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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
3
REVIEW
5
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.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

3.87 s

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

8.51 s

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

236 ms

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

0.001

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

3.87 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.

8.60 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 5 REVIEW 3 FIX
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 (1.8 MiB of 1.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
40 resources · 1.8 MB · 160 KB savings available
FIX
40 resources · 1.8 MB · 160 KB savings available
Warning::
Page weight 813 KB over 1MB target
Got: 1.8 MB Expected: ≤ 1 MB
Info::
~160 KB of savings available
Warning::
39 third-party resources (100% of weight)
Info::
1 resources over 200KB
40 resources · 1.8 MiB · 39 third-party 813.4 KiB over 1MB target
Image 69% · 1.2 MiB
JavaScript 21% · 393.4 KiB
Font 5% · 100.4 KiB
CSS 3% · 53.6 KiB
Document 2% · 30.0 KiB
Other 0% · 1.2 KiB

~159.6 KiB of savings available

Remove unused JavaScript: 159.6 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
Page Weight Budget
Action
1.8 MB transferred, 40 requests
REVIEW
1.8 MB transferred, 40 requests
Info::
Page weighs 3.1 MB (1.8 MB transferred)
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Info::
40 HTTP requests
Info::
Estimated 0.38 g CO2 per page load
1.8 MB / 2.4 MB budget
1.8 MB transferred
40 requests
0.38 g CO2 per page load
Images 1.2 MiB 68%
JavaScript 393.4 KiB 21%
Fonts 100.4 KiB 5%
CSS 53.6 KiB 3%
HTML 30.0 KiB 2%
Other 12.5 KiB 1%
Other 548 B 0%
Other 451 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

C
Image Optimization
Action
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Warning::
https://www.upenn.edu/themes/custom/penn_global/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upenn.edu/themes/custom/penn_global/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://penntoday.upenn.edu/sites/default/files/st... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upenn.edu/themes/custom/penn_global/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upenn.edu/themes/custom/penn_starter/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://penntoday.upenn.edu/sites/default/files/st... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upenn.edu/themes/custom/penn_global/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upenn.edu/themes/custom/penn_global/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upenn.edu/themes/custom/penn_global/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upenn.edu/themes/custom/penn_global/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://penntoday.upenn.edu/sites/default/files/st... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upenn.edu/themes/custom/penn_global/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upenn.edu/themes/custom/penn_global/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
20 images 1.2 MB
0 oversized -0 KB
16 legacy format
13 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

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
1652ms total JS execution
REVIEW
1652ms total JS execution
Warning::
https://www.upenn.edu/: 577ms CPU time
Warning::
https://www.upenn.edu/sites/default/files/js/js_D-...: 318ms CPU time
Warning::
Unattributable: 303ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-LL85...: 218ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5X3...: 174ms CPU time
Warning::
Third-party scripts: 1652ms (100% of total)

Main Thread Breakdown

Script Evaluation 35% Style & Layout 26% Other 25% Script Parsing & Compilation 6% Parse HTML & CSS 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.upenn.edu/577ms8ms2ms3rd
https://www.upenn.edu/sites/default/files/js/js_D-zhZ1_IbEPvTFtT74PECVxlOcb5FZQ7HFRn53yQCoI.js?scope=footer&delta=1&language=en&theme=penn_starter&include=eJx9ikEKhTAMBS9k7ZFCTMuzGhtpCurt_wdX3bh5jxkGZtBMnRHxnwkjz7zxPcpjOnOtJHtOpVuLAwVZuSKHBWJq7SslTomux8v1gETZ_a2htrDG94JLK2f3H0rIQYE318ms192ms15ms3rd
Unattributable303ms8ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-LL85393RFV&cx=c&gtm=4e64k0h2218ms178ms38ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5X34LWC174ms139ms33ms3rd
https://www.google-analytics.com/analytics.js62ms49ms4ms3rd
C
JS Bundles
Action
8 scripts, 160 KB unused
REVIEW
8 scripts, 160 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-LL85...: 65 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5X3...: 64 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.upenn.edu/sites/default/files/js/js_D-...: 31 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 160 KB
160 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-LL85393RFV&cx=c&gtm=4e64k0h2152 KB65 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5X34LWC137 KB64 KB (47%)✓3rd
https://www.upenn.edu/sites/default/files/js/js_D-zhZ1_IbEPvTFtT74PECVxlOcb5FZQ7HFRn53yQCoI.js?scope=footer&delta=1&language=en&theme=penn_starter&include=eJx9ikEKhTAMBS9k7ZFCTMuzGhtpCurt_wdX3bh5jxkGZtBMnRHxnwkjz7zxPcpjOnOtJHtOpVuLAwVZuSKHBWJq7SslTomux8v1gETZ_a2htrDG94JLK2f3H0rIQYE50 KB31 KB (62%)✓3rd
https://www.upenn.edu/sites/default/files/js/js_Qb5Hf6mJBtGliJ8jbrJRJyzFCu9df9sxAyB9s7K_fes.js?scope=header&delta=0&language=en&theme=penn_starter&include=eJx9ikEKhTAMBS9k7ZFCTMuzGhtpCurt_wdX3bh5jxkGZtBMnRHxnwkjz7zxPcpjOnOtJHtOpVuLAwVZuSKHBWJq7SslTomux8v1gETZ_a2htrDG94JLK2f3H0rIQYE1 KB—✓3rd
https://www.upenn.edu/modules/contrib/google_tag/js/gtag.js?tduwqx1 KB—✓3rd
https://www.upenn.edu/modules/contrib/google_tag/js/gtm.js?tduwqx1 KB—✓3rd
https://www.upenn.edu/core/assets/vendor/jquery/jquery.min.js?v=4.0.032 KB—✓3rd
https://www.google-analytics.com/analytics.js21 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

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
4 fonts (100 KB)
PASS
4 fonts (100 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

100 KB total

Render-blocking

0

of 4

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 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 3.9 s LCP 8.5 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 55 ms — font-display: swaphttps://fonts.gstatic.com/s/ebgaramond/v32/SlGDmQSNjdsmc35JDF1K5E55YMjF_7DPuGi-6_RkBI9_Wa-XgA.woff2SlGDmQSNjdsmc35JDF1K5E5... https://fonts.gstatic.com/s/ebgaramond/v32/SlGDmQSNjdsmc35JDF1K5E55YMjF_7DPuGi-6_RkBI9_Wa-XgA.woff2 — 21.2 KiB — 52 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnkaSTbQWg.woff2KFO5CnqEu92Fr1Mu53ZEC9_... https://fonts.gstatic.com/s/roboto/v51/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnkaSTbQWg.woff2 — 40.8 KiB — 60 ms — font-display: swaphttps://www.upenn.edu/themes/custom/penn_global/assets/dist/fonts/slick.woffslick.woff https://www.upenn.edu/themes/custom/penn_global/assets/dist/fonts/slick.woff — 1.7 KiB — 127 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 55 ms
Start 209 ms
Risk FOUT — text flashes from fallback to web font
SlGDmQSNjdsmc35JDF1K5E5... woff2 swap
Size 21 KB
Load time 52 ms
Start 213 ms
Risk FOUT — text flashes from fallback to web font
KFO5CnqEu92Fr1Mu53ZEC9_... woff2 swap
Size 41 KB
Load time 60 ms
Start 213 ms
Risk FOUT — text flashes from fallback to web font
slick.woff woff swap
Size 2 KB
Load time 127 ms
Start 303 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~1 KB and ~2 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
40 requests over 592ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 3.9 s LCP 8.5 shttps://upenn.edu// https://upenn.edu/ — 301 — 209 B — 10 ms — h2https://www.upenn.edu/www.upenn.edu/ https://www.upenn.edu/ — 200 — 30.0 KiB — 12 ms — h2https://www.upenn.edu/sites/default/files/css/css_YLWp88qbpiivAKlZryznBSp52SpeG9oTV97FPsQfF6w.css?delta=0&language=en&theme=penn_starter&include=eJwliWsOgzAMxi5UyJFQSj-hTOlDSWDr7Sfgjy3ZezdQsXOwrvzhX0ILibmhZhTaeYT0lgZa2w7tmZVeLR5TpR3v8mALGN0RS79gJgWefHqgUmZHugRfp4dr7eVU_AHTaDCgwww.upenn.edu/sites/default/files/c... https://www.upenn.edu/sites/default/files/css/css_YLWp88qbpiivAKlZryznBSp52SpeG9oTV97FPsQfF6w.css?delta=0&language=en&theme=penn_starter&include=eJwliWsOgzAMxi5UyJFQSj-hTOlDSWDr7Sfgjy3ZezdQsXOwrvzhX0ILibmhZhTaeYT0lgZa2w7tmZVeLR5TpR3v8mALGN0RS79gJgWefHqgUmZHugRfp4dr7eVU_AHTaDCg — 200 — 1.4 KiB — 10 ms — h2https://www.upenn.edu/sites/default/files/css/css_YXG-48C9dItYo_-1cLQAXLW5nY-m7-w6vYlwU5vlvZA.css?delta=1&language=en&theme=penn_starter&include=eJwliWsOgzAMxi5UyJFQSj-hTOlDSWDr7Sfgjy3ZezdQsXOwrvzhX0ILibmhZhTaeYT0lgZa2w7tmZVeLR5TpR3v8mALGN0RS79gJgWefHqgUmZHugRfp4dr7eVU_AHTaDCgwww.upenn.edu/sites/default/files/c... https://www.upenn.edu/sites/default/files/css/css_YXG-48C9dItYo_-1cLQAXLW5nY-m7-w6vYlwU5vlvZA.css?delta=1&language=en&theme=penn_starter&include=eJwliWsOgzAMxi5UyJFQSj-hTOlDSWDr7Sfgjy3ZezdQsXOwrvzhX0ILibmhZhTaeYT0lgZa2w7tmZVeLR5TpR3v8mALGN0RS79gJgWefHqgUmZHugRfp4dr7eVU_AHTaDCg — 200 — 49.7 KiB — 19 ms — h2https://www.upenn.edu/sites/default/files/js/js_Qb5Hf6mJBtGliJ8jbrJRJyzFCu9df9sxAyB9s7K_fes.js?scope=header&delta=0&language=en&theme=penn_starter&include=eJx9ikEKhTAMBS9k7ZFCTMuzGhtpCurt_wdX3bh5jxkGZtBMnRHxnwkjz7zxPcpjOnOtJHtOpVuLAwVZuSKHBWJq7SslTomux8v1gETZ_a2htrDG94JLK2f3H0rIQYEwww.upenn.edu/sites/default/files/j... https://www.upenn.edu/sites/default/files/js/js_Qb5Hf6mJBtGliJ8jbrJRJyzFCu9df9sxAyB9s7K_fes.js?scope=header&delta=0&language=en&theme=penn_starter&include=eJx9ikEKhTAMBS9k7ZFCTMuzGhtpCurt_wdX3bh5jxkGZtBMnRHxnwkjz7zxPcpjOnOtJHtOpVuLAwVZuSKHBWJq7SslTomux8v1gETZ_a2htrDG94JLK2f3H0rIQYE — 200 — 584 B — 7 ms — h2https://www.upenn.edu/modules/contrib/google_tag/js/gtag.js?tduwqxwww.upenn.edu/modules/contrib/googl... https://www.upenn.edu/modules/contrib/google_tag/js/gtag.js?tduwqx — 200 — 922 B — 13 ms — h2https://www.upenn.edu/modules/contrib/google_tag/js/gtm.js?tduwqxwww.upenn.edu/modules/contrib/googl... https://www.upenn.edu/modules/contrib/google_tag/js/gtm.js?tduwqx — 200 — 965 B — 16 ms — h2https://fonts.googleapis.com/css?family=EB+Garamond|Roboto:400,400i,500,700,700i&display=swapfonts.googleapis.com/css?family=EB+... https://fonts.googleapis.com/css?family=EB+Garamond|Roboto:400,400i,500,700,700i&display=swap — 200 — 2.5 KiB — 96 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/hero/public/2026-04/Bennett-Maguire-2026-main.jpg?h=12f97b7a&itok=-QoHHDIqpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/hero/public/2026-04/Bennett-Maguire-2026-main.jpg?h=12f97b7a&itok=-QoHHDIq — 200 — 687.1 KiB — 80 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/img/transparent.pngwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/img/transparent.png — 200 — 642 B — 10 ms — h2https://www.upenn.edu/core/assets/vendor/jquery/jquery.min.js?v=4.0.0www.upenn.edu/core/assets/vendor/jq... https://www.upenn.edu/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 — 200 — 31.6 KiB — 7 ms — 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h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=577008680&t=pageview&_s=1&dl=https%3A%2F%2Fwww.upenn.edu%2F&ul=en-us&dt=University%20of%20Pennsylvania&sr=412x823&vp=412x823&_u=YADAAEABAAAAACAAI~&jid=1324985800&gjid=2130643730&cid=550157865.1776797554&tid=UA-78054-1&_gid=931883026.1776797554&_r=1&_slc=1&gtm=45He64k0h2n815X34LWCv851775425za200zd851775425&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400~118463262&npa=1&z=1988087314www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=577008680&t=pageview&_s=1&dl=https%3A%2F%2Fwww.upenn.edu%2F&ul=en-us&dt=University%20of%20Pennsylvania&sr=412x823&vp=412x823&_u=YADAAEABAAAAACAAI~&jid=1324985800&gjid=2130643730&cid=550157865.1776797554&tid=UA-78054-1&_gid=931883026.1776797554&_r=1&_slc=1&gtm=45He64k0h2n815X34LWCv851775425za200zd851775425&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400~118463262&npa=1&z=1988087314 — 200 — 451 B — 24 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/img/simplified-shield.icowww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/img/simplified-shield.ico — 200 — 12.3 KiB — 8 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 1652ms · 389KB · €18/mo
www.upenn.edu
Other
Costly
Execution 577ms
Transfer 30 KB
Monthly Cost €6/mo
www.upenn.edu
Other
Costly
Execution 318ms
Transfer 50 KB
Unused 62%
Monthly Cost €3/mo
Unattributable
Other
Costly
Execution 303ms
Transfer 0 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 218ms
Transfer 152 KB
Unused 43%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 174ms
Transfer 137 KB
Unused 47%
Monthly Cost €2/mo
Google Analytics
Analytics
Optional
Execution 62ms
Transfer 21 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.upenn.edu adds 577ms and costs ~€6/month
  • www.upenn.edu adds 318ms and costs ~€3/month
  • Unattributable adds 303ms and costs ~€3/month
  • Google Tag Manager adds 218ms and costs ~€2/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.upenn.edu takes 577ms 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.upenn.edu takes 318ms 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

62% of www.upenn.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 303ms 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 218ms 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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