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https://uchicago.edu

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
14
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.

3.92 s

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

14.37 s

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

1.13 s

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

1.454

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

6.38 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.

19.28 s

Page Load Progression

548 ms
1.1 s
1.6 s
2.2 s
2.7 s
3.3 s
3.8 s
4.4 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
12.7 MB transferred, 98 requests
FIX
12.7 MB transferred, 98 requests
Critical::
Page weighs 16.1 MB (12.7 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::
98 HTTP requests
Info::
Estimated 2.7 g CO2 per page load
12.7 MB / 2.4 MB budget
12.7 MB transferred
98 requests
2.7 g CO2 per page load
Other 10.1 MiB 79%
JavaScript 1.1 MiB 9%
Fonts 1.0 MiB 8%
Images 258.3 KiB 2%
Other 96.2 KiB 1%
CSS 43.8 KiB 0%
HTML 33.5 KiB 0%
Other 25.7 KiB 0%
Other 15.3 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 (12.7 MiB of 12.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4506ms total JS execution
FIX
4506ms total JS execution
Warning::
https://www.uchicago.edu/dist/intranet/static/js/1...: 1209ms CPU time
Warning::
Unattributable: 847ms CPU time
Warning::
https://www.uchicago.edu/: 591ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2V4M...: 383ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DBDW...: 268ms CPU time
Warning::
Third-party scripts: 4506ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 24% Style & Layout 12% Script Parsing & Compilation 11%
ScriptTotalScriptingParse/CompileParty
https://www.uchicago.edu/dist/intranet/static/js/188.d88c0093.chunk.js1209ms704ms99ms3rd
Unattributable847ms24ms0ms3rd
https://www.uchicago.edu/591ms82ms5ms3rd
https://www.googletagmanager.com/gtag/js?id=G-2V4M4Z833J383ms271ms69ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DBDWJCS0JR&cx=c&_slc=1268ms214ms51ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NCZDFHH252ms194ms44ms3rd
https://www.uchicago.edu/dist/intranet/static/js/main.8c2186e0.chunk.js242ms234ms7ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js197ms168ms26ms3rd
https://kit.fontawesome.com/8a6f4b518c.js126ms122ms2ms3rd
https://siteimproveanalytics.com/js/siteanalyze_66356295.js117ms69ms41ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
42 scripts, 525 KB unused
FIX
42 scripts, 525 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: 525 KB
525 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://www.uchicago.edu/dist/intranet/static/js/Footer.85a22dba.chunk.js3 KB—✓3rd
https://www.uchicago.edu/dist/intranet/static/js/9.97029b91.chunk.js6 KB—✓3rd
https://www.uchicago.edu/dist/intranet/static/js/PageBanner.22fbcd26.chunk.js1 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
98 resources · 12.7 MB · 525 KB savings available
FIX
98 resources · 12.7 MB · 525 KB savings available
Warning::
Page weight 11.7 MB over 1MB target
Got: 12.7 MB Expected: ≤ 1 MB
Info::
~525 KB of savings available
Warning::
97 third-party resources (100% of weight)
Info::
1 resources over 200KB
98 resources · 12.7 MiB · 97 third-party 11.7 MiB over 1MB target
Media 79% · 10.1 MiB
JavaScript 9% · 1.1 MiB
Font 8% · 1.0 MiB
Image 2% · 273.4 KiB
CSS 1% · 137.7 KiB
Document 0% · 33.7 KiB
Other 0% · 28.0 KiB

~524.8 KiB of savings available

Remove unused JavaScript: 524.8 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.

C
Image Optimization
Action
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
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.
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.
10 images 258 KB
0 oversized -0 KB
10 legacy format
4 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

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 (1035 KB)
PASS
12 fonts (1035 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

1035 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 3.9 s LCP 14.4 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 — 168 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 — 165 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 — 143.0 KiB — 164 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-1.woff2pro-fa-regular-400-1.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-1.woff2 — 16.7 KiB — 79 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 — 14.4 KiB — 24 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 — 27 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 — 37 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 — 39.5 KiB — 35 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 — 61 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 — 59 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 — 21 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 — 68 ms — font-display: swap
UChicagoSansSerif-Regul... woff2 swap
Size 144 KB
Load time 168 ms
Start 1.1 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 165 ms
Start 1.1 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 164 ms
Start 1.1 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-400-1.woff2 woff2 swap
Size 17 KB
Load time 79 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-0.woff2 woff2 swap
Size 14 KB
Load time 24 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 27 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 37 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 35 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
UChicagoSerif-Regular.w... woff2 swap
Size 146 KB
Load time 61 ms
Start 1.5 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 59 ms
Start 1.5 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-400-12.w... woff2 swap
Size 19 KB
Load time 21 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
UChicagoSansSerif-Bold.... woff2 swap
Size 148 KB
Load time 68 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
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
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
98 requests over 2090ms
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 3.9 s LCP 14.4 shttps://uchicago.edu// https://uchicago.edu/ — 301 — 209 B — 49 ms — http/1.1https://www.uchicago.edu/www.uchicago.edu/ https://www.uchicago.edu/ — 200 — 33.5 KiB — 404 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 — 30 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 — 35 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 — 112 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 — 116 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 — 70 ms — h2https://www.uchicago.edu/dist/intranet/favicon.icowww.uchicago.edu/dist/intranet/favi... https://www.uchicago.edu/dist/intranet/favicon.ico — 200 — 15.1 KiB — 14 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 — 156 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 — 73 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 — 74 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 — 74 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 — 73 ms — 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https://66356295.global.siteimproveanalytics.io/image.aspx?url=https%3A%2F%2Fwww.uchicago.edu%2F&title=The%20University%20of%20Chicago&res=412x823&accountid=66356295&rt=1606&prev=ddc73312-52bf-659c-2e23-22f80daeb59c&luid=70800017-81dc-d2f1-e51a-14027f4b65be&rnd=23288 — 200 — 210 B — 80 ms — h2https://script.hotjar.com/modules.6a0f3932cb1341a35c18.jsscript.hotjar.com/modules.6a0f3932c... https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js — 200 — 56.6 KiB — 33 ms — 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https://www.google-analytics.com/g/collect?v=2&tid=G-2V4M4Z833J&gtm=45je64h1v899740505za200zb847300492zd847300492&_p=1776797905474&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=859347587.1776797906&frm=0&pscdl=noapi&rcb=9&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938469~117266401&sid=1776797906&sct=1&seg=0&dl=https%3A%2F%2Fwww.uchicago.edu%2F&dt=The%20University%20of%20Chicago&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=1846 — 204 — 408 B — 45 ms — h2https://plausible.io/api/eventplausible.io/api/event https://plausible.io/api/event — 202 — 522 B — 100 ms — 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https://www.google-analytics.com/g/collect?v=2&tid=G-DBDWJCS0JR&gtm=45je64h1v9123080141za20g&_p=1776797905474&gcd=13l3l3l3l2l1&npa=0&dma=0&_eu=EBAI&are=1&cid=859347587.1776797906&frm=0&ir=1&pscdl=noapi&rcb=7&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938468~117266401&dl=https%3A%2F%2Fwww.uchicago.edu%2F&dt=The%20University%20of%20Chicago&sid=1776797906&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&gap.uat=0~115938465~115938468~117266401~118128922&tfd=2064 — 204 — 20 B — 26 ms — h3
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 4506ms · 1043KB · $60/mo
www.uchicago.edu
Other
Costly
Execution 1209ms
Transfer 196 KB
Unused 56%
Monthly Cost $16/mo
Unattributable
Other
Costly
Execution 847ms
Transfer 0 KB
Monthly Cost $11/mo
www.uchicago.edu
Other
Costly
Execution 591ms
Transfer 34 KB
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 383ms
Transfer 156 KB
Unused 42%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 268ms
Transfer 148 KB
Unused 44%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 252ms
Transfer 124 KB
Unused 51%
Monthly Cost $3/mo
www.uchicago.edu
Other
Costly
Execution 242ms
Transfer 10 KB
Monthly Cost $3/mo
Hotjar
Session Replay
Optional
Execution 197ms
Transfer 57 KB
Unused 67%
Monthly Cost $3/mo
kit.fontawesome.com
Other
Optional
Execution 126ms
Transfer 6 KB
Monthly Cost $2/mo
siteimproveanalytics.com
Other
Optional
Execution 117ms
Transfer 89 KB
Unused 82%
Monthly Cost $2/mo
Google Analytics
Analytics
Optional
Execution 116ms
Transfer 21 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 99ms
Transfer 156 KB
Unused 71%
Monthly Cost $1/mo
www.uchicago.edu
Other
Optional
Execution 57ms
Transfer 47 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.uchicago.edu adds 1209ms and costs ~$16/month
  • Unattributable adds 847ms and costs ~$11/month
  • www.uchicago.edu adds 591ms and costs ~$8/month
  • Google Tag Manager adds 383ms and costs ~$5/month
  • Google Tag Manager adds 268ms and costs ~$4/month
  • Google Tag Manager adds 252ms and costs ~$3/month
  • www.uchicago.edu adds 242ms 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.uchicago.edu takes 1209ms 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

Unattributable takes 847ms 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 591ms 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

Google Tag Manager takes 383ms 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

Google Tag Manager takes 268ms 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

Google Tag Manager 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

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

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

67% of Hotjar'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

82% of siteimproveanalytics.com'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

71% 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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