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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
3
REVIEW
3
PASS
9
INFO
2

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

Mobile Desktop
53
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

1.13 s

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

6.53 s

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

185 ms

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

0.383

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

4.68 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.

7.73 s

Page Load Progression

380 ms
760 ms
1.1 s
1.5 s
1.9 s
2.3 s
2.7 s
3.0 s
Checks
17
9 PASS 3 REVIEW 3 FIX
D
Third-Party Impact
Action
65% third-party, 0 ms blocking
FIX
65% third-party, 0 ms blocking
Warning::
Third-party code accounts for 65% of page weight (686.9 KiB of 1.0 MiB)
Info::
Third-party blocking time is low (0 ms)
35%
65%
First-party Third-party
D
JS Execution Cost
Action
3385ms total JS execution
FIX
3385ms total JS execution
Warning::
https://openlibrary.org/: 1700ms CPU time
Warning::
Unattributable: 651ms CPU time
Warning::
https://openlibrary.org/static/build/js/2857.7ae03...: 471ms CPU time
Warning::
https://openlibrary.org/static/build/js/all.js?v=c...: 445ms CPU time
Info::
https://openlibrary.org/static/build/js/8839.f8f23...: 118ms CPU time
Info::
Third-party scripts: 651ms (19% of total)

Main Thread Breakdown

Other 30% Rendering 25% Script Evaluation 23% Style & Layout 17%
ScriptTotalScriptingParse/CompileParty
https://openlibrary.org/1700ms31ms3ms1st
Unattributable651ms17ms0ms3rd
https://openlibrary.org/static/build/js/2857.7ae0375d1586d91aa993.js471ms265ms5ms1st
https://openlibrary.org/static/build/js/all.js?v=cccd60a93dcd70f37d029dbeae972d11445ms297ms28ms1st
https://openlibrary.org/static/build/js/8839.f8f2392b6c71d38f2475.js118ms76ms7ms1st
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
68 images, 0 KB saveable
REVIEW
68 images, 0 KB saveable
Warning::
https://covers.openlibrary.org/b/id/6577620-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/15213202-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openlibrary.org/static/images/onboarding/f... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/8011068-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/8295312-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/8174154-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openlibrary.org/static/images/ia-logo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/15206128-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/2640456-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openlibrary.org/static/images/onboarding/r... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openlibrary.org/static/images/onboarding/f... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/15143630-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/8351540-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openlibrary.org/static/images/onboarding/v... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openlibrary.org/images/ajax-loader-bar.gif is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/12622155-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/12621740-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/15200982-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/15178699-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openlibrary.org/static/images/hamburger-ic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openlibrary.org/static/images/onboarding/r... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/1129099-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/12659488-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openlibrary.org/static/images/onboarding/l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openlibrary.org/static/images/onboarding/l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/7361792-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openlibrary.org/static/images/language-ico... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/6875249-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openlibrary.org/static/images/onboarding/t... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/12621834-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/6691721-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/1738958-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/8788253-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://covers.openlibrary.org/b/id/11464624-M.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
68 images 460 KB
0 oversized -0 KB
57 legacy format
36 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

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

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

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

Performance issues directly impact user engagement and conversion rates.

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

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

B
JS Bundles
20 scripts, 83 KB unused
REVIEW
20 scripts, 83 KB unused
Warning::
https://apollo.archive.org/js/container_7cLc1b4U.j...: 50 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://openlibrary.org/static/build/js/all.js?v=c...: 33 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 83 KB
83 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://apollo.archive.org/js/container_7cLc1b4U.js127 KB50 KB (39%)✓3rd
https://openlibrary.org/static/build/js/all.js?v=cccd60a93dcd70f37d029dbeae972d11101 KB33 KB (32%)✓1st
https://openlibrary.org/static/build/js/9139.9a08174e20677e88d2a7.js4 KB—✓1st
https://openlibrary.org/static/build/js/7351.49e256343cb2f9d362ac.js4 KB—✓1st
https://openlibrary.org/static/build/lit-components/production/ol-components.js?v=64849828a6795e0b913e17b7b244541216 KB—✓1st
data:text/javascript,"ol-components.js";if(!import.meta.resolve)throw Error("import.meta.resolve no…0 KB—✓3rd
https://openlibrary.org/static/build/js/2857.7ae0375d1586d91aa993.js13 KB—✓1st
https://openlibrary.org/static/build/js/carousel.ff56af1932ab614d304f.js5 KB—✓1st
https://openlibrary.org/static/build/js/8839.f8f2392b6c71d38f2475.js22 KB—✓1st
https://openlibrary.org/static/build/js/graphs.08c7354f02b6a73ece8c.js2 KB—✓1st

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
1.0 MB transferred, 112 requests
PASS
1.0 MB transferred, 112 requests
Info::
Page weighs 1.7 MB (1.0 MB transferred)
Warning::
112 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.22 g CO2 per page load
1.0 MB / 2.4 MB budget
1.0 MB transferred
112 requests
0.22 g CO2 per page load
JavaScript 494.0 KiB 47%
Images 459.5 KiB 44%
Fonts 28.7 KiB 3%
Other 25.0 KiB 2%
CSS 19.0 KiB 2%
HTML 17.7 KiB 2%
Other 5.4 KiB 1%
Other 1.2 KiB 0%
Other 720 B 0%
0 2.4 MB 4.9 MB
Under budget

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

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
1 fonts (29 KB)
PASS
1 fonts (29 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

29 KB total

Render-blocking

0

of 1

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 1.1 s LCP 6.5 shttps://archive.org/includes/fonts/Iconochive-Regular.woffIconochive-Regular.woff https://archive.org/includes/fonts/Iconochive-Regular.woff — 28.7 KiB — 157 ms — font-display: swap
Iconochive-Regular.woff woff swap
Size 29 KB
Load time 157 ms
Start 2.5 s
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 ~9 KB and ~18 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 resource hints configured

A
Page Weight Inventory
112 resources · 1.0 MB · 83 KB savings available
PASS
112 resources · 1.0 MB · 83 KB savings available
Warning::
Page weight 27 KB over 1MB target
Got: 1.0 MB Expected: ≤ 1 MB
Info::
~83 KB of savings available
Warning::
58 third-party resources (65% of weight)
112 resources · 1.0 MiB · 58 third-party 27.3 KiB over 1MB target
JavaScript 47% · 494.0 KiB
Image 46% · 485.0 KiB
Font 3% · 28.7 KiB
CSS 2% · 19.0 KiB
Document 2% · 17.7 KiB
Other 1% · 6.9 KiB

~82.6 KiB of savings available

Remove unused JavaScript: 82.6 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
112 requests over 3390ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 1.1 s LCP 6.5 shttps://openlibrary.org// https://openlibrary.org/ — 200 — 13.7 KiB — 960 ms — h2https://openlibrary.org/static/build/css/tokens.css?v=ead7e2b204f0e69876050eb27ea65993/static/build/css/tokens.css?v=ead7... https://openlibrary.org/static/build/css/tokens.css?v=ead7e2b204f0e69876050eb27ea65993 — 200 — 2.4 KiB — 153 ms — h2https://openlibrary.org/static/build/css/page-home.css?v=26497e281d076c08a8ce6d9f3a370054/static/build/css/page-home.css?v=2... https://openlibrary.org/static/build/css/page-home.css?v=26497e281d076c08a8ce6d9f3a370054 — 200 — 9.0 KiB — 155 ms — h2https://openlibrary.org/cdn/archive.org/donate.js/cdn/archive.org/donate.js https://openlibrary.org/cdn/archive.org/donate.js — 200 — 3.8 KiB — 304 ms — h2https://openlibrary.org/static/images/ia-logo.svg/static/images/ia-logo.svg https://openlibrary.org/static/images/ia-logo.svg — 200 — 9.4 KiB — 156 ms — h2https://openlibrary.org/static/images/language-icon.svg/static/images/language-icon.svg https://openlibrary.org/static/images/language-icon.svg — 200 — 1.4 KiB — 157 ms — h2https://openlibrary.org/static/build/lit-components/production/ol-components.js?v=64849828a6795e0b913e17b7b2445412/static/build/lit-components/produc... https://openlibrary.org/static/build/lit-components/production/ol-components.js?v=64849828a6795e0b913e17b7b2445412 — 200 — 15.6 KiB — 302 ms — h2https://openlibrary.org/static/images/hamburger-icon.svg/static/images/hamburger-icon.svg https://openlibrary.org/static/images/hamburger-icon.svg — 200 — 548 B — 154 ms — h2https://openlibrary.org/static/images/onboarding/read.png/static/images/onboarding/read.png https://openlibrary.org/static/images/onboarding/read.png — 200 — 3.0 KiB — 160 ms — h2https://openlibrary.org/static/images/onboarding/reading_goal.svg/static/images/onboarding/reading_g... https://openlibrary.org/static/images/onboarding/reading_goal.svg — 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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
19% of JavaScript execution is third-party
First-party Third-party 651ms · 0KB · $9/mo
Unattributable
Other
Costly
Execution 651ms
Transfer 0 KB
Monthly Cost $9/mo

These scripts may cost more than they're worth

  • Unattributable adds 651ms and costs ~$9/month

Unattributable takes 651ms 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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