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https://worldcat.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
30
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.
69
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.

4.90 s

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

16.19 s

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

2.27 s

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.

7.74 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.

16.31 s

Page Load Progression

399 ms
798 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.2 s
Checks
17
8 PASS 1 REVIEW 6 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 125 requests
FIX
2.2 MB transferred, 125 requests
Info::
Page weighs 6.4 MB (2.2 MB transferred)
Warning::
JavaScript is 918 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 918 KB
Info::
Fonts are 409 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 409 KB
Warning::
125 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
125 requests
0.46 g CO2 per page load
JavaScript 918.3 KiB 41%
Other 425.8 KiB 19%
Fonts 408.6 KiB 18%
Images 294.9 KiB 13%
Other 96.8 KiB 4%
HTML 94.9 KiB 4%
Other 5.0 KiB 0%
CSS 2.4 KiB 0%
Other 1.1 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6911ms total JS execution
FIX
6911ms total JS execution
Warning::
https://search.worldcat.org/_next/static/chunks/fr...: 2185ms CPU time
Warning::
https://search.worldcat.org/: 916ms CPU time
Warning::
Unattributable: 623ms CPU time
Warning::
https://cdn.cookielaw.org/scripttemplates/202503.1...: 568ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T78...: 438ms CPU time
Warning::
Third-party scripts: 6911ms (100% of total)

Main Thread Breakdown

Script Evaluation 71% Other 12% Script Parsing & Compilation 8% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
https://search.worldcat.org/_next/static/chunks/framework-378c8f1031e2e5b2.js2185ms2051ms28ms3rd
https://search.worldcat.org/916ms346ms22ms3rd
Unattributable623ms85ms0ms3rd
https://cdn.cookielaw.org/scripttemplates/202503.1.0/otBannerSdk.js568ms362ms125ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T78H6Q6438ms366ms42ms3rd
https://search.worldcat.org/_next/static/chunks/pages/_app-179c87dcd1fa8d64.js434ms311ms122ms3rd
https://search.worldcat.org/_next/static/chunks/81-9089fe14406a16cb.js393ms348ms40ms3rd
https://search.worldcat.org/_next/static/chunks/2391.aede3f03048b823f.js332ms315ms6ms3rd
https://search.worldcat.org/_next/static/chunks/main-ac5ca2eebc7ba9d0.js255ms208ms12ms3rd
https://search.worldcat.org/cdn-cgi/challenge-platform/scripts/jsd/main.js252ms241ms2ms3rd

Showing top 10 of 15 scripts

F
JS Bundles
Action
64 scripts, 2.1 MB unused
FIX
64 scripts, 2.1 MB unused
Warning::
https://search.worldcat.org/_next/static/chunks/81...: 389 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://search.worldcat.org/_next/static/chunks/81...: 389 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://search.worldcat.org/_next/static/chunks/58...: 225 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://search.worldcat.org/_next/static/chunks/58...: 225 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://search.worldcat.org/_next/static/chunks/pa...: 104 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.1 MB
2110 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://search.worldcat.org/_next/static/chunks/81-9089fe14406a16cb.js161 KB389 KB (70%)✓3rd
https://search.worldcat.org/_next/static/chunks/81-9089fe14406a16cb.js0 KB389 KB (70%)✓3rd
https://search.worldcat.org/_next/static/chunks/58474bfb-5251dc1630dc5126.js99 KB225 KB (71%)✓3rd
https://search.worldcat.org/_next/static/chunks/58474bfb-5251dc1630dc5126.js0 KB225 KB (71%)✓3rd
https://search.worldcat.org/_next/static/chunks/pages/_app-179c87dcd1fa8d64.js328 KB104 KB (32%)✓3rd
https://search.worldcat.org/_next/static/chunks/1d2671aa-f600276eb687cd2d.js0 KB98 KB (51%)✓3rd
https://search.worldcat.org/_next/static/chunks/1d2671aa-f600276eb687cd2d.js44 KB98 KB (51%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202503.1.0/otBannerSdk.js116 KB64 KB (55%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T78H6Q6142 KB55 KB (39%)✓3rd
https://search.worldcat.org/_next/static/chunks/pages/lists/%5BlistId%5D-0b27c484aa752a8b.js0 KB51 KB (97%)✓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

F
Page Weight Inventory
Action
125 resources · 2.2 MB · 2.1 MB savings available
FIX
125 resources · 2.2 MB · 2.1 MB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~2.1 MB of savings available
Warning::
124 third-party resources (100% of weight)
Info::
1 resources over 200KB
125 resources · 2.2 MiB · 124 third-party 1.2 MiB over 1MB target
JavaScript 60% · 1.3 MiB
Font 18% · 408.6 KiB
Image 13% · 299.6 KiB
Other 4% · 98.2 KiB
Document 4% · 94.9 KiB
CSS 0% · 6.7 KiB

~2.1 MiB of savings available

Remove unused JavaScript: 2.1 MiB
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
Image Optimization
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Info::
All images are well-optimized
26 images 295 KB
0 oversized -0 KB
9 legacy format
0 missing dimensions CLS risk
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
4 fonts (409 KB)
PASS
4 fonts (409 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

409 KB total

Render-blocking

0

of 4

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 4.9 s LCP 16.2 shttps://search.worldcat.org/inter/Inter-Regular.woff2?v=3.19Inter-Regular.woff2 https://search.worldcat.org/inter/Inter-Regular.woff2?v=3.19 — 97.0 KiB — 259 ms — font-display: swaphttps://search.worldcat.org/inter/Inter-Bold.woff2?v=3.19Inter-Bold.woff2 https://search.worldcat.org/inter/Inter-Bold.woff2?v=3.19 — 104.0 KiB — 288 ms — font-display: swaphttps://search.worldcat.org/inter/Inter-Medium.woff2?v=3.19Inter-Medium.woff2 https://search.worldcat.org/inter/Inter-Medium.woff2?v=3.19 — 103.8 KiB — 281 ms — font-display: swaphttps://search.worldcat.org/inter/Inter-SemiBold.woff2?v=3.19Inter-SemiBold.woff2 https://search.worldcat.org/inter/Inter-SemiBold.woff2?v=3.19 — 103.7 KiB — 335 ms — font-display: swap
Inter-Regular.woff2 woff2 swap
Size 97 KB
Load time 259 ms
Start 778 ms
Risk FOUT — text flashes from fallback to web font
Inter-Bold.woff2 woff2 swap
Size 104 KB
Load time 288 ms
Start 779 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Inter-Medium.woff2 woff2 swap
Size 104 KB
Load time 281 ms
Start 779 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Inter-SemiBold.woff2 woff2 swap
Size 104 KB
Load time 335 ms
Start 779 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~156 KB and ~312 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
21 hints, 0 missing preconnects
PASS
21 hints, 0 missing preconnects
Info::
Page uses 21 resource hint(s)

Current Resource Hints

preconnect
3
preload
—
dns-prefetch
—
prefetch
+8
18

21 resource hints configured

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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
125 requests over 2676ms
INFO
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 4.9 s LCP 16.2 shttps://worldcat.org// https://worldcat.org/ — 301 — 522 B — 179 ms — h2https://search.worldcat.org/search.worldcat.org/ https://search.worldcat.org/ — 200 — 94.9 KiB — 532 ms — h2https://cdn.cookielaw.org/consent/3b9b6a99-a8b7-4b31-a427-748bf51c2056/OtAutoBlock.jscdn.cookielaw.org/consent/3b9b6a99-... https://cdn.cookielaw.org/consent/3b9b6a99-a8b7-4b31-a427-748bf51c2056/OtAutoBlock.js — 200 — 4.5 KiB — 99 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 87 ms — h2https://search.worldcat.org/inter.csssearch.worldcat.org/inter.css https://search.worldcat.org/inter.css — 200 — 1.3 KiB — 176 ms — h2https://search.worldcat.org/survey-monkey.csssearch.worldcat.org/survey-monkey.c... https://search.worldcat.org/survey-monkey.css — 200 — 1.0 KiB — 194 ms — h2https://search.worldcat.org/favicons/site.webmanifestsearch.worldcat.org/favicons/site.w... https://search.worldcat.org/favicons/site.webmanifest — 200 — 1.1 KiB — 536 ms — h2https://cdn.cookielaw.org/consent/3b9b6a99-a8b7-4b31-a427-748bf51c2056/3b9b6a99-a8b7-4b31-a427-748bf51c2056.jsoncdn.cookielaw.org/consent/3b9b6a99-... https://cdn.cookielaw.org/consent/3b9b6a99-a8b7-4b31-a427-748bf51c2056/3b9b6a99-a8b7-4b31-a427-748bf51c2056.json — 200 — 2.5 KiB — 74 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 303 B — 82 ms — h2https://search.worldcat.org/_next/static/chunks/webpack-1bfc276169d296a9.jssearch.worldcat.org/_next/static/ch... https://search.worldcat.org/_next/static/chunks/webpack-1bfc276169d296a9.js — 200 — 3.3 KiB — 46 ms — h2https://search.worldcat.org/_next/static/chunks/framework-378c8f1031e2e5b2.jssearch.worldcat.org/_next/static/ch... https://search.worldcat.org/_next/static/chunks/framework-378c8f1031e2e5b2.js — 200 — 58.6 KiB — 55 ms — h2https://search.worldcat.org/_next/static/chunks/main-ac5ca2eebc7ba9d0.jssearch.worldcat.org/_next/static/ch... https://search.worldcat.org/_next/static/chunks/main-ac5ca2eebc7ba9d0.js — 200 — 39.6 KiB — 69 ms — h2https://search.worldcat.org/_next/static/chunks/pages/_app-179c87dcd1fa8d64.jssearch.worldcat.org/_next/static/ch... https://search.worldcat.org/_next/static/chunks/pages/_app-179c87dcd1fa8d64.js — 200 — 327.8 KiB — 96 ms — h2https://search.worldcat.org/_next/static/chunks/86f38aeb-455313cf25bb11a7.jssearch.worldcat.org/_next/static/ch... https://search.worldcat.org/_next/static/chunks/86f38aeb-455313cf25bb11a7.js — 200 — 17.6 KiB — 56 ms — h2https://search.worldcat.org/_next/static/chunks/4163-dd9706b6c3d6413d.jssearch.worldcat.org/_next/static/ch... https://search.worldcat.org/_next/static/chunks/4163-dd9706b6c3d6413d.js — 200 — 77.9 KiB — 91 ms — h2https://search.worldcat.org/_next/static/chunks/2123-dd0ae7b8cba395b9.jssearch.worldcat.org/_next/static/ch... https://search.worldcat.org/_next/static/chunks/2123-dd0ae7b8cba395b9.js — 200 — 4.6 KiB — 65 ms — h2https://search.worldcat.org/_next/static/chunks/9560-345ad60da3f10115.jssearch.worldcat.org/_next/static/ch... https://search.worldcat.org/_next/static/chunks/9560-345ad60da3f10115.js — 200 — 8.1 KiB — 90 ms — h2https://search.worldcat.org/_next/static/chunks/2281-aac954120f409c15.jssearch.worldcat.org/_next/static/ch... https://search.worldcat.org/_next/static/chunks/2281-aac954120f409c15.js — 200 — 5.3 KiB — 90 ms — h2https://search.worldcat.org/_next/static/chunks/pages/index-6c78cc84a2744c79.jssearch.worldcat.org/_next/static/ch... https://search.worldcat.org/_next/static/chunks/pages/index-6c78cc84a2744c79.js — 200 — 6.9 KiB — 90 ms — h2https://search.worldcat.org/_next/static/v1.1.100-42-g7026db89/_buildManifest.jssearch.worldcat.org/_next/static/v1... https://search.worldcat.org/_next/static/v1.1.100-42-g7026db89/_buildManifest.js — 200 — 2.8 KiB — 90 ms — h2https://search.worldcat.org/_next/static/v1.1.100-42-g7026db89/_ssgManifest.jssearch.worldcat.org/_next/static/v1... https://search.worldcat.org/_next/static/v1.1.100-42-g7026db89/_ssgManifest.js — 200 — 393 B — 90 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-T78H6Q6www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-T78H6Q6 — 200 — 141.5 KiB — 169 ms — h2data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzNjQiIGhla…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzNjQiIGhla… — 200 — 0 B — 0 ms — datadata:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAoHBwgHBgoICAgLFgoLDhgVDg0VGh0QHR0YJh8cGx4m…data:image/jpeg;base64,/9j/4AAQSkZJ... 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datadata:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAoHBwgHBgoTDwgLDRIPDhgNDg0OFxcNDQ0WFxUZGBYV…data:image/jpeg;base64,/9j/4AAQSkZJ... data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAoHBwgHBgoTDwgLDRIPDhgNDg0OFxcNDQ0WFxUZGBYV… — 200 — 0 B — 0 ms — datahttps://cdn.cookielaw.org/scripttemplates/202503.1.0/otBannerSdk.jscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202503.1.0/otBannerSdk.js — 200 — 115.9 KiB — 51 ms — h2https://search.worldcat.org/_next/image?url=https%3A%2F%2Fwww.datocms-assets.com%2F29926%2F1617727156-header-nocolor-bg.png%3Fw%3D960&w=960&q=75search.worldcat.org/_next/image?url... https://search.worldcat.org/_next/image?url=https%3A%2F%2Fwww.datocms-assets.com%2F29926%2F1617727156-header-nocolor-bg.png%3Fw%3D960&w=960&q=75 — 400 — 43 B — 184 ms — h2
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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 6911ms · 860KB · €75/mo
search.worldcat.org
Other
Costly
Execution 2185ms
Transfer 59 KB
Unused 35%
Monthly Cost €24/mo
search.worldcat.org
Other
Costly
Execution 916ms
Transfer 95 KB
Monthly Cost €10/mo
Unattributable
Other
Costly
Execution 623ms
Transfer 0 KB
Monthly Cost €7/mo
OneTrust
Consent
Essential
Execution 568ms
Transfer 116 KB
Unused 55%
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Costly
Execution 438ms
Transfer 142 KB
Unused 39%
Monthly Cost €5/mo
search.worldcat.org
Other
Costly
Execution 434ms
Transfer 328 KB
Unused 32%
Monthly Cost €5/mo
search.worldcat.org
Other
Costly
Execution 393ms
Transfer 0 KB
Unused 70%
Monthly Cost €4/mo
search.worldcat.org
Other
Costly
Execution 332ms
Transfer 25 KB
Monthly Cost €4/mo
search.worldcat.org
Other
Costly
Execution 255ms
Transfer 40 KB
Monthly Cost €3/mo
search.worldcat.org
Other
Costly
Execution 252ms
Transfer 0 KB
Monthly Cost €3/mo
search.worldcat.org
Other
Optional
Execution 139ms
Transfer 2 KB
Monthly Cost €2/mo
js-agent.newrelic.com
Other
Optional
Execution 138ms
Transfer 31 KB
Monthly Cost €2/mo
search.worldcat.org
Other
Optional
Execution 113ms
Transfer 7 KB
Monthly Cost €1/mo
OneTrust
Consent
Essential
Execution 72ms
Transfer 9 KB
Monthly Cost €1/mo
static.cloudflareinsights.com
Other
Optional
Execution 54ms
Transfer 7 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • search.worldcat.org adds 2185ms and costs ~€24/month
  • search.worldcat.org adds 916ms and costs ~€10/month
  • Unattributable adds 623ms and costs ~€7/month
  • Google Tag Manager adds 438ms and costs ~€5/month
  • search.worldcat.org adds 434ms and costs ~€5/month
  • search.worldcat.org adds 393ms and costs ~€4/month
  • search.worldcat.org adds 332ms and costs ~€4/month
  • search.worldcat.org adds 255ms and costs ~€3/month
  • search.worldcat.org adds 252ms 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

search.worldcat.org takes 2185ms 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

search.worldcat.org takes 916ms 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 623ms 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 OneTrust'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

Google Tag Manager takes 438ms 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

search.worldcat.org takes 434ms 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

search.worldcat.org takes 393ms 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

70% of search.worldcat.org'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

search.worldcat.org takes 332ms 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

search.worldcat.org takes 255ms 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

search.worldcat.org takes 252ms 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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