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https://escholarship.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
3
REVIEW
2
PASS
10
INFO
2

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

Mobile Desktop
48
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.

3.98 s

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

5.68 s

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

923 ms

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

0.018

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

3.98 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.

8.95 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
17
10 PASS 2 REVIEW 3 FIX
D
JS Execution Cost
Action
2892ms total JS execution
FIX
2892ms total JS execution
Warning::
https://escholarship.org/: 861ms CPU time
Warning::
https://escholarship.org/js/MathJax-3.2.2/es5/tex-...: 843ms CPU time
Warning::
Unattributable: 553ms CPU time
Warning::
https://escholarship.org/js/vendors~app-bundle-Bka...: 549ms CPU time
Info::
https://www.google-analytics.com/analytics.js: 87ms CPU time
Info::
Third-party scripts: 640ms (22% of total)

Main Thread Breakdown

Script Evaluation 49% Other 24% Style & Layout 13% Script Parsing & Compilation 9%
ScriptTotalScriptingParse/CompileParty
https://escholarship.org/861ms248ms4ms1st
https://escholarship.org/js/MathJax-3.2.2/es5/tex-chtml.js843ms579ms242ms1st
Unattributable553ms9ms0ms3rd
https://escholarship.org/js/vendors~app-bundle-BkaoERMG.js549ms523ms11ms1st
https://www.google-analytics.com/analytics.js87ms67ms11ms3rd
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.js257 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
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
B
Page Weight Budget
1.1 MB transferred, 26 requests
REVIEW
1.1 MB transferred, 26 requests
Info::
Page weighs 3.5 MB (1.1 MB transferred)
Warning::
JavaScript is 785 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 785 KB
Info::
26 HTTP requests
Info::
Estimated 0.22 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
26 requests
0.22 g CO2 per page load
JavaScript 785.1 KiB 73%
Fonts 170.0 KiB 16%
Images 72.7 KiB 7%
CSS 42.6 KiB 4%
HTML 5.2 KiB 0%
Other 2.2 KiB 0%
Other 452 B 0%
0 2.4 MB 4.9 MB
Under 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
2% third-party, 0 ms blocking
PASS
2% third-party, 0 ms blocking
Info::
Third-party code accounts for 2% of page weight (21.3 KiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
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
Image Optimization
11 images, 0 KB saveable
PASS
11 images, 0 KB saveable
Warning::
https://escholarship.org/images/logo_eschol-mobile... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 73 KB
0 oversized -0 KB
2 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

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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 4.0 s LCP 5.7 shttps://escholarship.org/fonts/SourceSansPro-Regular.ttf.woff2SourceSansPro-Regular.t... https://escholarship.org/fonts/SourceSansPro-Regular.ttf.woff2 — 85.3 KiB — 45 ms — font-display: swaphttps://escholarship.org/fonts/SourceSansPro-Light.ttf.woff2SourceSansPro-Light.ttf... https://escholarship.org/fonts/SourceSansPro-Light.ttf.woff2 — 84.8 KiB — 51 ms — font-display: swap
SourceSansPro-Regular.t... woff2 swap
Size 85 KB
Load time 45 ms
Start 333 ms
Risk FOUT — text flashes from fallback to web font
SourceSansPro-Light.ttf... woff2 swap
Size 85 KB
Load time 51 ms
Start 333 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
A
Page Weight Inventory
26 resources · 1.1 MB · 480 KB savings available
PASS
26 resources · 1.1 MB · 480 KB savings available
Warning::
Page weight 54 KB over 1MB target
Got: 1.1 MB Expected: ≤ 1 MB
Info::
~480 KB of savings available
Info::
11 third-party resources (2% of weight)
Info::
2 resources over 200KB
26 resources · 1.1 MiB · 11 third-party 54.3 KiB over 1MB target
JavaScript 73% · 785.1 KiB
Font 16% · 170.0 KiB
Image 7% · 75.0 KiB
CSS 4% · 42.6 KiB
Document 0% · 5.2 KiB
Other 0% · 452 B

~479.9 KiB of savings available

Remove unused JavaScript: 479.9 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
26 requests over 1089ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 4.0 s LCP 5.7 shttps://escholarship.org// https://escholarship.org/ — 200 — 5.2 KiB — 187 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 — 20 ms — http/1.1https://escholarship.org/images/logo_eschol-mobile.svg/images/logo_eschol-mobile.svg https://escholarship.org/images/logo_eschol-mobile.svg — 200 — 4.8 KiB — 19 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 — 68 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 — 38 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%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 — 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 — 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 — 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 — 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 — 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 — 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 — 22 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 — 31 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 — 31 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 — 30 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 — 50 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 — 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 — 45 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 — 51 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 — 16 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 — 256.6 KiB — 29 ms — http/1.1https://www.google-analytics.com/j/collect?v=1&_v=j102&aip=1&a=1383075923&t=pageview&_s=1&dl=https%3A%2F%2Fescholarship.org%2F&dp=%2F&ul=en-us&dt=eScholarship&sr=412x823&vp=412x823&_u=YEBAAEABAAAAACAAI~&jid=967023000&gjid=1758768642&cid=282818708.1776818014&tid=UA-26286226-1&_gid=1224923905.1776818014&_r=1&_slc=1&z=550683845www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&aip=1&a=1383075923&t=pageview&_s=1&dl=https%3A%2F%2Fescholarship.org%2F&dp=%2F&ul=en-us&dt=eScholarship&sr=412x823&vp=412x823&_u=YEBAAEABAAAAACAAI~&jid=967023000&gjid=1758768642&cid=282818708.1776818014&tid=UA-26286226-1&_gid=1224923905.1776818014&_r=1&_slc=1&z=550683845 — 200 — 452 B — 9 ms — h2https://escholarship.org/favicon.ico/favicon.ico https://escholarship.org/favicon.ico — 200 — 2.2 KiB — 157 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
22% of JavaScript execution is third-party
First-party Third-party 640ms · 21KB · $8/mo
Unattributable
Other
Costly
Execution 553ms
Transfer 0 KB
Monthly Cost $7/mo
Google Analytics
Analytics
Optional
Execution 87ms
Transfer 21 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 553ms and costs ~$7/month

Unattributable takes 553ms 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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