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https://escholarship.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
89
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.
91
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.

923 ms

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

1.68 s

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

130 ms

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

0.029

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

1.29 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.

2.02 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 4 REVIEW 3 FIX
D
JS Bundles
Action
4 scripts, 480 KB unused
FIX
4 scripts, 480 KB unused
Warning::
https://escholarship.org/js/vendors~app-bundle-Bka...: 302 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://escholarship.org/js/MathJax-3.2.2/es5/tex-...: 124 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://escholarship.org/js/app-bundle-Dm-AQQBA.js: 54 KB unused (85%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 480 KB
480 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://escholarship.org/js/vendors~app-bundle-BkaoERMG.js444 KB302 KB (68%)✓1st
https://escholarship.org/js/MathJax-3.2.2/es5/tex-chtml.js256 KB124 KB (49%)✓1st
https://escholarship.org/js/app-bundle-Dm-AQQBA.js64 KB54 KB (85%)✓1st
https://www.google-analytics.com/analytics.js21 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

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

D
Page Weight Inventory
Action
28 resources · 1.6 MB · 480 KB savings available
FIX
28 resources · 1.6 MB · 480 KB savings available
Warning::
Page weight 637 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~480 KB of savings available
Info::
12 third-party resources (27% of weight)
Info::
3 resources over 200KB
28 resources · 1.6 MiB · 12 third-party 636.6 KiB over 1MB target
JavaScript 47% · 784.4 KiB
Image 40% · 657.9 KiB
Font 10% · 170.0 KiB
CSS 3% · 42.6 KiB
Document 0% · 5.2 KiB
Other 0% · 452 B

~479.8 KiB of savings available

Remove unused JavaScript: 479.8 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store

DirectiveValueMeaning
no-store—Never cache this response
C
Page Weight Budget
Action
1.6 MB transferred, 28 requests
REVIEW
1.6 MB transferred, 28 requests
Info::
Page weighs 4.0 MB (1.6 MB transferred)
Warning::
JavaScript is 784 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 784 KB
Info::
28 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
28 requests
0.34 g CO2 per page load
JavaScript 784.4 KiB 47%
Images 655.7 KiB 39%
Fonts 170.0 KiB 10%
CSS 42.6 KiB 3%
HTML 5.2 KiB 0%
Other 2.2 KiB 0%
Other 452 B 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

B
Image Optimization
14 images, 0 KB saveable
REVIEW
14 images, 0 KB saveable
Warning::
https://escholarship.org/images/logo_escholarship.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
14 images 656 KB
0 oversized -0 KB
5 legacy format
1 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

B
JS Execution Cost
734ms total JS execution
REVIEW
734ms total JS execution
Info::
https://escholarship.org/: 235ms CPU time
Info::
https://escholarship.org/js/MathJax-3.2.2/es5/tex-...: 184ms CPU time
Info::
Unattributable: 180ms CPU time
Info::
https://escholarship.org/js/vendors~app-bundle-Bka...: 134ms CPU time
Info::
Third-party scripts: 180ms (25% of total)

Main Thread Breakdown

Script Evaluation 46% Other 28% Style & Layout 14% Script Parsing & Compilation 8% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://escholarship.org/235ms72ms1ms1st
https://escholarship.org/js/MathJax-3.2.2/es5/tex-chtml.js184ms134ms50ms1st
Unattributable180ms2ms0ms3rd
https://escholarship.org/js/vendors~app-bundle-BkaoERMG.js134ms127ms3ms1st
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Third-Party Impact
27% third-party, 0 ms blocking
PASS
27% third-party, 0 ms blocking
Info::
Third-party code accounts for 27% of page weight (451.7 KiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
73%
27%
First-party Third-party
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
2 fonts (170 KB)
PASS
2 fonts (170 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

170 KB total

Render-blocking

0

of 2

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 FCP 923 ms LCP 1.7 shttps://escholarship.org/fonts/SourceSansPro-Regular.ttf.woff2SourceSansPro-Regular.t... https://escholarship.org/fonts/SourceSansPro-Regular.ttf.woff2 — 85.3 KiB — 39 ms — font-display: swaphttps://escholarship.org/fonts/SourceSansPro-Light.ttf.woff2SourceSansPro-Light.ttf... https://escholarship.org/fonts/SourceSansPro-Light.ttf.woff2 — 84.8 KiB — 46 ms — font-display: swap
SourceSansPro-Regular.t... woff2 swap
Size 85 KB
Load time 39 ms
Start 852 ms
Risk FOUT — text flashes from fallback to web font
SourceSansPro-Light.ttf... woff2 swap
Size 85 KB
Load time 46 ms
Start 852 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
28 requests over 2648ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 923 ms LCP 1.7 shttps://escholarship.org// https://escholarship.org/ — 200 — 5.2 KiB — 715 ms — http/1.1https://escholarship.org/css/style-CHxXu1pc.css/css/style-CHxXu1pc.css https://escholarship.org/css/style-CHxXu1pc.css — 200 — 42.6 KiB — 10 ms — http/1.1https://escholarship.org/images/logo_escholarship.svg/images/logo_escholarship.svg https://escholarship.org/images/logo_escholarship.svg — 200 — 8.3 KiB — 23 ms — http/1.1https://escholarship.org/js/vendors~app-bundle-BkaoERMG.js/js/vendors~app-bundle-BkaoERMG.js https://escholarship.org/js/vendors~app-bundle-BkaoERMG.js — 200 — 443.6 KiB — 47 ms — http/1.1https://escholarship.org/js/app-bundle-Dm-AQQBA.js/js/app-bundle-Dm-AQQBA.js https://escholarship.org/js/app-bundle-Dm-AQQBA.js — 200 — 64.0 KiB — 29 ms — http/1.1data:image/svg+xml;charset=utf-8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20view…data:image/svg+xml;charset=utf-8,%3... data:image/svg+xml;charset=utf-8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20view… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20widt…data:image/svg+xml;charset=utf-8,%3... data:image/svg+xml;charset=utf-8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20widt… — 200 — 0 B — 0 ms — datahttps://escholarship.org/cms-assets/b75adad020e7f405fee9a9a298065ba64565a14e528b51eb0345d8fa481d1e4d/cms-assets/b75adad020e7f405fee9a9a... https://escholarship.org/cms-assets/b75adad020e7f405fee9a9a298065ba64565a14e528b51eb0345d8fa481d1e4d — 200 — 149.1 KiB — 545 ms — http/1.1data:image/svg+xml;charset=utf-8,%3Csvg%20width%3D%221792%22%20height%3D%221792%22%20viewBox%3D%220…data:image/svg+xml;charset=utf-8,%3... data:image/svg+xml;charset=utf-8,%3Csvg%20width%3D%221792%22%20height%3D%221792%22%20viewBox%3D%220… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg%20width%3D%221792%22%20height%3D%221792%22%20viewBox%3D%220…data:image/svg+xml;charset=utf-8,%3... data:image/svg+xml;charset=utf-8,%3Csvg%20width%3D%221792%22%20height%3D%221792%22%20viewBox%3D%220… — 200 — 0 B — 0 ms — datahttps://submit.escholarship.org/jschol_static/images/world-map-teal.svgsubmit.escholarship.org/jschol_stat... https://submit.escholarship.org/jschol_static/images/world-map-teal.svg — 200 — 418.8 KiB — 1.4 s — h2data:image/svg+xml;charset=utf-8,%3Csvg%20width%3D%221792%22%20height%3D%221792%22%20viewBox%3D%220…data:image/svg+xml;charset=utf-8,%3... data:image/svg+xml;charset=utf-8,%3Csvg%20width%3D%221792%22%20height%3D%221792%22%20viewBox%3D%220… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg%20width%3D%221792%22%20height%3D%221792%22%20viewBox%3D%220…data:image/svg+xml;charset=utf-8,%3... data:image/svg+xml;charset=utf-8,%3Csvg%20width%3D%221792%22%20height%3D%221792%22%20viewBox%3D%220… — 200 — 0 B — 0 ms — datahttps://submit.escholarship.org/jschol_static/images/california-map.svgsubmit.escholarship.org/jschol_stat... https://submit.escholarship.org/jschol_static/images/california-map.svg — 200 — 11.6 KiB — 1.2 s — h2data:image/svg+xml;charset=utf-8,%3Csvg%20width%3D%221792%22%20height%3D%221792%22%20viewBox%3D%220…data:image/svg+xml;charset=utf-8,%3... data:image/svg+xml;charset=utf-8,%3Csvg%20width%3D%221792%22%20height%3D%221792%22%20viewBox%3D%220… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg%20width%3D%222304%22%20height%3D%221792%22%20viewBox%3D%220…data:image/svg+xml;charset=utf-8,%3... data:image/svg+xml;charset=utf-8,%3Csvg%20width%3D%222304%22%20height%3D%221792%22%20viewBox%3D%220… — 200 — 0 B — 0 ms — datahttps://escholarship.org/images/homecover_CalAg.webp/images/homecover_CalAg.webp https://escholarship.org/images/homecover_CalAg.webp — 200 — 21.6 KiB — 40 ms — http/1.1https://escholarship.org/images/homecover_psf.webp/images/homecover_psf.webp https://escholarship.org/images/homecover_psf.webp — 200 — 16.2 KiB — 41 ms — http/1.1https://escholarship.org/images/homecover_sfews.webp/images/homecover_sfews.webp https://escholarship.org/images/homecover_sfews.webp — 200 — 11.7 KiB — 36 ms — http/1.1https://escholarship.org/images/homecover_jrws.webp/images/homecover_jrws.webp https://escholarship.org/images/homecover_jrws.webp — 200 — 6.4 KiB — 53 ms — http/1.1https://escholarship.org/images/homecover_aicrj.webp/images/homecover_aicrj.webp https://escholarship.org/images/homecover_aicrj.webp — 200 — 7.6 KiB — 52 ms — http/1.1https://escholarship.org/fonts/SourceSansPro-Regular.ttf.woff2/fonts/SourceSansPro-Regular.ttf.wo... https://escholarship.org/fonts/SourceSansPro-Regular.ttf.woff2 — 200 — 85.3 KiB — 39 ms — http/1.1https://escholarship.org/fonts/SourceSansPro-Light.ttf.woff2/fonts/SourceSansPro-Light.ttf.woff... https://escholarship.org/fonts/SourceSansPro-Light.ttf.woff2 — 200 — 84.8 KiB — 46 ms — http/1.1https://escholarship.org/images/logo_footer-eschol.svg/images/logo_footer-eschol.svg https://escholarship.org/images/logo_footer-eschol.svg — 200 — 4.3 KiB — 9 ms — http/1.1https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 17 ms — h2https://escholarship.org/js/MathJax-3.2.2/es5/tex-chtml.js/js/MathJax-3.2.2/es5/tex-chtml.js https://escholarship.org/js/MathJax-3.2.2/es5/tex-chtml.js — 200 — 255.9 KiB — 16 ms — http/1.1https://www.google-analytics.com/j/collect?v=1&_v=j102&aip=1&a=187110613&t=pageview&_s=1&dl=https%3A%2F%2Fescholarship.org%2F&dp=%2F&ul=en-us&dt=eScholarship&sr=800x600&vp=1350x940&_u=YEBAAEABAAAAACAAI~&jid=1359140135&gjid=464036584&cid=908167985.1776818032&tid=UA-26286226-1&_gid=937123900.1776818032&_r=1&_slc=1&z=1966215262www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&aip=1&a=187110613&t=pageview&_s=1&dl=https%3A%2F%2Fescholarship.org%2F&dp=%2F&ul=en-us&dt=eScholarship&sr=800x600&vp=1350x940&_u=YEBAAEABAAAAACAAI~&jid=1359140135&gjid=464036584&cid=908167985.1776818032&tid=UA-26286226-1&_gid=937123900.1776818032&_r=1&_slc=1&z=1966215262 — 200 — 452 B — 10 ms — h2https://escholarship.org/favicon.ico/favicon.ico https://escholarship.org/favicon.ico — 200 — 2.2 KiB — 410 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
25% of JavaScript execution is third-party
First-party Third-party 180ms · 0KB · $2/mo
Unattributable
Other
Optional
Execution 180ms
Transfer 0 KB
Monthly Cost $2/mo

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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