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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
58
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.
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.

3.53 s

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

6.94 s

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

322 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.

5.62 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.

10.75 s

Page Load Progression

1.7 s
3.3 s
5.0 s
6.7 s
8.3 s
10.0 s
11.7 s
13.3 s
Checks
17
8 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.8 MB transferred, 74 requests
FIX
3.8 MB transferred, 74 requests
Warning::
Page weighs 8.3 MB (3.8 MB transferred)
Warning::
JavaScript is 562 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 562 KB
Info::
74 HTTP requests
Info::
Estimated 0.81 g CO2 per page load
3.8 MB / 2.4 MB budget
3.8 MB transferred
74 requests
0.81 g CO2 per page load
Other 2.3 MiB 60%
Images 835.5 KiB 21%
JavaScript 562.0 KiB 14%
Fonts 72.4 KiB 2%
HTML 41.7 KiB 1%
CSS 26.5 KiB 1%
Other 21.1 KiB 1%
Other 1.8 KiB 0%
Other 617 B 0%
Other 452 B 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

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 (3.8 MiB of 3.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2971ms total JS execution
FIX
2971ms total JS execution
Warning::
https://www.ucpress.edu/: 871ms CPU time
Warning::
Unattributable: 571ms CPU time
Warning::
https://www.ucpress.edu/_next/static/chunks/2117-2...: 492ms CPU time
Warning::
https://www.ucpress.edu/_next/static/chunks/8629-2...: 369ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-4V7D...: 196ms CPU time
Warning::
Third-party scripts: 2971ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Other 22% Style & Layout 15% Script Parsing & Compilation 8% Rendering 7% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.ucpress.edu/871ms25ms26ms3rd
Unattributable571ms105ms0ms3rd
https://www.ucpress.edu/_next/static/chunks/2117-20652d18b489048f.js492ms429ms11ms3rd
https://www.ucpress.edu/_next/static/chunks/8629-2178701f3c2d0682.js369ms287ms81ms3rd
https://www.googletagmanager.com/gtag/js?id=G-4V7DMTJFQH&cx=c&gtm=4e64k0h1196ms149ms46ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWP2FC7175ms137ms29ms3rd
https://www.ucpress.edu/_next/static/chunks/fd9d1056-5bae34bee59f3468.js155ms133ms12ms3rd
https://www.ucpress.edu/_next/static/chunks/8463.930052e3b086997c.js88ms39ms3ms3rd
https://www.google-analytics.com/analytics.js53ms42ms4ms3rd
D
Page Weight Inventory
Action
74 resources · 3.8 MB · 134 KB savings available
FIX
74 resources · 3.8 MB · 134 KB savings available
Warning::
Page weight 2.8 MB over 1MB target
Got: 3.8 MB Expected: ≤ 1 MB
Info::
~134 KB of savings available
Warning::
73 third-party resources (100% of weight)
Info::
2 resources over 200KB
74 resources · 3.8 MiB · 73 third-party 2.8 MiB over 1MB target
Media 60% · 2.3 MiB
Image 21% · 836.4 KiB
JavaScript 14% · 562.0 KiB
Font 2% · 72.4 KiB
Document 1% · 42.6 KiB
CSS 1% · 26.5 KiB
Other 1% · 22.1 KiB

~133.8 KiB of savings available

Remove unused JavaScript: 133.8 KiB
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
JS Bundles
24 scripts, 134 KB unused
REVIEW
24 scripts, 134 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-4V7D...: 68 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TWP...: 65 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 134 KB
134 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-4V7DMTJFQH&cx=c&gtm=4e64k0h1172 KB68 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWP2FC7131 KB65 KB (50%)✓3rd
https://www.ucpress.edu/_next/static/chunks/7236-16e7f97c20c177c1.js5 KB—✓3rd
https://www.ucpress.edu/_next/static/chunks/app/%5Blang%5D/(frontend)/layout-56f49dd3e8cceea0.js8 KB—✓3rd
https://www.ucpress.edu/_next/static/chunks/main-app-5294d1645fe5526e.js1 KB—✓3rd
https://www.ucpress.edu/_next/static/chunks/2972-cf037e24685b7188.js9 KB—✓3rd
https://www.ucpress.edu/_next/static/chunks/12-441635ca8aaa2784.js18 KB—✓3rd
https://www.ucpress.edu/_next/static/chunks/8629-2178701f3c2d0682.js43 KB—✓3rd
https://www.ucpress.edu/_next/static/chunks/app/global-error-22c9857db83a9323.js6 KB—✓3rd
https://www.ucpress.edu/_next/static/chunks/3144-4c606c49359b8407.js4 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

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+
Image Optimization
23 images, 0 KB saveable
PASS
23 images, 0 KB saveable
Info::
All images are well-optimized
23 images 835 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (72 KB)
PASS
3 fonts (72 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

72 KB total

Render-blocking

0

of 3

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 7.0 s FCP 3.5 s LCP 6.9 shttps://www.ucpress.edu/_next/static/media/66ba2a843e21d3d3.p.woff266ba2a843e21d3d3.p.woff2 https://www.ucpress.edu/_next/static/media/66ba2a843e21d3d3.p.woff2 — 19.0 KiB — 458 ms — font-display: swaphttps://www.ucpress.edu/_next/static/media/904be59b21bd51cb.p.woff2904be59b21bd51cb.p.woff2 https://www.ucpress.edu/_next/static/media/904be59b21bd51cb.p.woff2 — 34.9 KiB — 455 ms — font-display: swaphttps://www.ucpress.edu/_next/static/media/dea9cd919d31e01f.p.woff2dea9cd919d31e01f.p.woff2 https://www.ucpress.edu/_next/static/media/dea9cd919d31e01f.p.woff2 — 18.6 KiB — 499 ms — font-display: swap
66ba2a843e21d3d3.p.woff2 woff2 swap
Size 19 KB
Load time 458 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
904be59b21bd51cb.p.woff2 woff2 swap
Size 35 KB
Load time 455 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
dea9cd919d31e01f.p.woff2 woff2 swap
Size 19 KB
Load time 499 ms
Start 1.1 s
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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
—
preload
5
dns-prefetch
—
prefetch
—

5 resource hints configured

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
74 requests over 14632ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 3.5 s LCP 6.9 shttps://ucpress.edu// https://ucpress.edu/ — 301 — 85 B — 524 ms — h2https://www.ucpress.edu/www.ucpress.edu/ https://www.ucpress.edu/ — 200 — 41.7 KiB — 877 ms — h2https://www.ucpress.edu/_next/static/media/66ba2a843e21d3d3.p.woff2www.ucpress.edu/_next/static/media/... https://www.ucpress.edu/_next/static/media/66ba2a843e21d3d3.p.woff2 — 200 — 19.0 KiB — 458 ms — h2https://www.ucpress.edu/_next/static/media/904be59b21bd51cb.p.woff2www.ucpress.edu/_next/static/media/... https://www.ucpress.edu/_next/static/media/904be59b21bd51cb.p.woff2 — 200 — 34.9 KiB — 455 ms — h2https://www.ucpress.edu/_next/static/media/dea9cd919d31e01f.p.woff2www.ucpress.edu/_next/static/media/... https://www.ucpress.edu/_next/static/media/dea9cd919d31e01f.p.woff2 — 200 — 18.6 KiB — 499 ms — h2https://www.ucpress.edu/_next/static/css/78720366cca2d000.csswww.ucpress.edu/_next/static/css/78... https://www.ucpress.edu/_next/static/css/78720366cca2d000.css — 200 — 7.0 KiB — 286 ms — h2https://www.ucpress.edu/_next/static/css/294ac286e084dc30.csswww.ucpress.edu/_next/static/css/29... https://www.ucpress.edu/_next/static/css/294ac286e084dc30.css — 200 — 4.0 KiB — 298 ms — h2https://www.ucpress.edu/_next/static/css/030a9d0cb98909ff.csswww.ucpress.edu/_next/static/css/03... https://www.ucpress.edu/_next/static/css/030a9d0cb98909ff.css — 200 — 954 B — 329 ms — h2https://www.ucpress.edu/_next/static/css/a4daba70e9c32d7d.csswww.ucpress.edu/_next/static/css/a4... https://www.ucpress.edu/_next/static/css/a4daba70e9c32d7d.css — 200 — 9.1 KiB — 329 ms — h2https://www.ucpress.edu/_next/static/css/d26cfd1c0122b5e6.csswww.ucpress.edu/_next/static/css/d2... https://www.ucpress.edu/_next/static/css/d26cfd1c0122b5e6.css — 200 — 1.4 KiB — 328 ms — h2https://www.ucpress.edu/_next/static/css/5409ca8d1befd620.csswww.ucpress.edu/_next/static/css/54... https://www.ucpress.edu/_next/static/css/5409ca8d1befd620.css — 200 — 1.6 KiB — 328 ms — h2https://www.ucpress.edu/_next/static/css/e779ab8d57497496.csswww.ucpress.edu/_next/static/css/e7... https://www.ucpress.edu/_next/static/css/e779ab8d57497496.css — 200 — 1002 B — 296 ms — h2https://www.ucpress.edu/_next/static/css/70363724b3929a5a.csswww.ucpress.edu/_next/static/css/70... https://www.ucpress.edu/_next/static/css/70363724b3929a5a.css — 200 — 899 B — 329 ms — h2https://www.ucpress.edu/_next/static/css/0e08852c6f8d5e76.csswww.ucpress.edu/_next/static/css/0e... https://www.ucpress.edu/_next/static/css/0e08852c6f8d5e76.css — 200 — 464 B — 327 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-TWP2FC7www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TWP2FC7 — 200 — 131.2 KiB — 154 ms — h2https://www.ucpress.edu/_next/static/chunks/webpack-8e7795f7f28069ed.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/webpack-8e7795f7f28069ed.js — 200 — 2.1 KiB — 499 ms — h2https://www.ucpress.edu/_next/static/chunks/fd9d1056-5bae34bee59f3468.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/fd9d1056-5bae34bee59f3468.js — 200 — 52.8 KiB — 671 ms — h2https://www.ucpress.edu/_next/static/chunks/2117-20652d18b489048f.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/2117-20652d18b489048f.js — 200 — 31.5 KiB — 669 ms — h2https://www.ucpress.edu/_next/static/chunks/main-app-5294d1645fe5526e.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/main-app-5294d1645fe5526e.js — 200 — 684 B — 495 ms — h2https://www.ucpress.edu/_next/static/chunks/2972-cf037e24685b7188.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/2972-cf037e24685b7188.js — 200 — 8.8 KiB — 665 ms — h2https://www.ucpress.edu/_next/static/chunks/12-441635ca8aaa2784.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/12-441635ca8aaa2784.js — 200 — 17.6 KiB — 665 ms — h2https://www.ucpress.edu/_next/static/chunks/8629-2178701f3c2d0682.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/8629-2178701f3c2d0682.js — 200 — 43.4 KiB — 670 ms — h2https://www.ucpress.edu/_next/static/chunks/app/global-error-22c9857db83a9323.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/app/global-error-22c9857db83a9323.js — 200 — 5.7 KiB — 663 ms — h2https://www.ucpress.edu/_next/static/chunks/3144-4c606c49359b8407.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/3144-4c606c49359b8407.js — 200 — 3.8 KiB — 663 ms — h2https://www.ucpress.edu/_next/static/chunks/8606-a3a9898d8aebf352.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/8606-a3a9898d8aebf352.js — 200 — 3.5 KiB — 663 ms — h2https://www.ucpress.edu/_next/static/chunks/9603-dcba721d09c4fa86.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/9603-dcba721d09c4fa86.js — 200 — 6.4 KiB — 662 ms — h2https://www.ucpress.edu/_next/static/chunks/7236-16e7f97c20c177c1.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/7236-16e7f97c20c177c1.js — 200 — 5.0 KiB — 662 ms — h2https://www.ucpress.edu/_next/static/chunks/app/%5Blang%5D/(frontend)/layout-56f49dd3e8cceea0.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/app/%5Blang%5D/(frontend)/layout-56f49dd3e8cceea0.js — 200 — 7.5 KiB — 662 ms — h2https://www.ucpress.edu/_next/static/chunks/app/%5Blang%5D/(frontend)/error-7b77f82649cc96f0.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/app/%5Blang%5D/(frontend)/error-7b77f82649cc96f0.js — 200 — 2.0 KiB — 662 ms — h2https://www.ucpress.edu/_next/static/chunks/5878-4bbcefb6af328f10.jswww.ucpress.edu/_next/static/chunks... https://www.ucpress.edu/_next/static/chunks/5878-4bbcefb6af328f10.js — 200 — 5.3 KiB — 663 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 3.5 s LCP 6.9 shttps://ucpress.edu// https://ucpress.edu/ — 301 — 85 B — 524 ms — h2https://www.ucpress.edu/www.ucpress.edu/ https://www.ucpress.edu/ — 200 — 41.7 KiB — 877 ms — h2https://www.ucpress.edu/_next/static/media/66ba2a843e21d3d3.p.woff2www.ucpress.edu/_next/static/media/... https://www.ucpress.edu/_next/static/media/66ba2a843e21d3d3.p.woff2 — 200 — 19.0 KiB — 458 ms — h2https://www.ucpress.edu/_next/static/media/904be59b21bd51cb.p.woff2www.ucpress.edu/_next/static/media/... https://www.ucpress.edu/_next/static/media/904be59b21bd51cb.p.woff2 — 200 — 34.9 KiB — 455 ms — h2https://www.ucpress.edu/_next/static/media/dea9cd919d31e01f.p.woff2www.ucpress.edu/_next/static/media/... https://www.ucpress.edu/_next/static/media/dea9cd919d31e01f.p.woff2 — 200 — 18.6 KiB — 499 ms — h2https://www.ucpress.edu/_next/static/css/78720366cca2d000.csswww.ucpress.edu/_next/static/css/78... https://www.ucpress.edu/_next/static/css/78720366cca2d000.css — 200 — 7.0 KiB — 286 ms — h2https://www.ucpress.edu/_next/static/css/294ac286e084dc30.csswww.ucpress.edu/_next/static/css/29... https://www.ucpress.edu/_next/static/css/294ac286e084dc30.css — 200 — 4.0 KiB — 298 ms — h2https://www.ucpress.edu/_next/static/css/030a9d0cb98909ff.csswww.ucpress.edu/_next/static/css/03... https://www.ucpress.edu/_next/static/css/030a9d0cb98909ff.css — 200 — 954 B — 329 ms — h2https://www.ucpress.edu/_next/static/css/a4daba70e9c32d7d.csswww.ucpress.edu/_next/static/css/a4... https://www.ucpress.edu/_next/static/css/a4daba70e9c32d7d.css — 200 — 9.1 KiB — 329 ms — h2https://www.ucpress.edu/_next/static/css/d26cfd1c0122b5e6.csswww.ucpress.edu/_next/static/css/d2... https://www.ucpress.edu/_next/static/css/d26cfd1c0122b5e6.css — 200 — 1.4 KiB — 328 ms — h2https://www.ucpress.edu/_next/static/css/5409ca8d1befd620.csswww.ucpress.edu/_next/static/css/54... 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h2https://region1.google-analytics.com/g/collect?v=2&tid=G-4V7DMTJFQH&gtm=45je64k0h1v889074104z879909112za20gzb79909112zd79909112&_p=1776891261962&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=69592755.1776891267&frm=0&pscdl=noapi&rcb=3&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266401~117512542~117884344~118463262&sid=1776891267&sct=1&seg=0&dl=https%3A%2F%2Fwww.ucpress.edu%2F&dt=University%20of%20California%20Press&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=7147region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-4V7DMTJFQH&gtm=45je64k0h1v889074104z879909112za20gzb79909112zd79909112&_p=1776891261962&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=69592755.1776891267&frm=0&pscdl=noapi&rcb=3&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266401~117512542~117884344~118463262&sid=1776891267&sct=1&seg=0&dl=https%3A%2F%2Fwww.ucpress.edu%2F&dt=University%20of%20California%20Press&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=7147 — 204 — 549 B — 90 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=2056353794&t=pageview&_s=1&dl=https%3A%2F%2Fwww.ucpress.edu%2F&ul=en-us&dt=University%20of%20California%20Press&sr=412x823&vp=412x823&_u=YADAAEABAAAAACAAI~&jid=2102406662&gjid=2026654475&cid=69592755.1776891267&tid=UA-30317-1&_gid=2065984384.1776891267&_r=1&_slc=1&gtm=45He64k0h1n81TWP2FC7v79909112za200zd79909112&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266401~118463262&npa=1&z=1763896671www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=2056353794&t=pageview&_s=1&dl=https%3A%2F%2Fwww.ucpress.edu%2F&ul=en-us&dt=University%20of%20California%20Press&sr=412x823&vp=412x823&_u=YADAAEABAAAAACAAI~&jid=2102406662&gjid=2026654475&cid=69592755.1776891267&tid=UA-30317-1&_gid=2065984384.1776891267&_r=1&_slc=1&gtm=45He64k0h1n81TWP2FC7v79909112za200zd79909112&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266401~118463262&npa=1&z=1763896671 — 200 — 452 B — 25 ms — h2https://www.ucpress.edu/favicon.icowww.ucpress.edu/favicon.ico https://www.ucpress.edu/favicon.ico — 200 — 914 B — 1.3 s — h2
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 2971ms · 505KB · €16/mo
www.ucpress.edu
Other
Costly
Execution 871ms
Transfer 42 KB
Monthly Cost €5/mo
Unattributable
Other
Costly
Execution 571ms
Transfer 0 KB
Monthly Cost €3/mo
www.ucpress.edu
Other
Costly
Execution 492ms
Transfer 32 KB
Monthly Cost €3/mo
www.ucpress.edu
Other
Costly
Execution 369ms
Transfer 43 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 196ms
Transfer 172 KB
Unused 40%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 175ms
Transfer 131 KB
Unused 50%
Monthly Cost €1/mo
www.ucpress.edu
Other
Optional
Execution 155ms
Transfer 53 KB
Monthly Cost €1/mo
www.ucpress.edu
Other
Optional
Execution 88ms
Transfer 11 KB
Monthly Cost €0/mo
Google Analytics
Analytics
Optional
Execution 53ms
Transfer 21 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • www.ucpress.edu adds 871ms and costs ~€5/month
  • Unattributable adds 571ms and costs ~€3/month
  • www.ucpress.edu adds 492ms and costs ~€3/month
  • www.ucpress.edu adds 369ms and costs ~€2/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

www.ucpress.edu takes 871ms 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 571ms 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

www.ucpress.edu takes 492ms 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

www.ucpress.edu takes 369ms 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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