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https://openlibrary.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
2
REVIEW
5
PASS
6
INFO
2

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

Mobile Desktop
80
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.

375 ms

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

1.58 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.

0.272

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

1.30 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.

1.60 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
6 PASS 5 REVIEW 2 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
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
Page Weight Budget
1.0 MB transferred, 118 requests
REVIEW
1.0 MB transferred, 118 requests
Info::
Page weighs 1.7 MB (1.0 MB transferred)
Warning::
118 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
118 requests
0.22 g CO2 per page load
JavaScript 494.0 KiB 47%
Images 470.5 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

C
Image Optimization
Action
74 images, 0 KB saveable
REVIEW
74 images, 0 KB saveable
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://openlibrary.org/static/images/github.svg 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/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://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://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/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/8351540-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/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/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/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/15206128-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/15178699-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/7361792-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::
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/6875249-M.jpg 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::
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://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/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/1738958-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/l... 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.
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/static/images/bsky.svg 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://openlibrary.org/static/images/tweet.svg 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://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/8011068-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/onboarding/f... 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/l... 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.
74 images 470 KB
0 oversized -0 KB
63 legacy format
39 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

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

B
JS Execution Cost
724ms total JS execution
REVIEW
724ms total JS execution
Warning::
https://openlibrary.org/: 439ms CPU time
Info::
Unattributable: 144ms CPU time
Info::
https://openlibrary.org/static/build/js/all.js?v=c...: 85ms CPU time
Info::
https://openlibrary.org/static/build/js/carousel.f...: 56ms CPU time
Info::
Third-party scripts: 144ms (20% of total)

Main Thread Breakdown

Rendering 32% Other 31% Script Evaluation 18% Style & Layout 15%
ScriptTotalScriptingParse/CompileParty
https://openlibrary.org/439ms7ms1ms1st
Unattributable144ms4ms0ms3rd
https://openlibrary.org/static/build/js/all.js?v=cccd60a93dcd70f37d029dbeae972d1185ms58ms6ms1st
https://openlibrary.org/static/build/js/carousel.ff56af1932ab614d304f.js56ms32ms1ms1st
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 (33%)
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 (33%)✓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+
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 500 ms 1.0 s 1.5 s 2.0 s FCP 375 ms LCP 1.6 shttps://archive.org/includes/fonts/Iconochive-Regular.woffIconochive-Regular.woff https://archive.org/includes/fonts/Iconochive-Regular.woff — 28.7 KiB — 201 ms — font-display: swap
Iconochive-Regular.woff woff swap
Size 29 KB
Load time 201 ms
Start 2.2 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
118 resources · 1.0 MB · 83 KB savings available
PASS
118 resources · 1.0 MB · 83 KB savings available
Warning::
Page weight 38 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)
118 resources · 1.0 MiB · 58 third-party 38.3 KiB over 1MB target
Image 47% · 496.0 KiB
JavaScript 47% · 494.0 KiB
Font 3% · 28.7 KiB
CSS 2% · 19.0 KiB
Document 2% · 17.7 KiB
Other 1% · 6.9 KiB

~82.8 KiB of savings available

Remove unused JavaScript: 82.8 KiB
Network Waterfall
118 requests over 2831ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 375 ms LCP 1.6 shttps://openlibrary.org// https://openlibrary.org/ — 200 — 13.7 KiB — 600 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 — 151 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 — 153 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 — 302 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 — 299 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 — 300 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 — 155 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 — 153 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 — 154 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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