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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
2
REVIEW
4
PASS
9
INFO
2

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

Mobile Desktop
75
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.
92
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.

1.98 s

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

6.37 s

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

56 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.

3.30 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.

6.44 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
9 PASS 4 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 (903.7 KiB of 903.8 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.

C
Image Optimization
Action
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
https://assets.prod.abebookscdn.com/cdn/shared/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.prod.abebookscdn.com/cdn/shared/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.prod.abebookscdn.com/cdn/shared/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 353 KB
0 oversized -0 KB
15 legacy format
3 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

C
JS Execution Cost
Action
1499ms total JS execution
REVIEW
1499ms total JS execution
Warning::
https://assets.prod.abebookscdn.com/cdn/com/script...: 375ms CPU time
Warning::
https://www.abebooks.com/: 322ms CPU time
Warning::
Unattributable: 320ms CPU time
Info::
https://assets.prod.abebookscdn.com/cdn/com/script...: 176ms CPU time
Info::
https://assets.brightspot.abebooks.a2z.com/resourc...: 90ms CPU time
Warning::
Third-party scripts: 1499ms (100% of total)

Main Thread Breakdown

Script Evaluation 35% Other 31% Style & Layout 21% Parse HTML & CSS 4% Script Parsing & Compilation 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://assets.prod.abebookscdn.com/cdn/com/scripts/combined/csa-d403f7adf4.js375ms97ms3ms3rd
https://www.abebooks.com/322ms31ms6ms3rd
Unattributable320ms14ms0ms3rd
https://assets.prod.abebookscdn.com/cdn/com/scripts/vendor/react18.bundle-8d00f21452.js176ms140ms10ms3rd
https://assets.brightspot.abebooks.a2z.com/resource/00000179-3cdd-d40f-a779-bedf7f820000/styleguide/All.min.7e6ab57976631cf2500d4b94dc6618e4.gz.js90ms52ms22ms3rd
https://assets.prod.abebookscdn.com/cdn/com/scripts/combined/global-base.v2-629127c516.js77ms70ms1ms3rd
https://assets.prod.abebookscdn.com/cdn/com/scripts/cwrumclient-d9349b9d05.js77ms62ms12ms3rd
https://assets.brightspot.abebooks.a2z.com/resource/webpack/541.097e69cbfdf1178933d1.js61ms27ms0ms3rd
B
JS Bundles
19 scripts, 77 KB unused
REVIEW
19 scripts, 77 KB unused
Warning::
https://assets.brightspot.abebooks.a2z.com/resourc...: 54 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.prod.abebookscdn.com/cdn/com/script...: 23 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 77 KB
77 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets.brightspot.abebooks.a2z.com/resource/00000179-3cdd-d40f-a779-bedf7f820000/styleguide/All.min.7e6ab57976631cf2500d4b94dc6618e4.gz.js68 KB54 KB (79%)✓3rd
https://assets.prod.abebookscdn.com/cdn/com/scripts/cwrumclient-d9349b9d05.js39 KB23 KB (59%)✓3rd
https://assets.prod.abebookscdn.com/cdn/com/scripts/combined/csa-d403f7adf4.js13 KB—✓3rd
https://assets.prod.abebookscdn.com/cdn/com/scripts/components/productwidget_recommendations_home-78267ef0b8.js1 KB—✓3rd
https://assets.prod.abebookscdn.com/cdn/com/scripts/vendor/react18.bundle-8d00f21452.js46 KB—✓3rd
https://assets.prod.abebookscdn.com/cdn/com/scripts/combined/global-base.v2-629127c516.js2 KB—✓3rd
https://assets.prod.abebookscdn.com/cdn/com/scripts/sitenavtoggle-e7be457d87.js1 KB—✓3rd
https://assets.prod.abebookscdn.com/cdn/com/scripts/components/eventbus-e0d54b1290.js1 KB—✓3rd
https://assets.prod.abebookscdn.com/cdn/com/scripts/bootstrap.native-b164d16592.js2 KB—✓3rd
https://assets.prod.abebookscdn.com/cdn/com/scripts/components/productwidget_core-bbffc9c3e8.js15 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
904 KB transferred, 57 requests
PASS
904 KB transferred, 57 requests
Info::
Page weighs 2.2 MB (904 KB transferred)
Info::
57 HTTP requests
Info::
Estimated 0.19 g CO2 per page load
904 KB / 2.4 MB budget
904 KB transferred
57 requests
0.19 g CO2 per page load
Images 353.0 KiB 39%
JavaScript 220.1 KiB 24%
Fonts 198.7 KiB 22%
CSS 82.2 KiB 9%
HTML 41.1 KiB 5%
Other 4.8 KiB 1%
Other 1.8 KiB 0%
Other 1.5 KiB 0%
Other 596 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+
Font Loading
5 fonts (199 KB)
PASS
5 fonts (199 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

199 KB total

Render-blocking

0

of 5

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 4.0 s 5.0 s 6.0 s FCP 2.0 s LCP 6.4 shttps://assets.prod.abebookscdn.com/cdn/shared/fonts/ember/AmazonEmber_W_Bd.woff2AmazonEmber_W_Bd.woff2 https://assets.prod.abebookscdn.com/cdn/shared/fonts/ember/AmazonEmber_W_Bd.woff2 — 64.4 KiB — 48 ms — font-display: swaphttps://assets.prod.abebookscdn.com/cdn/shared/fonts/ember/AmazonEmber_W_Rg.woff2AmazonEmber_W_Rg.woff2 https://assets.prod.abebookscdn.com/cdn/shared/fonts/ember/AmazonEmber_W_Rg.woff2 — 64.4 KiB — 54 ms — font-display: swaphttps://assets.brightspot.abebooks.a2z.com/resource/00000179-3cdd-d40f-a779-bedf7f820000/106ba4225232873f12c0.4664da3866680953e1d59d76b27885c4.woff2106ba4225232873f12c0.46... https://assets.brightspot.abebooks.a2z.com/resource/00000179-3cdd-d40f-a779-bedf7f820000/106ba4225232873f12c0.4664da3866680953e1d59d76b27885c4.woff2 — 21.2 KiB — 6 ms — font-display: swaphttps://assets.brightspot.abebooks.a2z.com/resource/00000179-3cdd-d40f-a779-bedf7f820000/468fcbeda4f4dddfff2e.3af5b8c30a74380709837f8a9d09f0cd.woff2468fcbeda4f4dddfff2e.3a... https://assets.brightspot.abebooks.a2z.com/resource/00000179-3cdd-d40f-a779-bedf7f820000/468fcbeda4f4dddfff2e.3af5b8c30a74380709837f8a9d09f0cd.woff2 — 21.2 KiB — 9 ms — font-display: swaphttps://assets.brightspot.abebooks.a2z.com/resource/00000179-3cdd-d40f-a779-bedf7f820000/d26713d7962516a8e8bc.1e10a9c699a3c6370777fdcd729573dd.woff2d26713d7962516a8e8bc.1e... https://assets.brightspot.abebooks.a2z.com/resource/00000179-3cdd-d40f-a779-bedf7f820000/d26713d7962516a8e8bc.1e10a9c699a3c6370777fdcd729573dd.woff2 — 27.6 KiB — 9 ms — font-display: swap
AmazonEmber_W_Bd.woff2 woff2 swap
Size 64 KB
Load time 48 ms
Start 618 ms
Risk FOUT — text flashes from fallback to web font
AmazonEmber_W_Rg.woff2 woff2 swap
Size 64 KB
Load time 54 ms
Start 618 ms
Risk FOUT — text flashes from fallback to web font
106ba4225232873f12c0.46... woff2 swap
Size 21 KB
Load time 6 ms
Start 798 ms
Risk FOUT — text flashes from fallback to web font
468fcbeda4f4dddfff2e.3a... woff2 swap
Size 21 KB
Load time 9 ms
Start 801 ms
Risk FOUT — text flashes from fallback to web font
d26713d7962516a8e8bc.1e... woff2 swap
Size 28 KB
Load time 9 ms
Start 801 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
1
preload
1
dns-prefetch
—
prefetch
—

2 resource hints configured

A
Page Weight Inventory
57 resources · 904 KB · 77 KB savings available
PASS
57 resources · 904 KB · 77 KB savings available
Info::
Within 1MB page-weight target
Got: 904 KB
Info::
~77 KB of savings available
Warning::
56 third-party resources (100% of weight)
57 resources · 903.8 KiB · 56 third-party Within 1MB page-weight target
Image 39% · 354.4 KiB
JavaScript 24% · 220.1 KiB
Font 22% · 198.7 KiB
CSS 9% · 82.2 KiB
Document 5% · 41.1 KiB
Other 1% · 7.2 KiB

~76.6 KiB of savings available

Remove unused JavaScript: 76.6 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
57 requests over 1369ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.0 s LCP 6.4 shttps://abebooks.com// https://abebooks.com/ — 301 — 94 B — 331 ms — h2https://www.abebooks.com/www.abebooks.com/ https://www.abebooks.com/ — 200 — 41.1 KiB — 246 ms — h2https://assets.brightspot.abebooks.a2z.com/dims4/default/3f23eb8/2147483647/strip/true/crop/1580x760+0+0/resize/936x450!/format/webp/quality/90/?url=http%3A%2F%2Fabebooks-brightspot.s3.us-west-2.amazonaws.com%2Ffa%2Fc9%2F72d3429f4ae39240cc444e556eaa%2Fcarousel-jane-austen.pngassets.brightspot.abebooks.a2z.com/... https://assets.brightspot.abebooks.a2z.com/dims4/default/3f23eb8/2147483647/strip/true/crop/1580x760+0+0/resize/936x450!/format/webp/quality/90/?url=http%3A%2F%2Fabebooks-brightspot.s3.us-west-2.amazonaws.com%2Ffa%2Fc9%2F72d3429f4ae39240cc444e556eaa%2Fcarousel-jane-austen.png — 200 — 58.0 KiB — 134 ms — h2https://assets.prod.abebookscdn.com/cdn/com/scripts/vendor/react18.bundle-8d00f21452.jsassets.prod.abebookscdn.com/cdn/com... https://assets.prod.abebookscdn.com/cdn/com/scripts/vendor/react18.bundle-8d00f21452.js — 200 — 46.1 KiB — 82 ms — h2https://assets.prod.abebookscdn.com/cdn/shared/images/common/logos/abebooks-logo-com.pngassets.prod.abebookscdn.com/cdn/sha... https://assets.prod.abebookscdn.com/cdn/shared/images/common/logos/abebooks-logo-com.png — 200 — 4.7 KiB — 68 ms — h2https://assets.brightspot.abebooks.a2z.com/resource/00000179-3cdd-d40f-a779-bedf7f820000/styleguide/All.min.800b47662f6255c0dabb07106f1d3e3b.gz.cssassets.brightspot.abebooks.a2z.com/... https://assets.brightspot.abebooks.a2z.com/resource/00000179-3cdd-d40f-a779-bedf7f820000/styleguide/All.min.800b47662f6255c0dabb07106f1d3e3b.gz.css — 200 — 76.6 KiB — 133 ms — h2https://assets.prod.abebookscdn.com/cdn/shared/images/common/social/facebook.svgassets.prod.abebookscdn.com/cdn/sha... https://assets.prod.abebookscdn.com/cdn/shared/images/common/social/facebook.svg — 200 — 987 B — 64 ms — h2https://assets.prod.abebookscdn.com/cdn/shared/images/common/social/x-twitter.svgassets.prod.abebookscdn.com/cdn/sha... https://assets.prod.abebookscdn.com/cdn/shared/images/common/social/x-twitter.svg — 200 — 878 B — 65 ms — h2https://assets.prod.abebookscdn.com/cdn/shared/images/common/social/instagram.svgassets.prod.abebookscdn.com/cdn/sha... https://assets.prod.abebookscdn.com/cdn/shared/images/common/social/instagram.svg — 200 — 1.0 KiB — 66 ms — h2https://assets.prod.abebookscdn.com/cdn/shared/images/common/footer/abebooks-footer-logo.pngassets.prod.abebookscdn.com/cdn/sha... https://assets.prod.abebookscdn.com/cdn/shared/images/common/footer/abebooks-footer-logo.png — 200 — 7.8 KiB — 67 ms — h2https://assets.brightspot.abebooks.a2z.com/resource/00000179-3cdd-d40f-a779-bedf7f820000/webcomponents-loader/webcomponents-loader.2938a610ca02c611209b1a5ba2884385.gz.jsassets.brightspot.abebooks.a2z.com/... https://assets.brightspot.abebooks.a2z.com/resource/00000179-3cdd-d40f-a779-bedf7f820000/webcomponents-loader/webcomponents-loader.2938a610ca02c611209b1a5ba2884385.gz.js — 200 — 1.4 KiB — 117 ms — h2https://assets.brightspot.abebooks.a2z.com/resource/00000179-3cdd-d40f-a779-bedf7f820000/styleguide/All.min.7e6ab57976631cf2500d4b94dc6618e4.gz.jsassets.brightspot.abebooks.a2z.com/... https://assets.brightspot.abebooks.a2z.com/resource/00000179-3cdd-d40f-a779-bedf7f820000/styleguide/All.min.7e6ab57976631cf2500d4b94dc6618e4.gz.js — 200 — 68.5 KiB — 124 ms — h2https://www.abebooks.com/cdn/shared/images/header/search.pngwww.abebooks.com/cdn/shared/images/... https://www.abebooks.com/cdn/shared/images/header/search.png — 200 — 970 B — 136 ms — h2https://assets.prod.abebookscdn.com/cdn/shared/fonts/ember/AmazonEmber_W_Bd.woff2assets.prod.abebookscdn.com/cdn/sha... https://assets.prod.abebookscdn.com/cdn/shared/fonts/ember/AmazonEmber_W_Bd.woff2 — 200 — 64.4 KiB — 48 ms — h2https://assets.prod.abebookscdn.com/cdn/shared/fonts/ember/AmazonEmber_W_Rg.woff2assets.prod.abebookscdn.com/cdn/sha... https://assets.prod.abebookscdn.com/cdn/shared/fonts/ember/AmazonEmber_W_Rg.woff2 — 200 — 64.4 KiB — 54 ms — h2https://assets.prod.abebookscdn.com/cdn/com/scripts/combined/global-utils-123e61a80f.jsassets.prod.abebookscdn.com/cdn/com... https://assets.prod.abebookscdn.com/cdn/com/scripts/combined/global-utils-123e61a80f.js — 200 — 8.6 KiB — 12 ms — h2https://assets.prod.abebookscdn.com/cdn/com/scripts/combined/csa-d403f7adf4.jsassets.prod.abebookscdn.com/cdn/com... https://assets.prod.abebookscdn.com/cdn/com/scripts/combined/csa-d403f7adf4.js — 200 — 12.8 KiB — 35 ms — h2https://assets.prod.abebookscdn.com/cdn/com/scripts/combined/global-base.v2-629127c516.jsassets.prod.abebookscdn.com/cdn/com... https://assets.prod.abebookscdn.com/cdn/com/scripts/combined/global-base.v2-629127c516.js — 200 — 1.9 KiB — 13 ms — h2https://assets.prod.abebookscdn.com/cdn/com/scripts/sitenavtoggle-e7be457d87.jsassets.prod.abebookscdn.com/cdn/com... https://assets.prod.abebookscdn.com/cdn/com/scripts/sitenavtoggle-e7be457d87.js — 200 — 821 B — 14 ms — h2https://assets.prod.abebookscdn.com/cdn/com/scripts/components/eventbus-e0d54b1290.jsassets.prod.abebookscdn.com/cdn/com... https://assets.prod.abebookscdn.com/cdn/com/scripts/components/eventbus-e0d54b1290.js — 200 — 1.3 KiB — 16 ms — h2https://assets.prod.abebookscdn.com/cdn/com/scripts/bootstrap.native-b164d16592.jsassets.prod.abebookscdn.com/cdn/com... https://assets.prod.abebookscdn.com/cdn/com/scripts/bootstrap.native-b164d16592.js — 200 — 2.2 KiB — 18 ms — h2https://assets.prod.abebookscdn.com/cdn/com/scripts/components/productwidget_core-bbffc9c3e8.jsassets.prod.abebookscdn.com/cdn/com... https://assets.prod.abebookscdn.com/cdn/com/scripts/components/productwidget_core-bbffc9c3e8.js — 200 — 15.3 KiB — 35 ms — h2https://assets.prod.abebookscdn.com/cdn/com/scripts/components/productwidget_merch-8ae3fc5eaa.jsassets.prod.abebookscdn.com/cdn/com... https://assets.prod.abebookscdn.com/cdn/com/scripts/components/productwidget_merch-8ae3fc5eaa.js — 200 — 2.2 KiB — 31 ms — h2https://assets.prod.abebookscdn.com/cdn/com/scripts/components/productwidget_recommendations_home-78267ef0b8.jsassets.prod.abebookscdn.com/cdn/com... https://assets.prod.abebookscdn.com/cdn/com/scripts/components/productwidget_recommendations_home-78267ef0b8.js — 200 — 1.5 KiB — 32 ms — h2https://assets.prod.abebookscdn.com/cdn/com/scripts/cwrumclient-d9349b9d05.jsassets.prod.abebookscdn.com/cdn/com... https://assets.prod.abebookscdn.com/cdn/com/scripts/cwrumclient-d9349b9d05.js — 200 — 38.8 KiB — 36 ms — h2https://assets.prod.abebookscdn.com/cdn/shared/images/common/loading/spinner.svgassets.prod.abebookscdn.com/cdn/sha... https://assets.prod.abebookscdn.com/cdn/shared/images/common/loading/spinner.svg — 200 — 996 B — 20 ms — 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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 1499ms · 211KB · €8/mo
assets.prod.abebookscdn.com
Other
Costly
Execution 375ms
Transfer 13 KB
Monthly Cost €2/mo
www.abebooks.com
Other
Costly
Execution 322ms
Transfer 41 KB
Monthly Cost €2/mo
Unattributable
Other
Costly
Execution 320ms
Transfer 0 KB
Monthly Cost €2/mo
assets.prod.abebookscdn.com
Other
Optional
Execution 176ms
Transfer 46 KB
Monthly Cost €1/mo
assets.brightspot.abebooks.a2z.com
Other
Optional
Execution 90ms
Transfer 68 KB
Unused 79%
Monthly Cost €0/mo
assets.prod.abebookscdn.com
Other
Optional
Execution 77ms
Transfer 2 KB
Monthly Cost €0/mo
assets.prod.abebookscdn.com
Other
Optional
Execution 77ms
Transfer 39 KB
Unused 59%
Monthly Cost €0/mo
assets.brightspot.abebooks.a2z.com
Other
Optional
Execution 61ms
Transfer 2 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • assets.prod.abebookscdn.com adds 375ms and costs ~€2/month
  • www.abebooks.com adds 322ms and costs ~€2/month
  • Unattributable adds 320ms and costs ~€2/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

assets.prod.abebookscdn.com takes 375ms 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.abebooks.com takes 322ms 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 320ms 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

79% of assets.brightspot.abebooks.a2z.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

59% of assets.prod.abebookscdn.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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