Skip to content
https://wisc.edu

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
85
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
100
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.

1.31 s

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

2.10 s

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

18 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.

1.45 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.

2.56 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 2 REVIEW 5 FIX
F
Page Weight Budget
Action
4.5 MB transferred, 42 requests
FIX
4.5 MB transferred, 42 requests
Critical::
Page weighs 6.0 MB (4.5 MB transferred)
Warning::
Images are 3.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.6 MB
Warning::
JavaScript is 724 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 724 KB
Info::
42 HTTP requests
Info::
Estimated 0.94 g CO2 per page load
4.5 MB / 2.4 MB budget
4.5 MB transferred
42 requests
0.94 g CO2 per page load
Images 3.6 MiB 80%
JavaScript 724.3 KiB 16%
Fonts 121.5 KiB 3%
CSS 24.4 KiB 1%
HTML 23.1 KiB 1%
Other 6.7 KiB 0%
Other 695 B 0%
Other 595 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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 (4.5 MiB of 4.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
9 scripts, 362 KB unused
FIX
9 scripts, 362 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-D04H...: 108 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TQ8...: 66 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-D04H...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N7G...: 62 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-PLJ9...: 62 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 362 KB
362 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-D04HXCEERG&cx=c&gtm=4e64h1h1154 KB108 KB (70%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TQ8DQJ4119 KB66 KB (55%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-D04HXCEERG154 KB64 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N7GFX62125 KB62 KB (50%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-PLJ9E3ZY82&cx=c&gtm=4e64h1h1156 KB62 KB (40%)✓3rd
https://www.wisc.edu/js/redesign.b2edc13edf9eef87d18f54f90b3fb8eb.js3 KB—✓3rd
https://www.wisc.edu/js/uw-alerts.5f2d80a5abd5857da8ff06a623e147eb.js4 KB—✓3rd
https://cdn.wisc.cloud/cookie-consent/1.1.0/uwcookieconsent.min.js3 KB—✓3rd
https://img04.en25.com/i/elqCfg.min.js6 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

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
42 resources · 4.5 MB · 362 KB savings available
FIX
42 resources · 4.5 MB · 362 KB savings available
Warning::
Page weight 3.5 MB over 1MB target
Got: 4.5 MB Expected: ≤ 1 MB
Info::
~362 KB of savings available
Warning::
41 third-party resources (100% of weight)
Info::
8 resources over 200KB
42 resources · 4.5 MiB · 41 third-party 3.5 MiB over 1MB target
Image 81% · 3.6 MiB
JavaScript 16% · 724.3 KiB
Font 3% · 121.5 KiB
CSS 1% · 24.4 KiB
Document 1% · 24.2 KiB
Other 0% · 1.3 KiB

~362.0 KiB of savings available

Remove unused JavaScript: 362.0 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
Image Optimization
17 images, 0 KB saveable
REVIEW
17 images, 0 KB saveable
Info::
All images are well-optimized
17 images 3.6 MB
0 oversized -0 KB
16 legacy format
0 missing dimensions CLS risk
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+
JS Execution Cost
483ms total JS execution
PASS
483ms total JS execution
Warning::
https://www.wisc.edu/: 252ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-PLJ9...: 91ms CPU time
Info::
Unattributable: 75ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-D04H...: 65ms CPU time
Warning::
Third-party scripts: 483ms (100% of total)

Main Thread Breakdown

Script Evaluation 36% Other 27% Style & Layout 23% Script Parsing & Compilation 9% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.wisc.edu/252ms6ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-PLJ9E3ZY82&cx=c&gtm=4e64h1h191ms78ms12ms3rd
Unattributable75ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-D04HXCEERG65ms53ms12ms3rd
A+
Font Loading
5 fonts (122 KB)
PASS
5 fonts (122 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

122 KB total

Render-blocking

0

of 5

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 1.3 s LCP 2.1 shttps://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-text-latin.v13.woff2redhat-text-latin.v13.w... https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-text-latin.v13.woff2 — 27.6 KiB — 39 ms — font-display: swaphttps://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-display-latin.v14.woff2redhat-display-latin.v1... https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-display-latin.v14.woff2 — 28.6 KiB — 27 ms — font-display: swaphttps://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-text-italic-latin.v13.woff2redhat-text-italic-lati... https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-text-italic-latin.v13.woff2 — 29.9 KiB — 47 ms — font-display: swaphttps://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/libre-baskerville-700-latin.v14.woff2libre-baskerville-700-l... https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/libre-baskerville-700-latin.v14.woff2 — 17.9 KiB — 40 ms — font-display: swaphttps://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/libre-baskerville-400-latin.v14.woff2libre-baskerville-400-l... https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/libre-baskerville-400-latin.v14.woff2 — 17.4 KiB — 49 ms — font-display: swap
redhat-text-latin.v13.w... woff2 swap
Size 28 KB
Load time 39 ms
Start 807 ms
Risk FOUT — text flashes from fallback to web font
redhat-display-latin.v1... woff2 swap
Size 29 KB
Load time 27 ms
Start 807 ms
Risk FOUT — text flashes from fallback to web font
redhat-text-italic-lati... woff2 swap
Size 30 KB
Load time 47 ms
Start 807 ms
Risk FOUT — text flashes from fallback to web font
libre-baskerville-700-l... woff2 swap
Size 18 KB
Load time 40 ms
Start 807 ms
Risk FOUT — text flashes from fallback to web font
libre-baskerville-400-l... woff2 swap
Size 17 KB
Load time 49 ms
Start 808 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
42 requests over 1824ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 2.1 shttps://wisc.edu// https://wisc.edu/ — 301 — 234 B — 375 ms — http/1.1https://www.wisc.edu/www.wisc.edu/ https://www.wisc.edu/ — 200 — 23.1 KiB — 221 ms — h2https://www.wisc.edu/images/hero/bascom-hill-spring-2025-1600.jpgwww.wisc.edu/images/hero/bascom-hil... https://www.wisc.edu/images/hero/bascom-hill-spring-2025-1600.jpg — 200 — 350.3 KiB — 80 ms — h2https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/fonts.csscdn.wisc.cloud/fonts/uw-rh-lb/0.0.1... https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/fonts.css — 200 — 891 B — 69 ms — h2https://www.wisc.edu/css/redesign.35588a9a443ae153e14a44a88430175b.csswww.wisc.edu/css/redesign.35588a9a4... https://www.wisc.edu/css/redesign.35588a9a443ae153e14a44a88430175b.css — 200 — 21.2 KiB — 85 ms — h2https://www.wisc.edu/css/uw_alerts.52f6ec0c5077e42907ca966bb4252b1e.csswww.wisc.edu/css/uw_alerts.52f6ec0c... https://www.wisc.edu/css/uw_alerts.52f6ec0c5077e42907ca966bb4252b1e.css — 200 — 826 B — 80 ms — h2https://www.wisc.edu/js/redesign.b2edc13edf9eef87d18f54f90b3fb8eb.jswww.wisc.edu/js/redesign.b2edc13edf... https://www.wisc.edu/js/redesign.b2edc13edf9eef87d18f54f90b3fb8eb.js — 200 — 3.3 KiB — 80 ms — h2https://www.wisc.edu/js/uw-alerts.5f2d80a5abd5857da8ff06a623e147eb.jswww.wisc.edu/js/uw-alerts.5f2d80a5a... https://www.wisc.edu/js/uw-alerts.5f2d80a5abd5857da8ff06a623e147eb.js — 200 — 4.1 KiB — 82 ms — h2https://cdn.wisc.cloud/cookie-consent/1.1.0/uwcookieconsent.min.jscdn.wisc.cloud/cookie-consent/1.1.0... https://cdn.wisc.cloud/cookie-consent/1.1.0/uwcookieconsent.min.js — 200 — 3.3 KiB — 56 ms — h2https://www.googletagmanager.com/gtag/js?id=G-D04HXCEERGwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-D04HXCEERG — 200 — 153.6 KiB — 182 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-N7GFX62www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-N7GFX62 — 200 — 124.5 KiB — 138 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-TQ8DQJ4www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TQ8DQJ4 — 200 — 119.3 KiB — 161 ms — h2https://www.wisc.edu/css/print.85b35cb7d814b15abbc88d55dcda53c8.csswww.wisc.edu/css/print.85b35cb7d814... https://www.wisc.edu/css/print.85b35cb7d814b15abbc88d55dcda53c8.css — 200 — 1.6 KiB — 20 ms — h2https://www.wisc.edu/images/home/terrace-chairs-rainbow.jpgwww.wisc.edu/images/home/terrace-ch... https://www.wisc.edu/images/home/terrace-chairs-rainbow.jpg — 200 — 484.7 KiB — 45 ms — h2https://www.wisc.edu/images/quote-mark-red.svgwww.wisc.edu/images/quote-mark-red.... https://www.wisc.edu/images/quote-mark-red.svg — 200 — 1.1 KiB — 21 ms — h2https://www.wisc.edu/images/admissions/capitol-rainbow-1600x940.jpgwww.wisc.edu/images/admissions/capi... https://www.wisc.edu/images/admissions/capitol-rainbow-1600x940.jpg — 200 — 237.6 KiB — 36 ms — h2https://www.wisc.edu/images/geometric-bg-2.svgwww.wisc.edu/images/geometric-bg-2.... https://www.wisc.edu/images/geometric-bg-2.svg — 200 — 2.5 KiB — 37 ms — h2https://www.wisc.edu/images/news/AuthorPhoto_JP-credit-to-Emilio-Guede-Jr_-900x600.jpgwww.wisc.edu/images/news/AuthorPhot... https://www.wisc.edu/images/news/AuthorPhoto_JP-credit-to-Emilio-Guede-Jr_-900x600.jpg — 200 — 96.3 KiB — 34 ms — h2https://www.wisc.edu/images/news/2026-27-Go-Big-Read-4x3-1-608x456.jpgwww.wisc.edu/images/news/2026-27-Go... https://www.wisc.edu/images/news/2026-27-Go-Big-Read-4x3-1-608x456.jpg — 200 — 77.1 KiB — 87 ms — h2https://www.wisc.edu/images/news/block-by-block-county-map-608x456.jpgwww.wisc.edu/images/news/block-by-b... https://www.wisc.edu/images/news/block-by-block-county-map-608x456.jpg — 200 — 97.9 KiB — 36 ms — h2https://www.wisc.edu/images/news/Fall-Campus-2025-10-29TW-4021_4x3-608x456.jpgwww.wisc.edu/images/news/Fall-Campu... https://www.wisc.edu/images/news/Fall-Campus-2025-10-29TW-4021_4x3-608x456.jpg — 200 — 116.2 KiB — 43 ms — h2https://www.wisc.edu/images/news/Northern-Lights-2025-11-12TW-1041-1882x1411-1-608x456.jpgwww.wisc.edu/images/news/Northern-L... https://www.wisc.edu/images/news/Northern-Lights-2025-11-12TW-1041-1882x1411-1-608x456.jpg — 200 — 85.1 KiB — 86 ms — h2https://www.wisc.edu/images/home/salt2.webpwww.wisc.edu/images/home/salt2.webp https://www.wisc.edu/images/home/salt2.webp — 200 — 527.6 KiB — 93 ms — h2https://www.wisc.edu/images/home/discovering-stem-cells.jpgwww.wisc.edu/images/home/discoverin... https://www.wisc.edu/images/home/discovering-stem-cells.jpg — 200 — 392.2 KiB — 93 ms — h2https://www.wisc.edu/images/home/south-africa-prairie.jpgwww.wisc.edu/images/home/south-afri... https://www.wisc.edu/images/home/south-africa-prairie.jpg — 200 — 552.4 KiB — 87 ms — h2https://www.wisc.edu/images/home/dom-strings-blue-sky.jpgwww.wisc.edu/images/home/dom-string... https://www.wisc.edu/images/home/dom-strings-blue-sky.jpg — 200 — 221.2 KiB — 68 ms — h2https://www.wisc.edu/images/home/yellowstone-sunset.jpgwww.wisc.edu/images/home/yellowston... https://www.wisc.edu/images/home/yellowstone-sunset.jpg — 200 — 392.7 KiB — 93 ms — h2https://www.wisc.edu/images/home/smp-mural22.jpg?1www.wisc.edu/images/home/smp-mural2... https://www.wisc.edu/images/home/smp-mural22.jpg?1 — 200 — 70.7 KiB — 82 ms — h2https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-text-latin.v13.woff2cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1... https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-text-latin.v13.woff2 — 200 — 27.6 KiB — 39 ms — h2https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-display-latin.v14.woff2cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1... https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-display-latin.v14.woff2 — 200 — 28.6 KiB — 27 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 2.1 shttps://wisc.edu// https://wisc.edu/ — 301 — 234 B — 375 ms — http/1.1https://www.wisc.edu/www.wisc.edu/ https://www.wisc.edu/ — 200 — 23.1 KiB — 221 ms — h2https://www.wisc.edu/images/hero/bascom-hill-spring-2025-1600.jpgwww.wisc.edu/images/hero/bascom-hil... https://www.wisc.edu/images/hero/bascom-hill-spring-2025-1600.jpg — 200 — 350.3 KiB — 80 ms — h2https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/fonts.csscdn.wisc.cloud/fonts/uw-rh-lb/0.0.1... https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/fonts.css — 200 — 891 B — 69 ms — h2https://www.wisc.edu/css/redesign.35588a9a443ae153e14a44a88430175b.csswww.wisc.edu/css/redesign.35588a9a4... https://www.wisc.edu/css/redesign.35588a9a443ae153e14a44a88430175b.css — 200 — 21.2 KiB — 85 ms — h2https://www.wisc.edu/css/uw_alerts.52f6ec0c5077e42907ca966bb4252b1e.csswww.wisc.edu/css/uw_alerts.52f6ec0c... https://www.wisc.edu/css/uw_alerts.52f6ec0c5077e42907ca966bb4252b1e.css — 200 — 826 B — 80 ms — h2https://www.wisc.edu/js/redesign.b2edc13edf9eef87d18f54f90b3fb8eb.jswww.wisc.edu/js/redesign.b2edc13edf... https://www.wisc.edu/js/redesign.b2edc13edf9eef87d18f54f90b3fb8eb.js — 200 — 3.3 KiB — 80 ms — h2https://www.wisc.edu/js/uw-alerts.5f2d80a5abd5857da8ff06a623e147eb.jswww.wisc.edu/js/uw-alerts.5f2d80a5a... https://www.wisc.edu/js/uw-alerts.5f2d80a5abd5857da8ff06a623e147eb.js — 200 — 4.1 KiB — 82 ms — h2https://cdn.wisc.cloud/cookie-consent/1.1.0/uwcookieconsent.min.jscdn.wisc.cloud/cookie-consent/1.1.0... https://cdn.wisc.cloud/cookie-consent/1.1.0/uwcookieconsent.min.js — 200 — 3.3 KiB — 56 ms — h2https://www.googletagmanager.com/gtag/js?id=G-D04HXCEERGwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-D04HXCEERG — 200 — 153.6 KiB — 182 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-N7GFX62www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-N7GFX62 — 200 — 124.5 KiB — 138 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-TQ8DQJ4www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TQ8DQJ4 — 200 — 119.3 KiB — 161 ms — h2https://www.wisc.edu/css/print.85b35cb7d814b15abbc88d55dcda53c8.csswww.wisc.edu/css/print.85b35cb7d814... https://www.wisc.edu/css/print.85b35cb7d814b15abbc88d55dcda53c8.css — 200 — 1.6 KiB — 20 ms — h2https://www.wisc.edu/images/home/terrace-chairs-rainbow.jpgwww.wisc.edu/images/home/terrace-ch... https://www.wisc.edu/images/home/terrace-chairs-rainbow.jpg — 200 — 484.7 KiB — 45 ms — h2https://www.wisc.edu/images/quote-mark-red.svgwww.wisc.edu/images/quote-mark-red.... https://www.wisc.edu/images/quote-mark-red.svg — 200 — 1.1 KiB — 21 ms — h2https://www.wisc.edu/images/admissions/capitol-rainbow-1600x940.jpgwww.wisc.edu/images/admissions/capi... https://www.wisc.edu/images/admissions/capitol-rainbow-1600x940.jpg — 200 — 237.6 KiB — 36 ms — h2https://www.wisc.edu/images/geometric-bg-2.svgwww.wisc.edu/images/geometric-bg-2.... https://www.wisc.edu/images/geometric-bg-2.svg — 200 — 2.5 KiB — 37 ms — h2https://www.wisc.edu/images/news/AuthorPhoto_JP-credit-to-Emilio-Guede-Jr_-900x600.jpgwww.wisc.edu/images/news/AuthorPhot... https://www.wisc.edu/images/news/AuthorPhoto_JP-credit-to-Emilio-Guede-Jr_-900x600.jpg — 200 — 96.3 KiB — 34 ms — h2https://www.wisc.edu/images/news/2026-27-Go-Big-Read-4x3-1-608x456.jpgwww.wisc.edu/images/news/2026-27-Go... https://www.wisc.edu/images/news/2026-27-Go-Big-Read-4x3-1-608x456.jpg — 200 — 77.1 KiB — 87 ms — h2https://www.wisc.edu/images/news/block-by-block-county-map-608x456.jpgwww.wisc.edu/images/news/block-by-b... https://www.wisc.edu/images/news/block-by-block-county-map-608x456.jpg — 200 — 97.9 KiB — 36 ms — h2https://www.wisc.edu/images/news/Fall-Campus-2025-10-29TW-4021_4x3-608x456.jpgwww.wisc.edu/images/news/Fall-Campu... https://www.wisc.edu/images/news/Fall-Campus-2025-10-29TW-4021_4x3-608x456.jpg — 200 — 116.2 KiB — 43 ms — h2https://www.wisc.edu/images/news/Northern-Lights-2025-11-12TW-1041-1882x1411-1-608x456.jpgwww.wisc.edu/images/news/Northern-L... https://www.wisc.edu/images/news/Northern-Lights-2025-11-12TW-1041-1882x1411-1-608x456.jpg — 200 — 85.1 KiB — 86 ms — h2https://www.wisc.edu/images/home/salt2.webpwww.wisc.edu/images/home/salt2.webp https://www.wisc.edu/images/home/salt2.webp — 200 — 527.6 KiB — 93 ms — h2https://www.wisc.edu/images/home/discovering-stem-cells.jpgwww.wisc.edu/images/home/discoverin... https://www.wisc.edu/images/home/discovering-stem-cells.jpg — 200 — 392.2 KiB — 93 ms — h2https://www.wisc.edu/images/home/south-africa-prairie.jpgwww.wisc.edu/images/home/south-afri... https://www.wisc.edu/images/home/south-africa-prairie.jpg — 200 — 552.4 KiB — 87 ms — h2https://www.wisc.edu/images/home/dom-strings-blue-sky.jpgwww.wisc.edu/images/home/dom-string... https://www.wisc.edu/images/home/dom-strings-blue-sky.jpg — 200 — 221.2 KiB — 68 ms — h2https://www.wisc.edu/images/home/yellowstone-sunset.jpgwww.wisc.edu/images/home/yellowston... https://www.wisc.edu/images/home/yellowstone-sunset.jpg — 200 — 392.7 KiB — 93 ms — h2https://www.wisc.edu/images/home/smp-mural22.jpg?1www.wisc.edu/images/home/smp-mural2... https://www.wisc.edu/images/home/smp-mural22.jpg?1 — 200 — 70.7 KiB — 82 ms — h2https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-text-latin.v13.woff2cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1... https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-text-latin.v13.woff2 — 200 — 27.6 KiB — 39 ms — h2https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-display-latin.v14.woff2cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1... https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-display-latin.v14.woff2 — 200 — 28.6 KiB — 27 ms — h2https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-text-italic-latin.v13.woff2cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1... https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-text-italic-latin.v13.woff2 — 200 — 29.9 KiB — 47 ms — h2https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/libre-baskerville-700-latin.v14.woff2cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1... https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/libre-baskerville-700-latin.v14.woff2 — 200 — 17.9 KiB — 40 ms — h2https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/libre-baskerville-400-latin.v14.woff2cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1... https://cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/libre-baskerville-400-latin.v14.woff2 — 200 — 17.4 KiB — 49 ms — h2https://alerts.wisc.edu/syndicated.json?1776797945816alerts.wisc.edu/syndicated.json?177... https://alerts.wisc.edu/syndicated.json?1776797945816 — 200 — 695 B — 358 ms — h2https://img04.en25.com/i/elqCfg.min.jsimg04.en25.com/i/elqCfg.min.js https://img04.en25.com/i/elqCfg.min.js — 200 — 6.4 KiB — 22 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-PLJ9E3ZY82&cx=c&gtm=4e64h1h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-PLJ9E3ZY82&cx=c&gtm=4e64h1h1 — 200 — 156.1 KiB — 50 ms — h2https://www.googletagmanager.com/gtag/js?id=G-D04HXCEERG&cx=c&gtm=4e64h1h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-D04HXCEERG&cx=c&gtm=4e64h1h1 — 200 — 153.6 KiB — 42 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-D04HXCEERG&gtm=45je64h1h1v882050636za200zb894059498zd894059498&_p=1776797945544&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1033970702.1776797946&frm=0&pscdl=noapi&rcb=8&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401~117384406~118463262&sid=1776797945&sct=1&seg=0&dl=https%3A%2F%2Fwww.wisc.edu%2F&dt=University%20of%20Wisconsin%E2%80%93Madison&_tu=QA&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=1066region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-D04HXCEERG&gtm=45je64h1h1v882050636za200zb894059498zd894059498&_p=1776797945544&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1033970702.1776797946&frm=0&pscdl=noapi&rcb=8&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401~117384406~118463262&sid=1776797945&sct=1&seg=0&dl=https%3A%2F%2Fwww.wisc.edu%2F&dt=University%20of%20Wisconsin%E2%80%93Madison&_tu=QA&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=1066 — 204 — 547 B — 123 ms — h2https://s1427524768.t.eloqua.com/visitor/v200/svrGP?pps=3&siteid=1427524768&ref2=elqNone&tzo=0&ms=4&optin=disableds1427524768.t.eloqua.com/visitor/v2... https://s1427524768.t.eloqua.com/visitor/v200/svrGP?pps=3&siteid=1427524768&ref2=elqNone&tzo=0&ms=4&optin=disabled — 302 — 823 B — 298 ms — http/1.1https://region1.google-analytics.com/g/collect?v=2&tid=G-PLJ9E3ZY82&gtm=45je64h1h1v894063859z8894059498za20gzb894059498zd894059498&_p=1776797945544&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=Ag&are=1&cid=1033970702.1776797946&frm=0&pscdl=noapi&rcb=15&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938465~115938468~117266400&sid=1776797946&sct=1&seg=0&dl=https%3A%2F%2Fwww.wisc.edu%2F&dt=University%20of%20Wisconsin%E2%80%93Madison&en=page_view&_fv=1&_ss=1&tfd=1175region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-PLJ9E3ZY82&gtm=45je64h1h1v894063859z8894059498za20gzb894059498zd894059498&_p=1776797945544&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=Ag&are=1&cid=1033970702.1776797946&frm=0&pscdl=noapi&rcb=15&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938465~115938468~117266400&sid=1776797946&sct=1&seg=0&dl=https%3A%2F%2Fwww.wisc.edu%2F&dt=University%20of%20Wisconsin%E2%80%93Madison&en=page_view&_fv=1&_ss=1&tfd=1175 — 204 — 48 B — 26 ms — h2https://s1427524768.t.eloqua.com/visitor/v200/svrGP.aspx?pps=3&siteid=1427524768&ref2=elqNone&tzo=0&ms=4&optin=disabled&elqCookie=1s1427524768.t.eloqua.com/visitor/v2... https://s1427524768.t.eloqua.com/visitor/v200/svrGP.aspx?pps=3&siteid=1427524768&ref2=elqNone&tzo=0&ms=4&optin=disabled&elqCookie=1 — 200 — 448 B — 103 ms — http/1.1https://www.wisc.edu/favicon.icowww.wisc.edu/favicon.ico https://www.wisc.edu/favicon.ico — 200 — 5.7 KiB — 338 ms — 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 483ms · 333KB · $6/mo
www.wisc.edu
Other
Costly
Execution 252ms
Transfer 23 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 91ms
Transfer 156 KB
Unused 40%
Monthly Cost $1/mo
Unattributable
Other
Optional
Execution 75ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 65ms
Transfer 154 KB
Unused 41%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.wisc.edu adds 252ms and costs ~$3/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.wisc.edu takes 252ms 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.

Send Feedback