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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
88
GRADE
B
FIX
3
REVIEW
2
PASS
10
INFO
2

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

Mobile Desktop
84
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
73
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
88
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
82
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.

3.35 s

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

3.50 s

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

0 ms

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

0.000

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

3.35 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.

3.50 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
10 PASS 2 REVIEW 3 FIX
D
Third-Party Impact
Action
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (332.3 KiB of 335.9 KiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
D
JS Execution Cost
Action
2271ms total JS execution
FIX
2271ms total JS execution
Warning::
https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/NQY...: 1042ms CPU time
Warning::
https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/ObY...: 940ms CPU time
Warning::
Unattributable: 289ms CPU time
Warning::
Third-party scripts: 2271ms (100% of total)

Main Thread Breakdown

Script Evaluation 82% Other 11% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/NQYDXcaOuO/HABsaTcD/AUIVB/zx9PBgOAg?v=4aeb6819-012f-27c1-dad2-bf9c5c655435&t=6748355771042ms969ms42ms3rd
https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/ObYDXcaOuOb51a7t/UiJhaTcD/THwpC/mxybiEB940ms791ms40ms3rd
Unattributable289ms134ms0ms3rd
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
JS Bundles
4 scripts, 66 KB unused
REVIEW
4 scripts, 66 KB unused
Warning::
https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/ObY...: 35 KB unused (21%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/NQY...: 32 KB unused (21%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 66 KB
66 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/ObYDXcaOuOb51a7t/UiJhaTcD/THwpC/mxybiEB167 KB35 KB (21%)✓3rd
https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/NQYDXcaOuO/HABsaTcD/AUIVB/zx9PBgOAg?v=4aeb6819-012f-27c1-dad2-bf9c5c655435&t=674835577155 KB32 KB (21%)✓3rd
blob:https://www.aa.com/a6f28c9b-b55d-46f4-8aca-44b6fd5f3ba50 KB—✓3rd
blob:https://www.aa.com/50ad78ea-3594-4ea0-839e-40b13d14f2d50 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

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

Green Hosting

No green hosting detected

A+
Page Weight Budget
336 KB transferred, 12 requests
PASS
336 KB transferred, 12 requests
Info::
Page weighs 957 KB (336 KB transferred)
Info::
12 HTTP requests
Info::
Estimated 0.07 g CO2 per page load
336 KB / 2.4 MB budget
336 KB transferred
12 requests
0.07 g CO2 per page load
JavaScript 321.7 KiB 96%
Other 5.3 KiB 2%
HTML 4.9 KiB 1%
Other 4.1 KiB 1%
0 2.4 MB 4.9 MB
Under budget
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+
Image Optimization
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
A
Page Weight Inventory
12 resources · 336 KB · 66 KB savings available
PASS
12 resources · 336 KB · 66 KB savings available
Info::
Within 1MB page-weight target
Got: 336 KB
Info::
~66 KB of savings available
Warning::
11 third-party resources (99% of weight)
12 resources · 335.9 KiB · 11 third-party Within 1MB page-weight target
JavaScript 96% · 321.7 KiB
Other 2% · 7.6 KiB
Document 1% · 4.9 KiB
Image 1% · 1.7 KiB

~66.5 KiB of savings available

Remove unused JavaScript: 66.5 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
12 requests over 3402ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 3.4 s LCP 3.5 shttps://aa.com// https://aa.com/ — 301 — 3.6 KiB — 35 ms — http/1.1https://www.aa.com/www.aa.com/ https://www.aa.com/ — 200 — 2.9 KiB — 191 ms — h2https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/NQYDXcaOuO/HABsaTcD/AUIVB/zx9PBgOAg?v=4aeb6819-012f-27c1-dad2-bf9c5c655435&t=674835577www.aa.com/aWmazqVS/X4maUEs/7tRD1js... https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/NQYDXcaOuO/HABsaTcD/AUIVB/zx9PBgOAg?v=4aeb6819-012f-27c1-dad2-bf9c5c655435&t=674835577 — 200 — 154.9 KiB — 28 ms — h2https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/ObYDXcaOuOb51a7t/UiJhaTcD/THwpC/mxybiEBwww.aa.com/aWmazqVS/X4maUEs/7tRD1js... https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/ObYDXcaOuOb51a7t/UiJhaTcD/THwpC/mxybiEB — 200 — 166.8 KiB — 29 ms — h2https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/ObYDXcaOuOb51a7t/UiJhaTcD/THwpC/mxybiEBwww.aa.com/aWmazqVS/X4maUEs/7tRD1js... https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/ObYDXcaOuOb51a7t/UiJhaTcD/THwpC/mxybiEB — 201 — 1.7 KiB — 292 ms — h2https://www.aa.com/favicon.icowww.aa.com/favicon.ico https://www.aa.com/favicon.ico — 200 — 1.7 KiB — 24 ms — h2blob:https://www.aa.com/a6f28c9b-b55d-46f4-8aca-44b6fd5f3ba5www.aa.com/a6f28c9b-b55d-46f4-8aca-... blob:https://www.aa.com/a6f28c9b-b55d-46f4-8aca-44b6fd5f3ba5 — -1 — 0 B — 0 ms — blob:https://www.aa.com/50ad78ea-3594-4ea0-839e-40b13d14f2d5www.aa.com/50ad78ea-3594-4ea0-839e-... blob:https://www.aa.com/50ad78ea-3594-4ea0-839e-40b13d14f2d5 — -1 — 0 B — 0 ms — https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/ObYDXcaOuOb51a7t/UiJhaTcD/THwpC/mxybiEBwww.aa.com/aWmazqVS/X4maUEs/7tRD1js... https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/ObYDXcaOuOb51a7t/UiJhaTcD/THwpC/mxybiEB — 201 — 1.4 KiB — 278 ms — h2https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/NQYDXcaOuO/HABsaTcD/AUIVB/zx9PBgOAg?t=674835577www.aa.com/aWmazqVS/X4maUEs/7tRD1js... https://www.aa.com/aWmazqVS/X4maUEs/7tRD1js/zY/NQYDXcaOuO/HABsaTcD/AUIVB/zx9PBgOAg?t=674835577 — 200 — 1007 B — 110 ms — h2https://www.aa.com/www.aa.com/ https://www.aa.com/ — 403 — 2.0 KiB — 29 ms — h2https://www.aa.com/favicon.icowww.aa.com/favicon.ico https://www.aa.com/favicon.ico — 200 — 0 B — 1 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 2271ms · 156KB · $30/mo
www.aa.com
Other
Costly
Execution 1042ms
Transfer 155 KB
Unused 21%
Monthly Cost $14/mo
www.aa.com
Other
Costly
Execution 940ms
Transfer 1 KB
Unused 21%
Monthly Cost $12/mo
Unattributable
Other
Costly
Execution 289ms
Transfer 0 KB
Monthly Cost $4/mo

These scripts may cost more than they're worth

  • www.aa.com adds 1042ms and costs ~$14/month
  • www.aa.com adds 940ms and costs ~$12/month
  • Unattributable adds 289ms and costs ~$4/month

100% 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

www.aa.com takes 1042ms 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

www.aa.com takes 940ms 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

Unattributable takes 289ms 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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