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https://amazontrust.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
89
GRADE
B
FIX
2
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
97
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.
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.

1.02 s

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

1.02 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.

1.02 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.

1.02 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
9 PASS 2 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 (625.0 KiB of 625.3 KiB)
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
JS Bundles
34 scripts, 114 KB unused
REVIEW
34 scripts, 114 KB unused
Warning::
https://www.amazontrust.com/assets/root-ejUo2Bfm.j...: 42 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.amazontrust.com/assets/index-DT_-TPwo....: 26 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.amazontrust.com/assets/cloudwatchRum-B...: 23 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.amazontrust.com/assets/entry.client-JA...: 22 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 114 KB
114 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.amazontrust.com/assets/root-ejUo2Bfm.js59 KB42 KB (72%)✓3rd
https://www.amazontrust.com/assets/index-DT_-TPwo.js42 KB26 KB (64%)✓3rd
https://www.amazontrust.com/assets/cloudwatchRum-BavfjJze.js46 KB23 KB (52%)✓3rd
https://www.amazontrust.com/assets/entry.client-JAa7dmjd.js57 KB22 KB (40%)✓3rd
https://www.amazontrust.com/assets/handle-key-PSknjZbb.js4 KB—✓3rd
https://www.amazontrust.com/assets/internal-DUJKdEBb.js1 KB—✓3rd
https://www.amazontrust.com/assets/useTranslation-D73jT0OV.js2 KB—✓3rd
https://www.amazontrust.com/assets/constants-OVDVSXrx.js2 KB—✓3rd
https://www.amazontrust.com/assets/analytics-funnel-BLGvchBv.js43 KB—✓3rd
https://www.amazontrust.com/assets/use-sticky-header-Du51T5yF.js9 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
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
625 KB transferred, 63 requests
PASS
625 KB transferred, 63 requests
Info::
Page weighs 1.7 MB (625 KB transferred)
Info::
63 HTTP requests
Info::
Estimated 0.13 g CO2 per page load
625 KB / 2.4 MB budget
625 KB transferred
63 requests
0.13 g CO2 per page load
JavaScript 319.0 KiB 51%
CSS 191.7 KiB 31%
Images 51.4 KiB 8%
Fonts 48.6 KiB 8%
Other 6.5 KiB 1%
HTML 4.8 KiB 1%
Other 2.2 KiB 0%
Other 1.1 KiB 0%
Other 0 B 0%
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
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Warning::
https://www.amazontrust.com/assets/AWSLogo-DAEfQrX... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
2 images 51 KB
0 oversized -0 KB
1 legacy format
1 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

A+
JS Execution Cost
462ms total JS execution
PASS
462ms total JS execution
Warning::
Unattributable: 284ms CPU time
Info::
https://www.amazontrust.com/assets/entry.client-JA...: 110ms CPU time
Info::
https://www.amazontrust.com/: 68ms CPU time
Warning::
Third-party scripts: 462ms (100% of total)

Main Thread Breakdown

Other 58% Script Evaluation 29% Style & Layout 9%
ScriptTotalScriptingParse/CompileParty
Unattributable284ms24ms0ms3rd
https://www.amazontrust.com/assets/entry.client-JAa7dmjd.js110ms104ms0ms3rd
https://www.amazontrust.com/68ms6ms1ms3rd
A+
Font Loading
3 fonts (49 KB)
PASS
3 fonts (49 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

49 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 1.0 s LCP 1.0 sdata:font/woff2;base64,d09GMgABAAAAAEAYABIAAAAAe6gAAD+wAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGmIbIByEUAZg…woff2;base64,d09GMgABAA... data:font/woff2;base64,d09GMgABAAAAAEAYABIAAAAAe6gAAD+wAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGmIbIByEUAZg… — 16.0 KiB — 39 ms — font-display: swapdata:font/woff2;base64,d09GMgABAAAAAEE8ABIAAAAAe8QAAEDVAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGmIbIByEUAZg…woff2;base64,d09GMgABAA... data:font/woff2;base64,d09GMgABAAAAAEE8ABIAAAAAe8QAAEDVAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGmIbIByEUAZg… — 16.3 KiB — 38 ms — font-display: swapdata:font/woff2;base64,d09GMgABAAAAAEE0ABIAAAAAe5AAAEDMAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGmIbIByEUAZg…woff2;base64,d09GMgABAA... data:font/woff2;base64,d09GMgABAAAAAEE0ABIAAAAAe5AAAEDMAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGmIbIByEUAZg… — 16.3 KiB — 39 ms — font-display: swap
woff2;base64,d09GMgABAA... woff2 swap
Size 16 KB
Load time 39 ms
Start 498 ms
Risk FOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA... woff2 swap
Size 16 KB
Load time 38 ms
Start 500 ms
Risk FOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA... woff2 swap
Size 16 KB
Load time 39 ms
Start 500 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
A
Page Weight Inventory
63 resources · 625 KB · 114 KB savings available
PASS
63 resources · 625 KB · 114 KB savings available
Info::
Within 1MB page-weight target
Got: 625 KB
Info::
~114 KB of savings available
Warning::
62 third-party resources (100% of weight)
63 resources · 625.3 KiB · 62 third-party Within 1MB page-weight target
JavaScript 51% · 319.0 KiB
CSS 31% · 191.7 KiB
Image 8% · 52.8 KiB
Font 8% · 48.6 KiB
Other 1% · 8.4 KiB
Document 1% · 4.8 KiB

~114.2 KiB of savings available

Remove unused JavaScript: 114.2 KiB
Network Waterfall
63 requests over 2274ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.0 s LCP 1.0 shttps://amazontrust.com// https://amazontrust.com/ — 301 — 389 B — 120 ms — http/1.1https://www.amazontrust.com/index.htmlwww.amazontrust.com/index.html https://www.amazontrust.com/index.html — 308 — 385 B — 160 ms — h2https://www.amazontrust.com/www.amazontrust.com/ https://www.amazontrust.com/ — 200 — 4.8 KiB — 23 ms — h2https://www.amazontrust.com/assets/AWSLogo-DAEfQrXf.svgwww.amazontrust.com/assets/AWSLogo-... https://www.amazontrust.com/assets/AWSLogo-DAEfQrXf.svg — 200 — 3.1 KiB — 22 ms — h2https://www.amazontrust.com/assets/AWS_GradientLibrary_RGB_ColorPalette01_CP01_Dark_B-8-Dsfr_L0K.webpwww.amazontrust.com/assets/AWS_Grad... https://www.amazontrust.com/assets/AWS_GradientLibrary_RGB_ColorPalette01_CP01_Dark_B-8-Dsfr_L0K.webp — 200 — 48.3 KiB — 59 ms — h2https://www.amazontrust.com/assets/manifest-ee598e5a.jswww.amazontrust.com/assets/manifest... https://www.amazontrust.com/assets/manifest-ee598e5a.js — 200 — 2.5 KiB — 51 ms — h2https://www.amazontrust.com/assets/entry.client-JAa7dmjd.jswww.amazontrust.com/assets/entry.cl... https://www.amazontrust.com/assets/entry.client-JAa7dmjd.js — 200 — 56.8 KiB — 56 ms — h2https://www.amazontrust.com/assets/index-DT_-TPwo.jswww.amazontrust.com/assets/index-DT... https://www.amazontrust.com/assets/index-DT_-TPwo.js — 200 — 42.0 KiB — 62 ms — h2https://www.amazontrust.com/assets/context-Cy7pwnZ3.jswww.amazontrust.com/assets/context-... https://www.amazontrust.com/assets/context-Cy7pwnZ3.js — 200 — 15.1 KiB — 137 ms — h2https://www.amazontrust.com/assets/constants-OVDVSXrx.jswww.amazontrust.com/assets/constant... https://www.amazontrust.com/assets/constants-OVDVSXrx.js — 200 — 1.5 KiB — 160 ms — h2https://www.amazontrust.com/assets/i18n-CrDlnjSy.jswww.amazontrust.com/assets/i18n-CrD... https://www.amazontrust.com/assets/i18n-CrDlnjSy.js — 200 — 1.1 KiB — 172 ms — h2https://www.amazontrust.com/assets/useTranslation-D73jT0OV.jswww.amazontrust.com/assets/useTrans... https://www.amazontrust.com/assets/useTranslation-D73jT0OV.js — 200 — 2.2 KiB — 178 ms — h2https://www.amazontrust.com/assets/root-ejUo2Bfm.jswww.amazontrust.com/assets/root-ejU... https://www.amazontrust.com/assets/root-ejUo2Bfm.js — 200 — 58.8 KiB — 154 ms — h2https://www.amazontrust.com/assets/analytics-funnel-BLGvchBv.jswww.amazontrust.com/assets/analytic... https://www.amazontrust.com/assets/analytics-funnel-BLGvchBv.js — 200 — 43.1 KiB — 162 ms — h2https://www.amazontrust.com/assets/use-sticky-header-Du51T5yF.jswww.amazontrust.com/assets/use-stic... https://www.amazontrust.com/assets/use-sticky-header-Du51T5yF.js — 200 — 8.8 KiB — 156 ms — h2https://www.amazontrust.com/assets/index-BZmJZVQR.jswww.amazontrust.com/assets/index-BZ... https://www.amazontrust.com/assets/index-BZmJZVQR.js — 200 — 1.2 KiB — 87 ms — h2https://www.amazontrust.com/assets/internal-Bs796dyn.jswww.amazontrust.com/assets/internal... https://www.amazontrust.com/assets/internal-Bs796dyn.js — 200 — 4.2 KiB — 141 ms — h2https://www.amazontrust.com/assets/browser-scrollbar-size-CEGTQAOI.jswww.amazontrust.com/assets/browser-... https://www.amazontrust.com/assets/browser-scrollbar-size-CEGTQAOI.js — 200 — 1.5 KiB — 116 ms — h2https://www.amazontrust.com/assets/external-props-BxzNJ8Rq.jswww.amazontrust.com/assets/external... https://www.amazontrust.com/assets/external-props-BxzNJ8Rq.js — 200 — 768 B — 112 ms — h2https://www.amazontrust.com/assets/reset-contexts-for-modal-NKaj7Aim.jswww.amazontrust.com/assets/reset-co... https://www.amazontrust.com/assets/reset-contexts-for-modal-NKaj7Aim.js — 200 — 1.2 KiB — 117 ms — h2https://www.amazontrust.com/assets/join-strings-CFMkUcCP.jswww.amazontrust.com/assets/join-str... https://www.amazontrust.com/assets/join-strings-CFMkUcCP.js — 200 — 1.6 KiB — 166 ms — h2https://www.amazontrust.com/assets/handle-key-PSknjZbb.jswww.amazontrust.com/assets/handle-k... https://www.amazontrust.com/assets/handle-key-PSknjZbb.js — 200 — 3.6 KiB — 134 ms — h2https://www.amazontrust.com/assets/internal-D-qvuTFC.jswww.amazontrust.com/assets/internal... https://www.amazontrust.com/assets/internal-D-qvuTFC.js — 200 — 2.4 KiB — 112 ms — h2https://www.amazontrust.com/assets/index-Cvm3K312.jswww.amazontrust.com/assets/index-Cv... https://www.amazontrust.com/assets/index-Cvm3K312.js — 200 — 1.0 KiB — 146 ms — h2https://www.amazontrust.com/assets/internal-DUJKdEBb.jswww.amazontrust.com/assets/internal... https://www.amazontrust.com/assets/internal-DUJKdEBb.js — 200 — 1.2 KiB — 121 ms — h2https://www.amazontrust.com/assets/form-field-context-yA4WiPNl.jswww.amazontrust.com/assets/form-fie... https://www.amazontrust.com/assets/form-field-context-yA4WiPNl.js — 200 — 937 B — 130 ms — h2https://www.amazontrust.com/assets/cloudwatchRum-BavfjJze.jswww.amazontrust.com/assets/cloudwat... https://www.amazontrust.com/assets/cloudwatchRum-BavfjJze.js — 200 — 45.9 KiB — 173 ms — h2https://www.amazontrust.com/assets/internal-sPP467c7.jswww.amazontrust.com/assets/internal... https://www.amazontrust.com/assets/internal-sPP467c7.js — 200 — 4.1 KiB — 141 ms — h2https://www.amazontrust.com/assets/AWS_GradientLibrary_RGB_ColorPalette01_CP01_Dark_B-8-h3cf8mPV.jswww.amazontrust.com/assets/AWS_Grad... https://www.amazontrust.com/assets/AWS_GradientLibrary_RGB_ColorPalette01_CP01_Dark_B-8-h3cf8mPV.js — 200 — 765 B — 137 ms — h2https://www.amazontrust.com/assets/Trans-Qk-2FUZK.jswww.amazontrust.com/assets/Trans-Qk... https://www.amazontrust.com/assets/Trans-Qk-2FUZK.js — 200 — 4.5 KiB — 117 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.0 s LCP 1.0 shttps://amazontrust.com// https://amazontrust.com/ — 301 — 389 B — 120 ms — http/1.1https://www.amazontrust.com/index.htmlwww.amazontrust.com/index.html https://www.amazontrust.com/index.html — 308 — 385 B — 160 ms — h2https://www.amazontrust.com/www.amazontrust.com/ https://www.amazontrust.com/ — 200 — 4.8 KiB — 23 ms — h2https://www.amazontrust.com/assets/AWSLogo-DAEfQrXf.svgwww.amazontrust.com/assets/AWSLogo-... https://www.amazontrust.com/assets/AWSLogo-DAEfQrXf.svg — 200 — 3.1 KiB — 22 ms — h2https://www.amazontrust.com/assets/AWS_GradientLibrary_RGB_ColorPalette01_CP01_Dark_B-8-Dsfr_L0K.webpwww.amazontrust.com/assets/AWS_Grad... https://www.amazontrust.com/assets/AWS_GradientLibrary_RGB_ColorPalette01_CP01_Dark_B-8-Dsfr_L0K.webp — 200 — 48.3 KiB — 59 ms — h2https://www.amazontrust.com/assets/manifest-ee598e5a.jswww.amazontrust.com/assets/manifest... https://www.amazontrust.com/assets/manifest-ee598e5a.js — 200 — 2.5 KiB — 51 ms — h2https://www.amazontrust.com/assets/entry.client-JAa7dmjd.jswww.amazontrust.com/assets/entry.cl... https://www.amazontrust.com/assets/entry.client-JAa7dmjd.js — 200 — 56.8 KiB — 56 ms — h2https://www.amazontrust.com/assets/index-DT_-TPwo.jswww.amazontrust.com/assets/index-DT... https://www.amazontrust.com/assets/index-DT_-TPwo.js — 200 — 42.0 KiB — 62 ms — h2https://www.amazontrust.com/assets/context-Cy7pwnZ3.jswww.amazontrust.com/assets/context-... https://www.amazontrust.com/assets/context-Cy7pwnZ3.js — 200 — 15.1 KiB — 137 ms — h2https://www.amazontrust.com/assets/constants-OVDVSXrx.jswww.amazontrust.com/assets/constant... https://www.amazontrust.com/assets/constants-OVDVSXrx.js — 200 — 1.5 KiB — 160 ms — h2https://www.amazontrust.com/assets/i18n-CrDlnjSy.jswww.amazontrust.com/assets/i18n-CrD... https://www.amazontrust.com/assets/i18n-CrDlnjSy.js — 200 — 1.1 KiB — 172 ms — h2https://www.amazontrust.com/assets/useTranslation-D73jT0OV.jswww.amazontrust.com/assets/useTrans... https://www.amazontrust.com/assets/useTranslation-D73jT0OV.js — 200 — 2.2 KiB — 178 ms — h2https://www.amazontrust.com/assets/root-ejUo2Bfm.jswww.amazontrust.com/assets/root-ejU... https://www.amazontrust.com/assets/root-ejUo2Bfm.js — 200 — 58.8 KiB — 154 ms — h2https://www.amazontrust.com/assets/analytics-funnel-BLGvchBv.jswww.amazontrust.com/assets/analytic... https://www.amazontrust.com/assets/analytics-funnel-BLGvchBv.js — 200 — 43.1 KiB — 162 ms — h2https://www.amazontrust.com/assets/use-sticky-header-Du51T5yF.jswww.amazontrust.com/assets/use-stic... https://www.amazontrust.com/assets/use-sticky-header-Du51T5yF.js — 200 — 8.8 KiB — 156 ms — h2https://www.amazontrust.com/assets/index-BZmJZVQR.jswww.amazontrust.com/assets/index-BZ... https://www.amazontrust.com/assets/index-BZmJZVQR.js — 200 — 1.2 KiB — 87 ms — h2https://www.amazontrust.com/assets/internal-Bs796dyn.jswww.amazontrust.com/assets/internal... https://www.amazontrust.com/assets/internal-Bs796dyn.js — 200 — 4.2 KiB — 141 ms — h2https://www.amazontrust.com/assets/browser-scrollbar-size-CEGTQAOI.jswww.amazontrust.com/assets/browser-... https://www.amazontrust.com/assets/browser-scrollbar-size-CEGTQAOI.js — 200 — 1.5 KiB — 116 ms — h2https://www.amazontrust.com/assets/external-props-BxzNJ8Rq.jswww.amazontrust.com/assets/external... https://www.amazontrust.com/assets/external-props-BxzNJ8Rq.js — 200 — 768 B — 112 ms — h2https://www.amazontrust.com/assets/reset-contexts-for-modal-NKaj7Aim.jswww.amazontrust.com/assets/reset-co... https://www.amazontrust.com/assets/reset-contexts-for-modal-NKaj7Aim.js — 200 — 1.2 KiB — 117 ms — h2https://www.amazontrust.com/assets/join-strings-CFMkUcCP.jswww.amazontrust.com/assets/join-str... https://www.amazontrust.com/assets/join-strings-CFMkUcCP.js — 200 — 1.6 KiB — 166 ms — h2https://www.amazontrust.com/assets/handle-key-PSknjZbb.jswww.amazontrust.com/assets/handle-k... https://www.amazontrust.com/assets/handle-key-PSknjZbb.js — 200 — 3.6 KiB — 134 ms — h2https://www.amazontrust.com/assets/internal-D-qvuTFC.jswww.amazontrust.com/assets/internal... https://www.amazontrust.com/assets/internal-D-qvuTFC.js — 200 — 2.4 KiB — 112 ms — h2https://www.amazontrust.com/assets/index-Cvm3K312.jswww.amazontrust.com/assets/index-Cv... https://www.amazontrust.com/assets/index-Cvm3K312.js — 200 — 1.0 KiB — 146 ms — h2https://www.amazontrust.com/assets/internal-DUJKdEBb.jswww.amazontrust.com/assets/internal... https://www.amazontrust.com/assets/internal-DUJKdEBb.js — 200 — 1.2 KiB — 121 ms — h2https://www.amazontrust.com/assets/form-field-context-yA4WiPNl.jswww.amazontrust.com/assets/form-fie... https://www.amazontrust.com/assets/form-field-context-yA4WiPNl.js — 200 — 937 B — 130 ms — h2https://www.amazontrust.com/assets/cloudwatchRum-BavfjJze.jswww.amazontrust.com/assets/cloudwat... https://www.amazontrust.com/assets/cloudwatchRum-BavfjJze.js — 200 — 45.9 KiB — 173 ms — h2https://www.amazontrust.com/assets/internal-sPP467c7.jswww.amazontrust.com/assets/internal... https://www.amazontrust.com/assets/internal-sPP467c7.js — 200 — 4.1 KiB — 141 ms — h2https://www.amazontrust.com/assets/AWS_GradientLibrary_RGB_ColorPalette01_CP01_Dark_B-8-h3cf8mPV.jswww.amazontrust.com/assets/AWS_Grad... https://www.amazontrust.com/assets/AWS_GradientLibrary_RGB_ColorPalette01_CP01_Dark_B-8-h3cf8mPV.js — 200 — 765 B — 137 ms — h2https://www.amazontrust.com/assets/Trans-Qk-2FUZK.jswww.amazontrust.com/assets/Trans-Qk... https://www.amazontrust.com/assets/Trans-Qk-2FUZK.js — 200 — 4.5 KiB — 117 ms — h2https://www.amazontrust.com/assets/index-yw2GGc05.jswww.amazontrust.com/assets/index-yw... https://www.amazontrust.com/assets/index-yw2GGc05.js — 200 — 1.5 KiB — 166 ms — h2https://www.amazontrust.com/assets/index-L4Qi0vmi.jswww.amazontrust.com/assets/index-L4... https://www.amazontrust.com/assets/index-L4Qi0vmi.js — 200 — 1.1 KiB — 289 ms — h2https://www.amazontrust.com/assets/index-CA25M0Gh.jswww.amazontrust.com/assets/index-CA... https://www.amazontrust.com/assets/index-CA25M0Gh.js — 200 — 1.2 KiB — 95 ms — h2https://www.amazontrust.com/assets/internal-BWqJmIcs.jswww.amazontrust.com/assets/internal... https://www.amazontrust.com/assets/internal-BWqJmIcs.js — 200 — 1.9 KiB — 273 ms — h2https://www.amazontrust.com/assets/index-Q4V9-Ofn.jswww.amazontrust.com/assets/index-Q4... https://www.amazontrust.com/assets/index-Q4V9-Ofn.js — 200 — 1.5 KiB — 166 ms — h2https://www.amazontrust.com/assets/index-B_o7aoQs.jswww.amazontrust.com/assets/index-B_... https://www.amazontrust.com/assets/index-B_o7aoQs.js — 200 — 1.0 KiB — 113 ms — h2https://www.amazontrust.com/assets/index-BcXdwuGk.jswww.amazontrust.com/assets/index-Bc... https://www.amazontrust.com/assets/index-BcXdwuGk.js — 200 — 1.5 KiB — 140 ms — h2https://www.amazontrust.com/assets/index-c1VO1JBq.jswww.amazontrust.com/assets/index-c1... 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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 462ms · 62KB · €5/mo
Unattributable
Other
Costly
Execution 284ms
Transfer 0 KB
Monthly Cost €3/mo
www.amazontrust.com
Other
Optional
Execution 110ms
Transfer 57 KB
Unused 40%
Monthly Cost €1/mo
www.amazontrust.com
Other
Optional
Execution 68ms
Transfer 5 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 284ms and costs ~€3/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

Unattributable takes 284ms 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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