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https://worldcat.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
72
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.
73
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.

1.10 s

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

2.31 s

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

228 ms

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

0.001

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

2.55 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.

3.53 s

Page Load Progression

451 ms
901 ms
1.4 s
1.8 s
2.3 s
2.7 s
3.2 s
3.6 s
Checks
15
6 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
2.7 MB transferred, 180 requests
FIX
2.7 MB transferred, 180 requests
Warning::
Page weighs 7.8 MB (2.7 MB transferred)
Warning::
JavaScript is 919 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 919 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::
180 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.57 g CO2 per page load
2.7 MB / 2.4 MB budget
2.7 MB transferred
180 requests
0.57 g CO2 per page load
JavaScript 919.3 KiB 33%
Images 559.5 KiB 20%
Other 529.7 KiB 19%
Fonts 408.6 KiB 15%
Other 279.6 KiB 10%
HTML 95.0 KiB 3%
Other 5.3 KiB 0%
CSS 2.4 KiB 0%
Other 1.1 KiB 0%
0 2.4 MB 4.9 MB
Over 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

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 (2.7 MiB of 2.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
98 scripts, 2.3 MB unused
FIX
98 scripts, 2.3 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...: 105 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.3 MB
2336 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://search.worldcat.org/_next/static/chunks/81-9089fe14406a16cb.js0 KB389 KB (70%)✓3rd
https://search.worldcat.org/_next/static/chunks/81-9089fe14406a16cb.js161 KB389 KB (70%)✓3rd
https://search.worldcat.org/_next/static/chunks/58474bfb-5251dc1630dc5126.js98 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 KB105 KB (32%)✓3rd
https://search.worldcat.org/_next/static/chunks/1d2671aa-f600276eb687cd2d.js44 KB98 KB (51%)✓3rd
https://search.worldcat.org/_next/static/chunks/1d2671aa-f600276eb687cd2d.js0 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
180 resources · 2.7 MB · 2.3 MB savings available
FIX
180 resources · 2.7 MB · 2.3 MB savings available
Warning::
Page weight 1.7 MB over 1MB target
Got: 2.7 MB Expected: ≤ 1 MB
Info::
~2.3 MB of savings available
Warning::
179 third-party resources (100% of weight)
Info::
1 resources over 200KB
180 resources · 2.7 MiB · 179 third-party 1.7 MiB over 1MB target
JavaScript 52% · 1.4 MiB
Image 20% · 564.2 KiB
Font 15% · 408.6 KiB
Other 10% · 281.4 KiB
Document 3% · 95.0 KiB
CSS 0% · 6.7 KiB

~2.3 MiB of savings available

Remove unused JavaScript: 2.3 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
40 images, 0 KB saveable
REVIEW
40 images, 0 KB saveable
Info::
All images are well-optimized
40 images 560 KB
0 oversized -0 KB
18 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1965ms total JS execution
REVIEW
1965ms total JS execution
Warning::
https://search.worldcat.org/_next/static/chunks/fr...: 618ms CPU time
Warning::
https://search.worldcat.org/: 326ms CPU time
Info::
Unattributable: 242ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202503.1...: 144ms CPU time
Info::
https://search.worldcat.org/_next/static/chunks/ma...: 120ms CPU time
Warning::
Third-party scripts: 1965ms (100% of total)

Main Thread Breakdown

Script Evaluation 69% Other 15% Script Parsing & Compilation 7% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
https://search.worldcat.org/_next/static/chunks/framework-378c8f1031e2e5b2.js618ms583ms4ms3rd
https://search.worldcat.org/326ms125ms5ms3rd
Unattributable242ms28ms0ms3rd
https://cdn.cookielaw.org/scripttemplates/202503.1.0/otBannerSdk.js144ms98ms28ms3rd
https://search.worldcat.org/_next/static/chunks/main-ac5ca2eebc7ba9d0.js120ms102ms3ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T78H6Q6115ms102ms9ms3rd
https://search.worldcat.org/_next/static/chunks/81-9089fe14406a16cb.js110ms97ms12ms3rd
https://search.worldcat.org/_next/static/chunks/pages/_app-179c87dcd1fa8d64.js99ms71ms28ms3rd
https://search.worldcat.org/_next/static/chunks/2391.aede3f03048b823f.js67ms62ms1ms3rd
https://search.worldcat.org/_next/static/chunks/2203.1f6389aa1ccb9429.js62ms53ms0ms3rd

Showing top 10 of 11 scripts

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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 2.3 shttps://search.worldcat.org/inter/Inter-Regular.woff2?v=3.19Inter-Regular.woff2 https://search.worldcat.org/inter/Inter-Regular.woff2?v=3.19 — 96.9 KiB — 294 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 — 328 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 — 103.8 KiB — 295 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 — 382 ms — font-display: swap
Inter-Regular.woff2 woff2 swap
Size 97 KB
Load time 294 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
Inter-Medium.woff2 woff2 swap
Size 104 KB
Load time 328 ms
Start 1.1 s
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 295 ms
Start 1.1 s
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-Bold.woff2 woff2 swap
Size 104 KB
Load time 382 ms
Start 1.1 s
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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
180 requests over 3310ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 2.3 shttps://worldcat.org// https://worldcat.org/ — 301 — 522 B — 173 ms — h2https://search.worldcat.org/search.worldcat.org/ https://search.worldcat.org/ — 200 — 95.0 KiB — 799 ms — h2https://search.worldcat.org/favicons/site.webmanifestsearch.worldcat.org/favicons/site.w... https://search.worldcat.org/favicons/site.webmanifest — 200 — 1.1 KiB — 206 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 — 82 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 69 ms — h2https://search.worldcat.org/inter.csssearch.worldcat.org/inter.css https://search.worldcat.org/inter.css — 200 — 1.3 KiB — 182 ms — h2https://search.worldcat.org/survey-monkey.csssearch.worldcat.org/survey-monkey.c... https://search.worldcat.org/survey-monkey.css — 200 — 1.0 KiB — 191 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 — 79 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 303 B — 73 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 — 63 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 — 73 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 — 98 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 — 112 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 — 83 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 — 96 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 — 4.5 KiB — 79 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 — 87 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 — 66 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 — 7.0 KiB — 91 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 — 77 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 — 385 B — 99 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 — 153 ms — h2https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c1241717689176015static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c1241717689176015 — 200 — 6.9 KiB — 74 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... data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAoHBwgHBgoICAgLFgoLDhgVDg0VGh0QHR0YJh8cGx4m… — 200 — 0 B — 0 ms — datadata:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAoHBwgHBgoICAgLCgoLDhgVDRAZDh0VDQ0OFx0dGBYV…data:image/jpeg;base64,/9j/4AAQSkZJ... data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAoHBwgHBgoICAgLCgoLDhgVDRAZDh0VDQ0OFx0dGBYV… — 200 — 0 B — 0 ms — datadata:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAoHBwgHBgoICAgXCgoLDhgQDg0NDhEVFhEVFx8lGBYT…data:image/jpeg;base64,/9j/4AAQSkZJ... data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAoHBwgHBgoICAgXCgoLDhgQDg0NDhEVFhEVFx8lGBYT… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0NTIiIGhla…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0NTIiIGhla… — 200 — 0 B — 0 ms — 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://search.worldcat.org/_next/image?url=https%3A%2F%2Fwww.datocms-assets.com%2F29926%2F1617727156-header-nocolor-bg.png%3Fh%3D299%26w%3D1440&w=1440&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%3Fh%3D299%26w%3D1440&w=1440&q=75 — 200 — 18.5 KiB — 596 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 1965ms · 806KB · €21/mo
search.worldcat.org
Other
Costly
Execution 618ms
Transfer 59 KB
Unused 35%
Monthly Cost €7/mo
search.worldcat.org
Other
Costly
Execution 326ms
Transfer 95 KB
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 242ms
Transfer 0 KB
Monthly Cost €3/mo
OneTrust
Consent
Essential
Execution 144ms
Transfer 116 KB
Unused 55%
Monthly Cost €2/mo
search.worldcat.org
Other
Optional
Execution 120ms
Transfer 40 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 115ms
Transfer 142 KB
Unused 39%
Monthly Cost €1/mo
search.worldcat.org
Other
Optional
Execution 110ms
Transfer 0 KB
Unused 70%
Monthly Cost €1/mo
search.worldcat.org
Other
Optional
Execution 99ms
Transfer 328 KB
Unused 32%
Monthly Cost €1/mo
search.worldcat.org
Other
Optional
Execution 67ms
Transfer 25 KB
Monthly Cost €1/mo
search.worldcat.org
Other
Optional
Execution 62ms
Transfer 2 KB
Monthly Cost €1/mo
search.worldcat.org
Other
Optional
Execution 61ms
Transfer 0 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • search.worldcat.org adds 618ms and costs ~€7/month
  • search.worldcat.org adds 326ms and costs ~€4/month
  • Unattributable adds 242ms 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 618ms 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 326ms 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 242ms 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

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

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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