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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
62
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

3.65 s

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

12.65 s

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

150 ms

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

0.051

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

5.33 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.

12.75 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
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
11.9 MB transferred, 75 requests
FIX
11.9 MB transferred, 75 requests
Critical::
Page weighs 12.8 MB (11.9 MB transferred)
Warning::
Images are 2.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.5 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::
75 HTTP requests
Info::
Estimated 2.5 g CO2 per page load
11.9 MB / 2.4 MB budget
11.9 MB transferred
75 requests
2.5 g CO2 per page load
Other 8.6 MiB 72%
Images 2.5 MiB 21%
JavaScript 563.3 KiB 5%
Fonts 189.2 KiB 2%
CSS 59.7 KiB 0%
HTML 18.7 KiB 0%
Other 5.3 KiB 0%
Other 708 B 0%
Other 549 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 (11.9 MiB of 11.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2358ms total JS execution
FIX
2358ms total JS execution
Warning::
https://www.cornell.edu/: 954ms CPU time
Warning::
Unattributable: 615ms CPU time
Info::
https://ajax.googleapis.com/ajax/libs/jquery/1.10....: 249ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-PMZ1...: 216ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WW8...: 164ms CPU time
Warning::
Third-party scripts: 2358ms (100% of total)

Main Thread Breakdown

Other 36% Script Evaluation 29% Style & Layout 19% Rendering 8% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.cornell.edu/954ms47ms6ms3rd
Unattributable615ms17ms0ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js249ms196ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-PMZ19X3F8W216ms180ms33ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WW83RG9164ms124ms30ms3rd
https://www.cornell.edu/assets/core/js/lib/modernizr.js?ver=20250512102ms46ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-PMZ19X3F8W&cx=c&gtm=4e64f058ms20ms38ms3rd
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-PMZ19X3F8W156 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
75 resources · 11.9 MB · 242 KB savings available
FIX
75 resources · 11.9 MB · 242 KB savings available
Warning::
Page weight 10.9 MB over 1MB target
Got: 11.9 MB Expected: ≤ 1 MB
Info::
~242 KB of savings available
Warning::
74 third-party resources (100% of weight)
Info::
3 resources over 200KB
75 resources · 11.9 MiB · 74 third-party 10.9 MiB over 1MB target
Media 72% · 8.6 MiB
Image 21% · 2.5 MiB
JavaScript 5% · 563.3 KiB
Font 2% · 189.2 KiB
CSS 0% · 59.7 KiB
Document 0% · 19.5 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
34 images, 0 KB saveable
REVIEW
34 images, 0 KB saveable
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/360x360/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
data:image/gif;base64,R0lGODlhEAAJAIAAAP///wAAACH5... 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/campaign... 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/400x225/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
34 images 2.5 MB
0 oversized -0 KB
32 legacy format
10 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

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 (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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.7 s LCP 12.6 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 — 14 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 — 674 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 — 11 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 — 9 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 — 10 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 — 11 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 — 4 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 — 15 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 — 22 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 — 18.8 KiB — 15 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 — 17 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 — 4 ms — font-display: swap
l woff2 swap
Size 15 KB
Load time 14 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
fontcustom.woff woff swap
Size 6 KB
Load time 674 ms
Start 1.8 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 11 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 15 KB
Load time 9 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 16 KB
Load time 10 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 16 KB
Load time 11 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 15 KB
Load time 4 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 15 KB
Load time 15 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 22 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 15 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 17 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 15 KB
Load time 4 ms
Start 2.2 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
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
75 requests over 3791ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.7 s LCP 12.6 shttps://cornell.edu// https://cornell.edu/ — 301 — 113 B — 428 ms — http/1.1https://www.cornell.edu/www.cornell.edu/ https://www.cornell.edu/ — 200 — 18.7 KiB — 819 ms — h2https://use.typekit.net/gog6dck.jsuse.typekit.net/gog6dck.js https://use.typekit.net/gog6dck.js — 200 — 7.0 KiB — 183 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 — 354 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 — 386 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 — 700 B — 385 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 — 305 ms — h2https://cdn.universityrelations.cornell.edu/images/research-2025.jpgcdn.universityrelations.cornell.edu... https://cdn.universityrelations.cornell.edu/images/research-2025.jpg — 200 — 121.7 KiB — 265 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 — 521 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 — 288 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 — 167 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 — 71 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 — 66 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 — 14 ms — h2https://www.cornell.edu/site.webmanifestwww.cornell.edu/site.webmanifest https://www.cornell.edu/site.webmanifest — 200 — 708 B — 1.1 s — 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 — 182 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 — 218 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 — 218 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 — 232 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 — 222 ms — 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h2https://6120104.global.siteimproveanalytics.io/image.aspx?url=https%3A%2F%2Fwww.cornell.edu%2F&title=Cornell%20University&res=412x823&accountid=6120104&rt=2239&prev=4a90f0a0-ed04-c51c-7055-037619b93fa8&luid=81b308be-1d88-6c8a-9e3f-db256ebd7f51&rnd=481546120104.global.siteimproveanalytics... https://6120104.global.siteimproveanalytics.io/image.aspx?url=https%3A%2F%2Fwww.cornell.edu%2F&title=Cornell%20University&res=412x823&accountid=6120104&rt=2239&prev=4a90f0a0-ed04-c51c-7055-037619b93fa8&luid=81b308be-1d88-6c8a-9e3f-db256ebd7f51&rnd=48154 — 200 — 210 B — 158 ms — h2https://cdnsecakmi.kaltura.com/p/537811/sp/53781100/download/entry_id/1_6qqtj7t8/flavor/1_e0z0e2vs/relocate/ResearchImpactLoop_(HD_1080_-_WEB_(H264_4000)).mp4cdnsecakmi.kaltura.com/p/537811/sp/... https://cdnsecakmi.kaltura.com/p/537811/sp/53781100/download/entry_id/1_6qqtj7t8/flavor/1_e0z0e2vs/relocate/ResearchImpactLoop_(HD_1080_-_WEB_(H264_4000)).mp4 — 206 — 8.6 MiB — 3 ms — http/1.1https://www.cornell.edu/favicon.icowww.cornell.edu/favicon.ico https://www.cornell.edu/favicon.ico — 200 — 4.3 KiB — 169 ms — h2https://media.univcomm.cornell.edu/photos/360x360/AB69298D-A62D-B445-9A92E772C3BAD9DD.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/AB69298D-A62D-B445-9A92E772C3BAD9DD.jpg — 200 — 82.6 KiB — 61 ms — h2data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7data:image/gif;base64,R0lGODlhAQABA... data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7 — 200 — 0 B — 0 ms — datahttps://media.univcomm.cornell.edu/photos/360x360/A746AA91-F77D-AB4C-9F141556580C6E4C.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/A746AA91-F77D-AB4C-9F141556580C6E4C.jpg — 200 — 87.0 KiB — 60 ms — h2https://media.univcomm.cornell.edu/photos/360x360/76583D5F-E4A2-0A6C-F49C1FC9E7067410.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/76583D5F-E4A2-0A6C-F49C1FC9E7067410.jpg — 200 — 74.0 KiB — 60 ms — h2https://media.univcomm.cornell.edu/photos/360x360/1A07FF21-BAD7-6A1C-BB7C63EB8210FBE7.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/1A07FF21-BAD7-6A1C-BB7C63EB8210FBE7.jpg — 200 — 120.5 KiB — 60 ms — h2https://media.univcomm.cornell.edu/photos/360x360/302DED93-F593-9467-3E522A81AC61C14B.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/302DED93-F593-9467-3E522A81AC61C14B.jpg — 200 — 54.0 KiB — 58 ms — h2https://media.univcomm.cornell.edu/photos/360x360/60EBEEC5-CE92-845C-74B7376D643E24EB.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/60EBEEC5-CE92-845C-74B7376D643E24EB.jpg — 200 — 47.4 KiB — 60 ms — h2https://media.univcomm.cornell.edu/photos/360x360/A1D836A8-CC07-608E-7D68529F791B6AA9.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/A1D836A8-CC07-608E-7D68529F791B6AA9.jpg — 200 — 62.1 KiB — 60 ms — h2https://media.univcomm.cornell.edu/photos/360x360/8BB745DD-F57F-EC7B-13CA4386B1D18703.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/8BB745DD-F57F-EC7B-13CA4386B1D18703.jpg — 200 — 39.4 KiB — 95 ms — h2https://media.univcomm.cornell.edu/photos/360x360/CBEDE10A-9C64-465F-AC30FBF6802F84F3.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/CBEDE10A-9C64-465F-AC30FBF6802F84F3.jpg — 200 — 68.5 KiB — 61 ms — h2https://media.univcomm.cornell.edu/photos/360x360/959BCAAF-FC30-8716-A3B213D64FE3D41A.jpgmedia.univcomm.cornell.edu/photos/3... https://media.univcomm.cornell.edu/photos/360x360/959BCAAF-FC30-8716-A3B213D64FE3D41A.jpg — 200 — 108.4 KiB — 103 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 2358ms · 498KB · $31/mo
www.cornell.edu
Other
Costly
Execution 954ms
Transfer 19 KB
Monthly Cost $13/mo
Unattributable
Other
Costly
Execution 615ms
Transfer 0 KB
Monthly Cost $8/mo
ajax.googleapis.com
Other
Costly
Execution 249ms
Transfer 33 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 216ms
Transfer 156 KB
Unused 43%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 164ms
Transfer 127 KB
Unused 50%
Monthly Cost $2/mo
www.cornell.edu
Other
Optional
Execution 102ms
Transfer 6 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 58ms
Transfer 156 KB
Unused 71%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.cornell.edu adds 954ms and costs ~$13/month
  • Unattributable adds 615ms and costs ~$8/month
  • ajax.googleapis.com adds 249ms and costs ~$3/month
  • Google Tag Manager adds 216ms 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 954ms 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 615ms 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

ajax.googleapis.com takes 249ms 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 216ms 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

50% 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

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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