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https://americanexpress.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
2
REVIEW
5
PASS
6
INFO
2

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

Mobile Desktop
96
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

965 ms

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

1.19 s

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

20 ms

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

0.004

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

1.21 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.

1.51 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
15
6 PASS 5 REVIEW 2 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (1.3 MiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
Page Weight Budget
1.3 MB transferred, 77 requests
REVIEW
1.3 MB transferred, 77 requests
Info::
Page weighs 4.0 MB (1.3 MB transferred)
Warning::
JavaScript is 817 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 817 KB
Info::
77 HTTP requests
Info::
Estimated 0.26 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
77 requests
0.26 g CO2 per page load
JavaScript 817.4 KiB 63%
Images 171.9 KiB 13%
Fonts 126.2 KiB 10%
HTML 98.9 KiB 8%
CSS 57.1 KiB 4%
Other 5.7 KiB 0%
Other 5.5 KiB 0%
Other 4.5 KiB 0%
0 2.4 MB 4.9 MB
Under 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

C
Image Optimization
Action
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://www.aexp-static.com/cdaas/one/statics/axp-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.aexp-static.com/cdaas/one/statics/axp-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.americanexpress.com/content/dam/amex/e... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.aexp-static.com/cdaas/one/statics/@ame... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.americanexpress.com/content/dam/amex/e... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.americanexpress.com/content/dam/amex/e... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.americanexpress.com/content/dam/amex/e... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 172 KB
0 oversized -0 KB
6 legacy format
7 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Bundles
Action
30 scripts, 196 KB unused
REVIEW
30 scripts, 196 KB unused
Warning::
https://www.americanexpress.com/etc.clientlibs/ent...: 114 KB unused (85%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.americanexpress.com/PqryjIvWSxIXnk07kI...: 36 KB unused (21%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.aexp-static.com/cdaas/one/statics/@ame...: 24 KB unused (94%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.aexp-static.com/cdaas/one/statics/@ame...: 22 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 196 KB
196 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.americanexpress.com/etc.clientlibs/enterprise/clientlibs/enterprise.min.js135 KB114 KB (85%)✓3rd
https://www.americanexpress.com/PqryjIvWSxIXnk07kIPf/YOYubXhcSYLp8DLa1m/MBUmAQ/JXZbB/G1NWTIB172 KB36 KB (21%)✓3rd
https://www.aexp-static.com/cdaas/one/statics/@americanexpress/dls/6.23.1/package/dist/6.23.1/scripts/dls.min.js26 KB24 KB (94%)✓3rd
https://www.aexp-static.com/cdaas/one/statics/@americanexpress/homepage-frontend/3.17.9/package/dist/E3/markets/es-es/app_top.js?cb=1112350316202634 KB22 KB (68%)✓3rd
https://www.aexp-static.com/cdaas/one-tag/tagging/entrypoints/v1.319.0/entrypoint-15983.js25 KB—✓3rd
https://www.aexp-static.com/cdaas/one-tag/tagging/groups/group-747/v1.319.0/sri-hashes.js63 KB—✓3rd
https://www.aexp-static.com/cdaas/one/statics/@americanexpress/homepage-frontend/3.17.9/package/dist/E3/markets/es-es/app_bottom.js?cb=111235031620262 KB—✓3rd
https://www.americanexpress.com/akam/13/4854a19b10 KB—✓3rd
https://www.aexp-static.com/akamai/one/statics/@americanexpress/dls-icons/0.5.0/package/dist/browser/dls-icons.min.js102 KB—✓3rd
https://www.americanexpress.com/etc.clientlibs/homepage/clientlibs/homepage.min.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

C
Page Weight Inventory
Action
77 resources · 1.3 MB · 196 KB savings available
REVIEW
77 resources · 1.3 MB · 196 KB savings available
Warning::
Page weight 263 KB over 1MB target
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~196 KB of savings available
Warning::
76 third-party resources (100% of weight)
77 resources · 1.3 MiB · 76 third-party 263.3 KiB over 1MB target
JavaScript 63% · 817.4 KiB
Image 13% · 173.5 KiB
Font 10% · 126.2 KiB
Document 8% · 101.0 KiB
CSS 4% · 57.1 KiB
Other 1% · 12.0 KiB

~195.8 KiB of savings available

Remove unused JavaScript: 195.8 KiB
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+
JS Execution Cost
486ms total JS execution
PASS
486ms total JS execution
Info::
https://www.americanexpress.com/PqryjIvWSxIXnk07kI...: 177ms CPU time
Info::
Unattributable: 165ms CPU time
Info::
https://www.americanexpress.com/es-es/: 144ms CPU time
Warning::
Third-party scripts: 486ms (100% of total)

Main Thread Breakdown

Script Evaluation 48% Other 19% Style & Layout 13% Script Parsing & Compilation 8% Garbage Collection 6% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.americanexpress.com/PqryjIvWSxIXnk07kIPf/YOYubXhcSYLp8DLa1m/MBUmAQ/JXZbB/G1NWTIB177ms163ms11ms3rd
Unattributable165ms8ms0ms3rd
https://www.americanexpress.com/es-es/144ms2ms1ms3rd
A+
Font Loading
3 fonts (126 KB)
PASS
3 fonts (126 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

126 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 965 ms LCP 1.2 shttps://www.aexp-static.com/cdaas/one/statics/@americanexpress/dls-fonts/1.2.0/package/dist/fonts/42656e74-6f6e-2053-616e-7320426f6c64-3.woff242656e74-6f6e-2053-616e... https://www.aexp-static.com/cdaas/one/statics/@americanexpress/dls-fonts/1.2.0/package/dist/fonts/42656e74-6f6e-2053-616e-7320426f6c64-3.woff2 — 21.2 KiB — 35 ms — font-display: swaphttps://www.aexp-static.com/cdaas/one/statics/@americanexpress/static-assets/2.27.0/package/dist/fonts/325e6ad0-38fb-4bad-861c-d965eab101d5-3.woff325e6ad0-38fb-4bad-861c... https://www.aexp-static.com/cdaas/one/statics/@americanexpress/static-assets/2.27.0/package/dist/fonts/325e6ad0-38fb-4bad-861c-d965eab101d5-3.woff — 68.4 KiB — 35 ms — font-display: swaphttps://www.aexp-static.com/cdaas/one/statics/@americanexpress/static-assets/2.27.0/package/dist/fonts/3be50273-0b2e-4aef-ae68-882eacd611f9-3.woff3be50273-0b2e-4aef-ae68... https://www.aexp-static.com/cdaas/one/statics/@americanexpress/static-assets/2.27.0/package/dist/fonts/3be50273-0b2e-4aef-ae68-882eacd611f9-3.woff — 36.6 KiB — 33 ms — font-display: swap
42656e74-6f6e-2053-616e... woff2 swap
Size 21 KB
Load time 35 ms
Start 405 ms
Risk FOUT — text flashes from fallback to web font
325e6ad0-38fb-4bad-861c... woff swap
Size 68 KB
Load time 35 ms
Start 405 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
3be50273-0b2e-4aef-ae68... woff swap
Size 37 KB
Load time 33 ms
Start 406 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~32 KB and ~64 ms

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
77 requests over 2112ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 965 ms LCP 1.2 shttps://americanexpress.com// https://americanexpress.com/ — 301 — 1.4 KiB — 78 ms — http/1.1https://www.americanexpress.com/www.americanexpress.com/ https://www.americanexpress.com/ — 302 — 1.5 KiB — 57 ms — h2https://www.americanexpress.com/es/www.americanexpress.com/es/ https://www.americanexpress.com/es/ — 301 — 1.3 KiB — 20 ms — h2https://www.americanexpress.com/es-es/www.americanexpress.com/es-es/ https://www.americanexpress.com/es-es/ — 200 — 96.6 KiB — 60 ms — h2https://www.aexp-static.com/cdaas/one/statics/@americanexpress/dls/6.23.1/package/dist/6.23.1/styles/dls.min.csswww.aexp-static.com/cdaas/one/stati... https://www.aexp-static.com/cdaas/one/statics/@americanexpress/dls/6.23.1/package/dist/6.23.1/styles/dls.min.css — 200 — 46.9 KiB — 42 ms — h2https://www.aexp-static.com/cdaas/one/statics/@americanexpress/homepage-frontend/3.17.9/package/dist/E3/markets/es-es/app.css?cb=11123503162026www.aexp-static.com/cdaas/one/stati... https://www.aexp-static.com/cdaas/one/statics/@americanexpress/homepage-frontend/3.17.9/package/dist/E3/markets/es-es/app.css?cb=11123503162026 — 200 — 7.4 KiB — 79 ms — h2https://www.americanexpress.com/etc.clientlibs/homepage/clientlibs/core-homepage/styles.min.csswww.americanexpress.com/etc.clientl... https://www.americanexpress.com/etc.clientlibs/homepage/clientlibs/core-homepage/styles.min.css — 200 — 2.8 KiB — 22 ms — h2https://www.aexp-static.com/cdaas/one/statics/axp-static-assets/1.8.0/package/dist/img/logos/dls-logo-bluebox-solid.svgwww.aexp-static.com/cdaas/one/stati... https://www.aexp-static.com/cdaas/one/statics/axp-static-assets/1.8.0/package/dist/img/logos/dls-logo-bluebox-solid.svg — 200 — 1.7 KiB — 71 ms — h2https://www.aexp-static.com/cdaas/one/statics/axp-static-assets/1.8.0/package/dist/img/logos/dls-logo-stack.svgwww.aexp-static.com/cdaas/one/stati... https://www.aexp-static.com/cdaas/one/statics/axp-static-assets/1.8.0/package/dist/img/logos/dls-logo-stack.svg — 200 — 1.4 KiB — 80 ms — h2https://www.aexp-static.com/cdaas/one/statics/axp-static-assets/1.8.0/package/dist/img/logos/dls-logo-stack-white.svgwww.aexp-static.com/cdaas/one/stati... https://www.aexp-static.com/cdaas/one/statics/axp-static-assets/1.8.0/package/dist/img/logos/dls-logo-stack-white.svg — 200 — 1.4 KiB — 37 ms — h2https://icm.aexp-static.com/content/Navigation/Partials/prod/headerScript.jsicm.aexp-static.com/content/Navigat... https://icm.aexp-static.com/content/Navigation/Partials/prod/headerScript.js — 200 — 3.1 KiB — 49 ms — h2https://www.aexp-static.com/akamai/one/statics/@americanexpress/dls-icons/0.5.0/package/dist/browser/dls-icons.min.jswww.aexp-static.com/akamai/one/stat... https://www.aexp-static.com/akamai/one/statics/@americanexpress/dls-icons/0.5.0/package/dist/browser/dls-icons.min.js — 200 — 102.1 KiB — 377 ms — h2https://www.americanexpress.com/PqryjIvWSxIXnk07kIPf/YOYubXhcSYLp8DLa1m/MBUmAQ/JXZbB/G1NWTIBwww.americanexpress.com/PqryjIvWSxI... https://www.americanexpress.com/PqryjIvWSxIXnk07kIPf/YOYubXhcSYLp8DLa1m/MBUmAQ/JXZbB/G1NWTIB — 200 — 172.3 KiB — 23 ms — h2https://www.aexp-static.com/cdaas/one/statics/@americanexpress/homepage-frontend/3.17.9/package/dist/E3/markets/es-es/app_top.js?cb=11123503162026www.aexp-static.com/cdaas/one/stati... https://www.aexp-static.com/cdaas/one/statics/@americanexpress/homepage-frontend/3.17.9/package/dist/E3/markets/es-es/app_top.js?cb=11123503162026 — 200 — 33.5 KiB — 89 ms — h2https://www.americanexpress.com/akam/13/4854a19bwww.americanexpress.com/akam/13/485... https://www.americanexpress.com/akam/13/4854a19b — 200 — 9.5 KiB — 37 ms — h2https://www.aexp-static.com/cdaas/one/statics/@americanexpress/static-assets/2.32.1/package/dist/img/flags/dls-flag-es.svgwww.aexp-static.com/cdaas/one/stati... https://www.aexp-static.com/cdaas/one/statics/@americanexpress/static-assets/2.32.1/package/dist/img/flags/dls-flag-es.svg — 200 — 11.6 KiB — 85 ms — h2https://www.americanexpress.com/content/dam/amex/es-es/homepage/cards/spain-homepage-prospects-prodfilter-platinum.pngwww.americanexpress.com/content/dam... https://www.americanexpress.com/content/dam/amex/es-es/homepage/cards/spain-homepage-prospects-prodfilter-platinum.png — 200 — 1.3 KiB — 40 ms — h2https://www.americanexpress.com/content/dam/amex/es/tarjetas/chg_gold_metal_es_no_cm_160x101.pngwww.americanexpress.com/content/dam... https://www.americanexpress.com/content/dam/amex/es/tarjetas/chg_gold_metal_es_no_cm_160x101.png — 200 — 4.4 KiB — 43 ms — h2https://www.americanexpress.com/content/dam/amex/es-es/homepage/cards/spain-homepage-prospects-prodfilter-renfe.pngwww.americanexpress.com/content/dam... https://www.americanexpress.com/content/dam/amex/es-es/homepage/cards/spain-homepage-prospects-prodfilter-renfe.png — 200 — 2.1 KiB — 44 ms — h2https://www.americanexpress.com/content/dam/amex/es-es/negocios/sbs_plat_metal_es_no_cm_480x304.pngwww.americanexpress.com/content/dam... https://www.americanexpress.com/content/dam/amex/es-es/negocios/sbs_plat_metal_es_no_cm_480x304.png — 200 — 36.0 KiB — 46 ms — h2https://www.americanexpress.com/content/dam/amex/es-es/homepage/promo/spain-homepage-prospects-promo1-corporate.jpgwww.americanexpress.com/content/dam... https://www.americanexpress.com/content/dam/amex/es-es/homepage/promo/spain-homepage-prospects-promo1-corporate.jpg — 200 — 9.6 KiB — 47 ms — h2https://www.americanexpress.com/content/dam/amex/es-es/homepage/APT_400X130.jpgwww.americanexpress.com/content/dam... https://www.americanexpress.com/content/dam/amex/es-es/homepage/APT_400X130.jpg — 200 — 9.5 KiB — 48 ms — h2https://icm.aexp-static.com/content/Navigation/Partials/prod/footerScript.jsicm.aexp-static.com/content/Navigat... https://icm.aexp-static.com/content/Navigation/Partials/prod/footerScript.js — 200 — 927 B — 33 ms — h2https://www.aexp-static.com/cdaas/one/statics/axp-static-assets/1.7.1/package/dist/img/logos/dls-logo-line.svgwww.aexp-static.com/cdaas/one/stati... https://www.aexp-static.com/cdaas/one/statics/axp-static-assets/1.7.1/package/dist/img/logos/dls-logo-line.svg — 200 — 1.4 KiB — 84 ms — h2https://www.aexp-static.com/cdaas/one/statics/@americanexpress/homepage-frontend/3.17.9/package/dist/E3/markets/es-es/app_bottom.js?cb=11123503162026www.aexp-static.com/cdaas/one/stati... https://www.aexp-static.com/cdaas/one/statics/@americanexpress/homepage-frontend/3.17.9/package/dist/E3/markets/es-es/app_bottom.js?cb=11123503162026 — 200 — 1.9 KiB — 85 ms — h2https://www.aexp-static.com/cdaas/one/statics/@americanexpress/dls/6.23.1/package/dist/6.23.1/scripts/dls.min.jswww.aexp-static.com/cdaas/one/stati... https://www.aexp-static.com/cdaas/one/statics/@americanexpress/dls/6.23.1/package/dist/6.23.1/scripts/dls.min.js — 200 — 26.0 KiB — 87 ms — h2https://www.americanexpress.com/etc.clientlibs/enterprise/clientlibs/enterprise.min.jswww.americanexpress.com/etc.clientl... https://www.americanexpress.com/etc.clientlibs/enterprise/clientlibs/enterprise.min.js — 200 — 135.4 KiB — 54 ms — h2https://www.americanexpress.com/etc.clientlibs/homepage/clientlibs/homepage.min.jswww.americanexpress.com/etc.clientl... https://www.americanexpress.com/etc.clientlibs/homepage/clientlibs/homepage.min.js — 200 — 3.4 KiB — 35 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAMAAACdt4HsAAAA9lBMVEU+W5k+W5k+W5k+W5k+W5k+W…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAMAAACdt4HsAAAA9lBMVEU+W5k+W5k+W5k+W5k+W5k+W… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAYAAACqaXHeAAAABGdBTUEAALGPC/xhBQAAACBjSFJNA…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAYAAACqaXHeAAAABGdBTUEAALGPC/xhBQAAACBjSFJNA… — 200 — 0 B — 0 ms — data
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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 486ms · 98KB · €5/mo
www.americanexpress.com
Other
Optional
Execution 177ms
Transfer 1 KB
Unused 21%
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 165ms
Transfer 0 KB
Monthly Cost €2/mo
www.americanexpress.com
Other
Optional
Execution 144ms
Transfer 97 KB
Monthly Cost €2/mo

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

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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