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https://uchicago.edu

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
56
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
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.

1.01 s

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

2.95 s

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

25 ms

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

0.578

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

2.02 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.

3.44 s

Page Load Progression

583 ms
1.2 s
1.7 s
2.3 s
2.9 s
3.5 s
4.1 s
4.7 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
12.8 MB transferred, 100 requests
FIX
12.8 MB transferred, 100 requests
Critical::
Page weighs 16.2 MB (12.8 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
Fonts are 1.0 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.0 MB
Info::
100 HTTP requests
Info::
Estimated 2.7 g CO2 per page load
12.8 MB / 2.4 MB budget
12.8 MB transferred
100 requests
2.7 g CO2 per page load
Other 10.1 MiB 79%
JavaScript 1.1 MiB 9%
Fonts 1.0 MiB 8%
Images 296.9 KiB 2%
Other 96.2 KiB 1%
CSS 43.5 KiB 0%
HTML 33.5 KiB 0%
Other 25.9 KiB 0%
Other 15.2 KiB 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (12.8 MiB of 12.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
42 scripts, 545 KB unused
FIX
42 scripts, 545 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2V4M...: 110 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uchicago.edu/dist/intranet/static/js/1...: 110 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://siteimproveanalytics.com/js/siteanalyze_66...: 73 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2V4M...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DBDW...: 65 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 545 KB
545 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-2V4M4Z833J&cx=c&gtm=4e64h1156 KB110 KB (71%)✓3rd
https://www.uchicago.edu/dist/intranet/static/js/188.d88c0093.chunk.js196 KB110 KB (56%)✓3rd
https://siteimproveanalytics.com/js/siteanalyze_66356295.js89 KB73 KB (82%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-2V4M4Z833J156 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-DBDWJCS0JR&cx=c&_slc=1148 KB65 KB (44%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NCZDFHH124 KB63 KB (51%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓3rd
https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/js/bootstrap.bundle.min.js24 KB20 KB (86%)✓3rd
https://www.uchicago.edu/dist/intranet/static/js/Footer.85a22dba.chunk.js3 KB—✓3rd
https://www.uchicago.edu/dist/intranet/static/js/CalendarEmbed.0f6e9f46.chunk.js2 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

F
Page Weight Inventory
Action
100 resources · 12.8 MB · 545 KB savings available
FIX
100 resources · 12.8 MB · 545 KB savings available
Warning::
Page weight 11.8 MB over 1MB target
Got: 12.8 MB Expected: ≤ 1 MB
Info::
~545 KB of savings available
Warning::
99 third-party resources (100% of weight)
Info::
1 resources over 200KB
100 resources · 12.8 MiB · 99 third-party 11.8 MiB over 1MB target
Media 79% · 10.1 MiB
JavaScript 9% · 1.1 MiB
Font 8% · 1.0 MiB
Image 2% · 311.9 KiB
CSS 1% · 137.4 KiB
Document 0% · 33.7 KiB
Other 0% · 28.3 KiB

~544.6 KiB of savings available

Remove unused JavaScript: 544.6 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.

C
Image Optimization
Action
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://www.uchicago.edu/-/media/project/uchicago-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uchicago.edu/-/media/project/uchicago-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uchicago.edu/-/media/project/uchicago-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uchicago.edu/-/media/images/logo-backg... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uchicago.edu/-/media/project/uchicago-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 297 KB
0 oversized -0 KB
11 legacy format
5 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

C
JS Execution Cost
Action
1053ms total JS execution
REVIEW
1053ms total JS execution
Warning::
Unattributable: 298ms CPU time
Info::
https://www.uchicago.edu/: 242ms CPU time
Info::
https://www.uchicago.edu/dist/intranet/static/js/1...: 237ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-2V4M...: 88ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-DBDW...: 69ms CPU time
Warning::
Third-party scripts: 1053ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Other 26% Style & Layout 14% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
Unattributable298ms7ms0ms3rd
https://www.uchicago.edu/242ms4ms1ms3rd
https://www.uchicago.edu/dist/intranet/static/js/188.d88c0093.chunk.js237ms161ms25ms3rd
https://www.googletagmanager.com/gtag/js?id=G-2V4M4Z833J88ms69ms18ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DBDWJCS0JR&cx=c&_slc=169ms55ms13ms3rd
https://www.uchicago.edu/dist/intranet/static/js/main.8c2186e0.chunk.js60ms58ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NCZDFHH59ms47ms11ms3rd
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
12 fonts (1034 KB)
PASS
12 fonts (1034 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

1034 KB total

Render-blocking

0

of 12

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 FCP 1.0 s LCP 3.0 shttps://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/fonts/uchicago-sans-serif/UChicagoSansSerif-Regular.woff2UChicagoSansSerif-Regul... https://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/fonts/uchicago-sans-serif/UChicagoSansSerif-Regular.woff2 — 143.9 KiB — 134 ms — font-display: swaphttps://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/fonts/uchicago-sans-serif/UChicagoSansSerif-SemiBold.woff2UChicagoSansSerif-SemiB... https://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/fonts/uchicago-sans-serif/UChicagoSansSerif-SemiBold.woff2 — 142.9 KiB — 141 ms — font-display: swaphttps://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/fonts/uchicago-sans-serif/UChicagoSansSerif-RegularItalic.woff2UChicagoSansSerif-Regul... https://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/fonts/uchicago-sans-serif/UChicagoSansSerif-RegularItalic.woff2 — 144.5 KiB — 136 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-13.woff2pro-fa-regular-400-13.w... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-13.woff2 — 15.4 KiB — 57 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-12.woff2pro-fa-regular-400-12.w... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-12.woff2 — 18.8 KiB — 50 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-0.woff2pro-fa-brands-400-0.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-0.woff2 — 36.9 KiB — 57 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-12.woff2pro-fa-solid-900-12.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-12.woff2 — 16.2 KiB — 46 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-1.woff2pro-fa-brands-400-1.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-1.woff2 — 39.6 KiB — 37 ms — font-display: swaphttps://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/fonts/uchicago-serif/UChicagoSerif-Regular.woff2UChicagoSerif-Regular.w... https://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/fonts/uchicago-serif/UChicagoSerif-Regular.woff2 — 146.1 KiB — 60 ms — font-display: swaphttps://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/fonts/uchicago-serif/UChicagoSerif-SemiBold.woff2UChicagoSerif-SemiBold.... https://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/fonts/uchicago-serif/UChicagoSerif-SemiBold.woff2 — 166.7 KiB — 75 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-0.woff2pro-fa-regular-400-0.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-0.woff2 — 14.3 KiB — 42 ms — font-display: swaphttps://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/fonts/uchicago-sans-serif/UChicagoSansSerif-Bold.woff2UChicagoSansSerif-Bold.... https://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/fonts/uchicago-sans-serif/UChicagoSansSerif-Bold.woff2 — 148.2 KiB — 55 ms — font-display: swap
UChicagoSansSerif-Regul... woff2 swap
Size 144 KB
Load time 134 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
UChicagoSansSerif-SemiB... woff2 swap
Size 143 KB
Load time 141 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
UChicagoSansSerif-Regul... woff2 swap
Size 144 KB
Load time 136 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
pro-fa-regular-400-13.w... woff2 swap
Size 15 KB
Load time 57 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-12.w... woff2 swap
Size 19 KB
Load time 50 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-0.woff2 woff2 swap
Size 37 KB
Load time 57 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-12.woff2 woff2 swap
Size 16 KB
Load time 46 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-1.woff2 woff2 swap
Size 40 KB
Load time 37 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
UChicagoSerif-Regular.w... woff2 swap
Size 146 KB
Load time 60 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
UChicagoSerif-SemiBold.... woff2 swap
Size 167 KB
Load time 75 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
pro-fa-regular-400-0.woff2 woff2 swap
Size 14 KB
Load time 42 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
UChicagoSansSerif-Bold.... woff2 swap
Size 148 KB
Load time 55 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~446 KB and ~892 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
Network Waterfall
100 requests over 2359ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.0 s LCP 3.0 shttps://uchicago.edu// https://uchicago.edu/ — 301 — 209 B — 67 ms — http/1.1https://www.uchicago.edu/www.uchicago.edu/ https://www.uchicago.edu/ — 200 — 33.5 KiB — 571 ms — h2https://www.uchicago.edu/dist/intranet/static/css/main.9ce48894.chunk.csswww.uchicago.edu/dist/intranet/stat... https://www.uchicago.edu/dist/intranet/static/css/main.9ce48894.chunk.css — 200 — 7.7 KiB — 18 ms — h2https://www.uchicago.edu/dist/intranet/static/js/188.d88c0093.chunk.jswww.uchicago.edu/dist/intranet/stat... https://www.uchicago.edu/dist/intranet/static/js/188.d88c0093.chunk.js — 200 — 195.9 KiB — 27 ms — h2https://www.uchicago.edu/dist/intranet/static/js/main.8c2186e0.chunk.jswww.uchicago.edu/dist/intranet/stat... https://www.uchicago.edu/dist/intranet/static/js/main.8c2186e0.chunk.js — 200 — 10.3 KiB — 19 ms — h2https://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/UChicagoSansSerif.cssuchicago-brand-fonts.s3.us-east-2.a... https://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/UChicagoSansSerif.css — 200 — 4.0 KiB — 132 ms — http/1.1https://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/UChicagoSerif.cssuchicago-brand-fonts.s3.us-east-2.a... https://uchicago-brand-fonts.s3.us-east-2.amazonaws.com/UChicagoSerif.css — 200 — 2.3 KiB — 133 ms — http/1.1https://www.uchicago.edu/sitecore/api/jss/dictionary/intranet/en?sc_apikey={D1E8A715-D31D-4064-ADD2-C564C07E5F7D}www.uchicago.edu/sitecore/api/jss/d... https://www.uchicago.edu/sitecore/api/jss/dictionary/intranet/en?sc_apikey={D1E8A715-D31D-4064-ADD2-C564C07E5F7D} — 200 — 1.4 KiB — 56 ms — h2https://www.uchicago.edu/dist/intranet/favicon.icowww.uchicago.edu/dist/intranet/favi... https://www.uchicago.edu/dist/intranet/favicon.ico — 200 — 15.0 KiB — 7 ms — h2https://www.uchicago.edu/sitecore/api/layout/render/jss?item=%2F&sc_apikey=%7BD1E8A715-D31D-4064-ADD2-C564C07E5F7D%7D&sc_lang=enwww.uchicago.edu/sitecore/api/layou... https://www.uchicago.edu/sitecore/api/layout/render/jss?item=%2F&sc_apikey=%7BD1E8A715-D31D-4064-ADD2-C564C07E5F7D%7D&sc_lang=en — 200 — 25.6 KiB — 150 ms — h2https://www.uchicago.edu/layouts/system/VisitorIdentification.jswww.uchicago.edu/layouts/system/Vis... https://www.uchicago.edu/layouts/system/VisitorIdentification.js — 200 — 1.5 KiB — 53 ms — h2https://www.uchicago.edu/dist/intranet/static/css/EduHeader.d7662d17.chunk.csswww.uchicago.edu/dist/intranet/stat... https://www.uchicago.edu/dist/intranet/static/css/EduHeader.d7662d17.chunk.css — 200 — 4.6 KiB — 36 ms — h2https://www.uchicago.edu/dist/intranet/static/js/EduHeader.ce25d182.chunk.jswww.uchicago.edu/dist/intranet/stat... https://www.uchicago.edu/dist/intranet/static/js/EduHeader.ce25d182.chunk.js — 200 — 5.2 KiB — 36 ms — h2https://www.uchicago.edu/dist/intranet/static/js/2.9a23649f.chunk.jswww.uchicago.edu/dist/intranet/stat... https://www.uchicago.edu/dist/intranet/static/js/2.9a23649f.chunk.js — 200 — 9.5 KiB — 35 ms — 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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 1053ms · 667KB · $14/mo
Unattributable
Other
Costly
Execution 298ms
Transfer 0 KB
Monthly Cost $4/mo
www.uchicago.edu
Other
Costly
Execution 242ms
Transfer 34 KB
Monthly Cost $3/mo
www.uchicago.edu
Other
Costly
Execution 237ms
Transfer 196 KB
Unused 56%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 88ms
Transfer 156 KB
Unused 42%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 69ms
Transfer 148 KB
Unused 44%
Monthly Cost $1/mo
www.uchicago.edu
Other
Optional
Execution 60ms
Transfer 10 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 59ms
Transfer 124 KB
Unused 51%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 298ms and costs ~$4/month
  • www.uchicago.edu adds 242ms and costs ~$3/month
  • www.uchicago.edu adds 237ms 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

Unattributable takes 298ms 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.uchicago.edu takes 242ms 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.uchicago.edu takes 237ms 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

56% of www.uchicago.edu's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

51% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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