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Performance

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

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

Mobile Desktop
34
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.

2.63 s

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

15.74 s

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

4.40 s

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

0.015

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

7.58 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.

23.63 s

Page Load Progression

588 ms
1.2 s
1.8 s
2.4 s
2.9 s
3.5 s
4.1 s
4.7 s
Checks
14
5 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.6 MB transferred, 218 requests
FIX
3.6 MB transferred, 218 requests
Warning::
Page weighs 10.4 MB (3.6 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 316 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 316 KB
Warning::
218 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.76 g CO2 per page load
3.6 MB / 2.4 MB budget
3.6 MB transferred
218 requests
0.76 g CO2 per page load
JavaScript 1.9 MiB 53%
Images 910.1 KiB 25%
Other 384.4 KiB 10%
CSS 315.7 KiB 9%
HTML 93.7 KiB 3%
Other 21.4 KiB 1%
Other 1.9 KiB 0%
Other 1.5 KiB 0%
Other 637 B 0%
Other 240 B 0%
Other 0 B 0%
Fonts 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
97% third-party, 0 ms blocking
FIX
97% third-party, 0 ms blocking
Warning::
Third-party code accounts for 97% of page weight (3.5 MiB of 3.6 MiB)
Info::
Third-party blocking time is low (0 ms)
97%
First-party Third-party
F
JS Execution Cost
Action
16124ms total JS execution
FIX
16124ms total JS execution
Warning::
https://www.airbnb.com/: 2810ms CPU time
Warning::
Unattributable: 2653ms CPU time
Warning::
https://a0.muscache.com/airbnb/static/packages/web...: 1467ms CPU time
Warning::
https://a0.muscache.com/airbnb/static/packages/web...: 1357ms CPU time
Warning::
https://a0.muscache.com/airbnb/static/packages/web...: 1081ms CPU time
Warning::
Third-party scripts: 13314ms (83% 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/2810ms1582ms6ms1st
Unattributable2653ms220ms0ms3rd
https://a0.muscache.com/airbnb/static/packages/web/common/01f5.12df2efd0d.js1467ms1099ms17ms3rd
https://a0.muscache.com/airbnb/static/packages/web/common/2f99.0f3cfcd6b1.js1357ms101ms23ms3rd
https://a0.muscache.com/airbnb/static/packages/web/en/2a6c.ca9ceafb88.js1081ms808ms5ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-46MK919ms807ms87ms3rd
https://a0.muscache.com/airbnb/static/packages/web/common/ecdc.7f5695f079.js909ms832ms50ms3rd
https://www.googletagmanager.com/gtag/js?id=G-2P6Q8PGG16&cx=c&gtm=4e6411586ms502ms73ms3rd
https://a0.muscache.com/airbnb/static/packages/web/en/frontend/core-guest-loop/apps/core-guest-spa/client.26d445c8b9.js513ms456ms52ms3rd
https://d0a7e.airbnb.com/tags.js481ms347ms17ms3rd

Showing top 10 of 30 scripts

D
JS Bundles
Action
79 scripts, 327 KB unused
FIX
79 scripts, 327 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2P6Q...: 62 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...: 32 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://a0.muscache.com/airbnb/static/packages/web...: 31 KB unused (86%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://a0.muscache.com/airbnb/static/packages/web...: 29 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 327 KB
327 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-2P6Q8PGG16&cx=c&gtm=4e6411163 KB62 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 KB32 KB (52%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/en/frontend/onboarding/components/actionTray/ActionTrayContainer.8be1dd9a2a.js36 KB31 KB (86%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/common/2f99.0f3cfcd6b1.js54 KB29 KB (56%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/common/ecdc.7f5695f079.js98 KB27 KB (28%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/en/frontend/stays-search/routes/StaysSearchRoute/StaysSearchRoute.4bead5e17b.js36 KB25 KB (70%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/en/6497.206771ab41.js36 KB24 KB (68%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/en/frontend/core-guest-loop/apps/core-guest-spa/client.26d445c8b9.js97 KB23 KB (24%)✓3rd
https://a0.muscache.com/airbnb/static/packages/web/en/b2b5.ee6a32d4d4.js38 KB21 KB (55%)✓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

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
72 images, 0 KB saveable
REVIEW
72 images, 0 KB saveable
Info::
All images are well-optimized
72 images 910 KB
0 oversized -0 KB
13 legacy format
0 missing dimensions CLS risk
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 2.6 s LCP 15.7 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
38 hints, 0 missing preconnects
PASS
38 hints, 0 missing preconnects
Info::
Page uses 38 resource hint(s)

Current Resource Hints

preconnect
—
preload
+28
38
dns-prefetch
—
prefetch
—

38 resource hints configured

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
83% of JavaScript execution is third-party
First-party Third-party 13314ms · 1529KB · $177/mo
Unattributable
Other
Costly
Execution 2653ms
Transfer 0 KB
Monthly Cost $35/mo
a0.muscache.com
Other
Costly
Execution 1467ms
Transfer 43 KB
Monthly Cost $19/mo
a0.muscache.com
Other
Costly
Execution 1357ms
Transfer 54 KB
Unused 56%
Monthly Cost $18/mo
a0.muscache.com
Other
Costly
Execution 1081ms
Transfer 12 KB
Monthly Cost $14/mo
Google Tag Manager
Tag Manager
Costly
Execution 919ms
Transfer 172 KB
Unused 30%
Monthly Cost $12/mo
a0.muscache.com
Other
Costly
Execution 909ms
Transfer 98 KB
Unused 28%
Monthly Cost $12/mo
Google Tag Manager
Tag Manager
Costly
Execution 586ms
Transfer 163 KB
Unused 38%
Monthly Cost $8/mo
a0.muscache.com
Other
Costly
Execution 513ms
Transfer 97 KB
Unused 24%
Monthly Cost $7/mo
d0a7e.airbnb.com
Other
Costly
Execution 481ms
Transfer 40 KB
Monthly Cost $6/mo
a0.muscache.com
Other
Costly
Execution 411ms
Transfer 5 KB
Monthly Cost $5/mo
a0.muscache.com
Other
Costly
Execution 318ms
Transfer 10 KB
Monthly Cost $4/mo
a0.muscache.com
Other
Costly
Execution 269ms
Transfer 47 KB
Monthly Cost $4/mo
a0.muscache.com
Other
Costly
Execution 254ms
Transfer 10 KB
Monthly Cost $3/mo
a0.muscache.com
Other
Costly
Execution 235ms
Transfer 316 KB
Monthly Cost $3/mo
a0.muscache.com
Other
Costly
Execution 233ms
Transfer 26 KB
Monthly Cost $3/mo
a0.muscache.com
Other
Costly
Execution 214ms
Transfer 52 KB
Monthly Cost $3/mo
a0.muscache.com
Other
Optional
Execution 183ms
Transfer 38 KB
Unused 55%
Monthly Cost $2/mo
a0.muscache.com
Other
Optional
Execution 154ms
Transfer 15 KB
Monthly Cost $2/mo
a0.muscache.com
Other
Optional
Execution 153ms
Transfer 30 KB
Monthly Cost $2/mo
a0.muscache.com
Other
Optional
Execution 151ms
Transfer 3 KB
Monthly Cost $2/mo
a0.muscache.com
Other
Optional
Execution 147ms
Transfer 19 KB
Monthly Cost $2/mo
a0.muscache.com
Other
Optional
Execution 115ms
Transfer 36 KB
Unused 86%
Monthly Cost $2/mo
a0.muscache.com
Other
Optional
Execution 112ms
Transfer 111 KB
Monthly Cost $1/mo
a0.muscache.com
Other
Optional
Execution 97ms
Transfer 36 KB
Unused 68%
Monthly Cost $1/mo
a0.muscache.com
Other
Optional
Execution 86ms
Transfer 21 KB
Monthly Cost $1/mo
a0.muscache.com
Other
Optional
Execution 56ms
Transfer 20 KB
Monthly Cost $1/mo
a0.muscache.com
Other
Optional
Execution 54ms
Transfer 22 KB
Monthly Cost $1/mo
a0.muscache.com
Other
Optional
Execution 54ms
Transfer 15 KB
Monthly Cost $1/mo
a0.muscache.com
Other
Optional
Execution 52ms
Transfer 18 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 2653ms and costs ~$35/month
  • a0.muscache.com adds 1467ms and costs ~$19/month
  • a0.muscache.com adds 1357ms and costs ~$18/month
  • a0.muscache.com adds 1081ms and costs ~$14/month
  • Google Tag Manager adds 919ms and costs ~$12/month
  • a0.muscache.com adds 909ms and costs ~$12/month
  • Google Tag Manager adds 586ms and costs ~$8/month
  • a0.muscache.com adds 513ms and costs ~$7/month
  • d0a7e.airbnb.com adds 481ms and costs ~$6/month
  • a0.muscache.com adds 411ms and costs ~$5/month
  • a0.muscache.com adds 318ms and costs ~$4/month
  • a0.muscache.com adds 269ms and costs ~$4/month
  • a0.muscache.com adds 254ms and costs ~$3/month
  • a0.muscache.com adds 235ms and costs ~$3/month
  • a0.muscache.com adds 233ms and costs ~$3/month
  • a0.muscache.com adds 214ms and costs ~$3/month

83% 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 2653ms 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 1467ms 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 1357ms 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

56% of a0.muscache.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

a0.muscache.com takes 1081ms 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 919ms 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 909ms 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 586ms 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 513ms 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

d0a7e.airbnb.com takes 481ms 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 411ms 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 318ms 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 269ms 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 254ms 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 235ms 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 233ms 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 214ms 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

55% of a0.muscache.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

86% of a0.muscache.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

68% of a0.muscache.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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