate—Must recheck with server after expiry
B
Image Optimization
71 images, 0 KB saveable
REVIEW
71 images, 0 KB saveable
Info::
All images are well-optimized
71 images 302 KB
0 oversized -0 KB
12 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
83 scripts, 295 KB unused
REVIEW
83 scripts, 295 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2P6Q...: 63 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-46M...: 52 KB unused (30%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://a0.muscache.com/airbnb/static/packages/web...: 31 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://a0.muscache.com/airbnb/static/packages/web...: 27 KB unused (28%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://a0.muscache.com/airbnb/static/packages/web...: 27 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 295 KB
295 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-2P6Q8PGG16&cx=c&gtm=4e6411h1163 KB63 KB (38%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-46MK172 KB52 KB (30%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/en/cfe2.d4e669892f.js62 KB31 KB (49%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/common/ecdc.7f5695f079.js97 KB27 KB (28%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/en/6497.206771ab41.js36 KB27 KB (74%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/en/frontend/core-guest-loop/apps/core-guest-spa/client.26d445c8b9.js96 KB27 KB (28%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/en/frontend/stays-search/routes/StaysSearchRoute/StaysSearchRoute.4bead5e17b.js36 KB24 KB (69%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/common/2f99.0f3cfcd6b1.js53 KB24 KB (46%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/en/45b1.14058fde29.js55 KB20 KB (37%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/common/frontend/guest-header/query/HeaderQuery.prepare.5b4e02aad9.js3 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
1 fonts (0 KB)
PASS
1 fonts (0 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

0 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 632 ms LCP 3.2 shttps://a0.muscache.com/airbnb/static/airbnb-dls-web/build/fonts/cereal-variable/AirbnbCerealVF_W_Wght.8816d9e5c3b6a860636193e36b6ac4e4.woff2AirbnbCerealVF_W_Wght.8... https://a0.muscache.com/airbnb/static/airbnb-dls-web/build/fonts/cereal-variable/AirbnbCerealVF_W_Wght.8816d9e5c3b6a860636193e36b6ac4e4.woff2 — 0 B — 0 ms — font-display: swap
AirbnbCerealVF_W_Wght.8... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
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 Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
218 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
81% of JavaScript execution is third-party
First-party Third-party 3298ms · 1143KB · $44/mo
Unattributable
Other
Costly
Execution 690ms
Transfer 0 KB
Monthly Cost $9/mo
a0.muscache.com
Other
Costly
Execution 426ms
Transfer 19 KB
Monthly Cost $6/mo
a0.muscache.com
Other
Costly
Execution 338ms
Transfer 53 KB
Unused 46%
Monthly Cost $4/mo
a0.muscache.com
Other
Costly
Execution 321ms
Transfer 42 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 267ms
Transfer 172 KB
Unused 30%
Monthly Cost $4/mo
a0.muscache.com
Other
Costly
Execution 234ms
Transfer 97 KB
Unused 28%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 156ms
Transfer 163 KB
Unused 38%
Monthly Cost $2/mo
a0.muscache.com
Other
Optional
Execution 155ms
Transfer 62 KB
Unused 49%
Monthly Cost $2/mo
d0a7e.airbnb.com
Other
Optional
Execution 154ms
Transfer 40 KB
Monthly Cost $2/mo
a0.muscache.com
Other
Optional
Execution 143ms
Transfer 46 KB
Monthly Cost $2/mo
a0.muscache.com
Other
Optional
Execution 126ms
Transfer 96 KB
Unused 28%
Monthly Cost $2/mo
a0.muscache.com
Other
Optional
Execution 104ms
Transfer 4 KB
Monthly Cost $1/mo
a0.muscache.com
Other
Optional
Execution 64ms
Transfer 25 KB
Monthly Cost $1/mo
a0.muscache.com
Other
Optional
Execution 63ms
Transfer 9 KB
Monthly Cost $1/mo
a0.muscache.com
Other
Optional
Execution 56ms
Transfer 315 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 690ms and costs ~$9/month
  • a0.muscache.com adds 426ms and costs ~$6/month
  • a0.muscache.com adds 338ms and costs ~$4/month
  • a0.muscache.com adds 321ms and costs ~$4/month
  • Google Tag Manager adds 267ms and costs ~$4/month
  • a0.muscache.com adds 234ms and costs ~$3/month

81% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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

Unattributable takes 690ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

a0.muscache.com takes 426ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

a0.muscache.com takes 338ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

a0.muscache.com takes 321ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 267ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

a0.muscache.com takes 234ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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