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https://cornell.edu

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
79
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

1.24 s

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

2.80 s

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

0 ms

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

0.006

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

1.76 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.

2.82 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
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
17.6 MB transferred, 84 requests
FIX
17.6 MB transferred, 84 requests
Critical::
Page weighs 18.6 MB (17.6 MB transferred)
Warning::
Images are 3.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.3 MB
Warning::
JavaScript is 563 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 563 KB
Info::
84 HTTP requests
Info::
Estimated 3.7 g CO2 per page load
17.6 MB / 2.4 MB budget
17.6 MB transferred
84 requests
3.7 g CO2 per page load
Other 13.5 MiB 77%
Images 3.3 MiB 19%
JavaScript 563.3 KiB 3%
Fonts 189.2 KiB 1%
CSS 59.7 KiB 0%
HTML 18.7 KiB 0%
Other 6.1 KiB 0%
Other 687 B 0%
Other 550 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 (17.6 MiB of 17.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
18 scripts, 242 KB unused
FIX
18 scripts, 242 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-PMZ1...: 110 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-PMZ1...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WW8...: 64 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.cornell.edu/assets/core/js/cornell.js?...: unminified — 3 KB could be saved
Info::
Total unused JavaScript: 242 KB
242 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-PMZ19X3F8W&cx=c&gtm=4e64f0156 KB110 KB (71%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-PMZ19X3F8W157 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WW83RG9127 KB64 KB (50%)✓3rd
https://www.cornell.edu/assets/core/js/cornell.js?ver=20191023a10 KB—✗3rd
https://www.cornell.edu/assets/js/date.js7 KB—✓3rd
https://www.cornell.edu/assets/js/cornelledu.js?ver=20230613a7 KB—✗3rd
https://www.cornell.edu/assets/core/js/lib/plugins.js10 KB—✗3rd
https://www.cornell.edu/assets/core/js/lib/equalize.min.js1 KB—✓3rd
https://use.typekit.net/gog6dck.js7 KB—✓3rd
https://www.cornell.edu/assets/js/cookie-monster.js?ver=202503091 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

D
Page Weight Inventory
Action
84 resources · 17.6 MB · 242 KB savings available
FIX
84 resources · 17.6 MB · 242 KB savings available
Warning::
Page weight 16.6 MB over 1MB target
Got: 17.6 MB Expected: ≤ 1 MB
Info::
~242 KB of savings available
Warning::
83 third-party resources (100% of weight)
Info::
5 resources over 200KB
84 resources · 17.6 MiB · 83 third-party 16.6 MiB over 1MB target
Media 77% · 13.5 MiB
Image 19% · 3.3 MiB
JavaScript 3% · 563.3 KiB
Font 1% · 189.2 KiB
CSS 0% · 59.7 KiB
Document 0% · 20.4 KiB
Other 0% · 1.3 KiB

~241.8 KiB of savings available

Remove unused JavaScript: 241.8 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
41 images, 0 KB saveable
REVIEW
41 images, 0 KB saveable
Warning::
https://media.univcomm.cornell.edu/photos/campaign... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.univcomm.cornell.edu/photos/360x360/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.univcomm.cornell.edu/photos/360x360/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cornell.edu/assets/images/campaign/ezr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.univcomm.cornell.edu/photos/400x225/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.univcomm.cornell.edu/photos/360x360/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.univcomm.cornell.edu/photos/360x360/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.univcomm.cornell.edu/photos/400x225/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
41 images 3.3 MB
0 oversized -0 KB
39 legacy format
8 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

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

B
JS Execution Cost
521ms total JS execution
REVIEW
521ms total JS execution
Warning::
https://www.cornell.edu/: 251ms CPU time
Info::
Unattributable: 209ms CPU time
Info::
https://ajax.googleapis.com/ajax/libs/jquery/1.10....: 61ms CPU time
Warning::
Third-party scripts: 521ms (100% of total)

Main Thread Breakdown

Other 41% Script Evaluation 27% Style & Layout 19% Rendering 6% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.cornell.edu/251ms14ms1ms3rd
Unattributable209ms6ms0ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js61ms45ms3ms3rd
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 (189 KB)
PASS
12 fonts (189 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

189 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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.2 s LCP 2.8 shttps://use.typekit.net/af/442215/000000000000000000010b5a/27/l?subset_id=2&fvd=n4&v=3l https://use.typekit.net/af/442215/000000000000000000010b5a/27/l?subset_id=2&fvd=n4&v=3 — 15.2 KiB — 18 ms — font-display: swaphttps://www.cornell.edu/assets/core/fonts/fontcustom.wofffontcustom.woff https://www.cornell.edu/assets/core/fonts/fontcustom.woff — 5.9 KiB — 618 ms — font-display: swaphttps://use.typekit.net/af/ac6334/000000000000000000012059/27/l?subset_id=2&fvd=n4&v=3l https://use.typekit.net/af/ac6334/000000000000000000012059/27/l?subset_id=2&fvd=n4&v=3 — 19.1 KiB — 9 ms — font-display: swaphttps://use.typekit.net/af/8dd886/000000000000000000010b5c/27/l?subset_id=2&fvd=n5&v=3l https://use.typekit.net/af/8dd886/000000000000000000010b5c/27/l?subset_id=2&fvd=n5&v=3 — 14.8 KiB — 12 ms — font-display: swaphttps://use.typekit.net/af/1709eb/000000000000000000010b60/27/l?subset_id=2&fvd=n7&v=3l https://use.typekit.net/af/1709eb/000000000000000000010b60/27/l?subset_id=2&fvd=n7&v=3 — 15.7 KiB — 13 ms — font-display: swaphttps://use.typekit.net/af/cef9f3/000000000000000000010b5e/27/l?subset_id=2&fvd=n6&v=3l https://use.typekit.net/af/cef9f3/000000000000000000010b5e/27/l?subset_id=2&fvd=n6&v=3 — 15.4 KiB — 14 ms — font-display: swaphttps://use.typekit.net/af/1aea0d/000000000000000000012106/27/l?subset_id=2&fvd=n3&v=3l https://use.typekit.net/af/1aea0d/000000000000000000012106/27/l?subset_id=2&fvd=n3&v=3 — 15.7 KiB — 17 ms — font-display: swaphttps://use.typekit.net/af/ba2099/000000000000000000010b58/27/l?subset_id=2&fvd=n3&v=3l https://use.typekit.net/af/ba2099/000000000000000000010b58/27/l?subset_id=2&fvd=n3&v=3 — 15.0 KiB — 6 ms — font-display: swaphttps://use.typekit.net/af/5464d5/00000000000000000001205a/27/l?subset_id=2&fvd=i4&v=3l https://use.typekit.net/af/5464d5/00000000000000000001205a/27/l?subset_id=2&fvd=i4&v=3 — 19.0 KiB — 4 ms — font-display: swaphttps://use.typekit.net/af/04ec74/00000000000000000001205b/27/l?subset_id=2&fvd=n7&v=3l https://use.typekit.net/af/04ec74/00000000000000000001205b/27/l?subset_id=2&fvd=n7&v=3 — 18.9 KiB — 7 ms — font-display: swaphttps://use.typekit.net/af/8cf83d/00000000000000000001205c/27/l?subset_id=2&fvd=i7&v=3l https://use.typekit.net/af/8cf83d/00000000000000000001205c/27/l?subset_id=2&fvd=i7&v=3 — 19.1 KiB — 8 ms — font-display: swaphttps://use.typekit.net/af/2d5f33/000000000000000000012107/27/l?subset_id=2&fvd=i3&v=3l https://use.typekit.net/af/2d5f33/000000000000000000012107/27/l?subset_id=2&fvd=i3&v=3 — 15.5 KiB — 10 ms — font-display: swap
l woff2 swap
Size 15 KB
Load time 18 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
fontcustom.woff woff swap
Size 6 KB
Load time 618 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
l woff2 swap
Size 19 KB
Load time 9 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 15 KB
Load time 12 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 16 KB
Load time 13 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 15 KB
Load time 14 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 16 KB
Load time 17 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 15 KB
Load time 6 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 4 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 7 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 8 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 15 KB
Load time 10 ms
Start 1.7 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)

Fixing the unchecked items could save ~2 KB and ~4 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
84 requests over 3212ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.2 s LCP 2.8 shttps://cornell.edu// https://cornell.edu/ — 301 — 113 B — 440 ms — http/1.1https://www.cornell.edu/www.cornell.edu/ https://www.cornell.edu/ — 200 — 18.7 KiB — 191 ms — h2https://use.typekit.net/gog6dck.jsuse.typekit.net/gog6dck.js https://use.typekit.net/gog6dck.js — 200 — 7.0 KiB — 44 ms — h2https://www.cornell.edu/assets/core/css/cornell.css?ver=20250512www.cornell.edu/assets/core/css/cor... https://www.cornell.edu/assets/core/css/cornell.css?ver=20250512 — 200 — 45.4 KiB — 370 ms — h2https://www.cornell.edu/assets/css/style.css?ver=20250512www.cornell.edu/assets/css/style.cs... https://www.cornell.edu/assets/css/style.css?ver=20250512 — 200 — 12.4 KiB — 67 ms — h2https://www.cornell.edu/assets/css/print.css?ver=20250512www.cornell.edu/assets/css/print.cs... https://www.cornell.edu/assets/css/print.css?ver=20250512 — 200 — 694 B — 38 ms — h2https://www.cornell.edu/assets/core/js/lib/modernizr.js?ver=20250512www.cornell.edu/assets/core/js/lib/... https://www.cornell.edu/assets/core/js/lib/modernizr.js?ver=20250512 — 200 — 6.4 KiB — 46 ms — h2https://cdn.universityrelations.cornell.edu/images/research-2025.jpgcdn.universityrelations.cornell.edu... https://cdn.universityrelations.cornell.edu/images/research-2025.jpg — 200 — 121.8 KiB — 259 ms — h2https://media.univcomm.cornell.edu/photos/360x360/AA35CCCB-A98C-F255-3FB3D87C97A41615.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/AA35CCCB-A98C-F255-3FB3D87C97A41615.jpg — 200 — 188.6 KiB — 370 ms — h2https://www.cornell.edu/assets/css/social-grid.csswww.cornell.edu/assets/css/social-g... https://www.cornell.edu/assets/css/social-grid.css — 200 — 1.2 KiB — 37 ms — h2https://media.univcomm.cornell.edu/photos/360x360/AA714B42-BFFF-B6A8-02E0E198925385AC.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/AA714B42-BFFF-B6A8-02E0E198925385AC.jpg — 200 — 110.7 KiB — 143 ms — h2https://media.univcomm.cornell.edu/photos/360x360/F4FD8094-E12B-0957-5E262F301DDD8B91.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/F4FD8094-E12B-0957-5E262F301DDD8B91.jpg — 200 — 97.2 KiB — 67 ms — h2https://use.typekit.net/af/442215/000000000000000000010b5a/27/l?subset_id=2&fvd=n4&v=3use.typekit.net/af/442215/000000000... https://use.typekit.net/af/442215/000000000000000000010b5a/27/l?subset_id=2&fvd=n4&v=3 — 200 — 15.2 KiB — 18 ms — h2https://media.univcomm.cornell.edu/photos/400x225/AA664986-C9E4-E7DB-D5AC14ED3C2BCD8D.jpgmedia.univcomm.cornell.edu/photos/4... https://media.univcomm.cornell.edu/photos/400x225/AA664986-C9E4-E7DB-D5AC14ED3C2BCD8D.jpg — 200 — 79.5 KiB — 112 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js — 200 — 32.8 KiB — 206 ms — h2https://www.cornell.edu/assets/js/jquery.timeago.jswww.cornell.edu/assets/js/jquery.ti... https://www.cornell.edu/assets/js/jquery.timeago.js — 200 — 2.6 KiB — 82 ms — h2https://www.cornell.edu/assets/core/js/Imager.min.jswww.cornell.edu/assets/core/js/Imag... https://www.cornell.edu/assets/core/js/Imager.min.js — 200 — 2.4 KiB — 82 ms — h2https://www.cornell.edu/assets/js/cornelledu.js?ver=20230613awww.cornell.edu/assets/js/cornelled... https://www.cornell.edu/assets/js/cornelledu.js?ver=20230613a — 200 — 7.4 KiB — 84 ms — h2https://www.cornell.edu/assets/core/js/lib/plugins.jswww.cornell.edu/assets/core/js/lib/... https://www.cornell.edu/assets/core/js/lib/plugins.js — 200 — 10.2 KiB — 81 ms — h2https://www.cornell.edu/assets/core/js/lib/equalize.min.jswww.cornell.edu/assets/core/js/lib/... https://www.cornell.edu/assets/core/js/lib/equalize.min.js — 200 — 663 B — 121 ms — h2https://www.cornell.edu/assets/core/js/cornell.js?ver=20191023awww.cornell.edu/assets/core/js/corn... https://www.cornell.edu/assets/core/js/cornell.js?ver=20191023a — 200 — 9.8 KiB — 574 ms — h2https://www.cornell.edu/assets/js/cookie-monster.js?ver=20250309www.cornell.edu/assets/js/cookie-mo... https://www.cornell.edu/assets/js/cookie-monster.js?ver=20250309 — 200 — 1.2 KiB — 121 ms — h2https://www.cornell.edu/assets/js/date.jswww.cornell.edu/assets/js/date.js https://www.cornell.edu/assets/js/date.js — 200 — 7.4 KiB — 119 ms — h2https://www.cornell.edu/assets/js/jquery.inview2.min.jswww.cornell.edu/assets/js/jquery.in... https://www.cornell.edu/assets/js/jquery.inview2.min.js — 200 — 874 B — 120 ms — h2https://www.cornell.edu/site.webmanifestwww.cornell.edu/site.webmanifest https://www.cornell.edu/site.webmanifest — 200 — 687 B — 92 ms — h2https://cdnjs.cloudflare.com/ajax/libs/object-fit/0.4.3/polyfill.object-fit.min.jscdnjs.cloudflare.com/ajax/libs/obje... https://cdnjs.cloudflare.com/ajax/libs/object-fit/0.4.3/polyfill.object-fit.min.js — 200 — 3.4 KiB — 49 ms — h3https://media.univcomm.cornell.edu/photos/400x225/97ED1A7B-A4EA-2A1D-0682FB1FC93E4312.jpgmedia.univcomm.cornell.edu/photos/4... https://media.univcomm.cornell.edu/photos/400x225/97ED1A7B-A4EA-2A1D-0682FB1FC93E4312.jpg — 200 — 213.3 KiB — 146 ms — h2https://media.univcomm.cornell.edu/photos/360x360/AA505462-AF6E-14EB-391E7B23F0B05978.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/AA505462-AF6E-14EB-391E7B23F0B05978.jpg — 200 — 171.0 KiB — 140 ms — h2https://media.univcomm.cornell.edu/photos/360x360/AA427B20-D637-6D0E-190A5C495943239C.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/AA427B20-D637-6D0E-190A5C495943239C.jpg — 200 — 179.9 KiB — 144 ms — h2https://media.univcomm.cornell.edu/photos/360x360/AA85866B-C44E-42F6-24C93F3A6A54E260.jpgmedia.univcomm.cornell.edu/photos/3... 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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 521ms · 51KB · $7/mo
www.cornell.edu
Other
Costly
Execution 251ms
Transfer 19 KB
Monthly Cost $3/mo
Unattributable
Other
Costly
Execution 209ms
Transfer 0 KB
Monthly Cost $3/mo
ajax.googleapis.com
Other
Optional
Execution 61ms
Transfer 33 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.cornell.edu adds 251ms and costs ~$3/month
  • Unattributable adds 209ms 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.cornell.edu takes 251ms 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 209ms 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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