Skip to content
https://upenn.edu

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
89
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.

1.03 s

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

1.99 s

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

6 ms

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

0.005

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

1.03 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.

2.01 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
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
6.3 MB transferred, 87 requests
FIX
6.3 MB transferred, 87 requests
Critical::
Page weighs 7.6 MB (6.3 MB transferred)
Warning::
Images are 5.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.7 MB
Info::
87 HTTP requests
Info::
Estimated 1.3 g CO2 per page load
6.3 MB / 2.4 MB budget
6.3 MB transferred
87 requests
1.3 g CO2 per page load
Images 5.7 MiB 91%
JavaScript 393.8 KiB 6%
Fonts 100.4 KiB 2%
CSS 53.6 KiB 1%
HTML 30.1 KiB 0%
Other 12.6 KiB 0%
Other 548 B 0%
Other 451 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

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 (6.3 MiB of 6.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
87 resources · 6.3 MB · 155 KB savings available
FIX
87 resources · 6.3 MB · 155 KB savings available
Warning::
Page weight 5.3 MB over 1MB target
Got: 6.3 MB Expected: ≤ 1 MB
Info::
~155 KB of savings available
Warning::
86 third-party resources (100% of weight)
Info::
1 resources over 200KB
87 resources · 6.3 MiB · 86 third-party 5.3 MiB over 1MB target
Image 91% · 5.8 MiB
JavaScript 6% · 393.8 KiB
Font 2% · 100.4 KiB
CSS 1% · 53.6 KiB
Document 0% · 30.1 KiB
Other 0% · 1.2 KiB

~155.1 KiB of savings available

Remove unused JavaScript: 155.1 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
67 images, 0 KB saveable
REVIEW
67 images, 0 KB saveable
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://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://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://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://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://penntoday.upenn.edu/sites/default/files/st... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
67 images 5.7 MB
0 oversized -0 KB
63 legacy format
16 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

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 Bundles
Action
8 scripts, 155 KB unused
REVIEW
8 scripts, 155 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-LL85...: 63 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5X3...: 62 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.upenn.edu/sites/default/files/js/js_D-...: 30 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 155 KB
155 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-LL85393RFV&cx=c&gtm=4e64h1152 KB63 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5X34LWC137 KB62 KB (45%)✓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 KB30 KB (61%)✓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+
JS Execution Cost
496ms total JS execution
PASS
496ms total JS execution
Info::
Unattributable: 151ms CPU time
Info::
https://www.upenn.edu/: 143ms CPU time
Info::
https://www.upenn.edu/sites/default/files/js/js_D-...: 85ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-LL85...: 64ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5X3...: 53ms CPU time
Warning::
Third-party scripts: 496ms (100% of total)

Main Thread Breakdown

Other 33% Script Evaluation 31% Style & Layout 25% Script Parsing & Compilation 6% Rendering 3%
ScriptTotalScriptingParse/CompileParty
Unattributable151ms2ms0ms3rd
https://www.upenn.edu/143ms2ms0ms3rd
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_a2htrDG94JLK2f3H0rIQYE85ms45ms4ms3rd
https://www.googletagmanager.com/gtag/js?id=G-LL85393RFV&cx=c&gtm=4e64h164ms53ms10ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5X34LWC53ms44ms9ms3rd
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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.0 s LCP 2.0 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 62 ms — font-display: swaphttps://fonts.gstatic.com/s/ebgaramond/v32/SlGDmQSNjdsmc35JDF1K5E55YMjF_7DPuGi-6_RkBI9_WamXgHlI.woff2SlGDmQSNjdsmc35JDF1K5E5... https://fonts.gstatic.com/s/ebgaramond/v32/SlGDmQSNjdsmc35JDF1K5E55YMjF_7DPuGi-6_RkBI9_WamXgHlI.woff2 — 21.2 KiB — 56 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 — 66 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 — 7 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 62 ms
Start 219 ms
Risk FOUT — text flashes from fallback to web font
SlGDmQSNjdsmc35JDF1K5E5... woff2 swap
Size 21 KB
Load time 56 ms
Start 220 ms
Risk FOUT — text flashes from fallback to web font
KFO5CnqEu92Fr1Mu53ZEC9_... woff2 swap
Size 41 KB
Load time 66 ms
Start 220 ms
Risk FOUT — text flashes from fallback to web font
slick.woff woff swap
Size 2 KB
Load time 7 ms
Start 399 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)
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
87 requests over 656ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.0 s LCP 2.0 shttps://upenn.edu// https://upenn.edu/ — 301 — 208 B — 7 ms — h2https://www.upenn.edu/www.upenn.edu/ https://www.upenn.edu/ — 200 — 30.1 KiB — 8 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 — 21 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 — 26 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 — 536 B — 13 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 — 987 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 — 899 B — 21 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 — 92 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 — 64 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/daniell-gum-NL.jpg?h=3e43625b&itok=vq52AE0Lpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/daniell-gum-NL.jpg?h=3e43625b&itok=vq52AE0L — 200 — 84.2 KiB — 25 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/icebergs-sas-teaser-NL.jpg?h=56d0ca2e&itok=oET8OQVEpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/icebergs-sas-teaser-NL.jpg?h=56d0ca2e&itok=oET8OQVE — 200 — 105.2 KiB — 40 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/kidney-genetics-teaser-NL.jpg?h=56d0ca2e&itok=jAMYOwSFpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/kidney-genetics-teaser-NL.jpg?h=56d0ca2e&itok=jAMYOwSF — 200 — 130.5 KiB — 56 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/IMG_1995a.jpg?h=56d0ca2e&itok=yxAkG8wUpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/IMG_1995a.jpg?h=56d0ca2e&itok=yxAkG8wU — 200 — 68.8 KiB — 56 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 — 32 ms — h2https://www.upenn.edu/sites/default/files/js/js_D-zhZ1_IbEPvTFtT74PECVxlOcb5FZQ7HFRn53yQCoI.js?scope=footer&delta=1&language=en&theme=penn_starter&include=eJx9ikEKhTAMBS9k7ZFCTMuzGhtpCurt_wdX3bh5jxkGZtBMnRHxnwkjz7zxPcpjOnOtJHtOpVuLAwVZuSKHBWJq7SslTomux8v1gETZ_a2htrDG94JLK2f3H0rIQYEwww.upenn.edu/sites/default/files/j... 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_a2htrDG94JLK2f3H0rIQYE — 200 — 50.0 KiB — 38 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/performing-arts-photo-essay-teaser.jpg?h=56d0ca2e&itok=QZKsGe8Fpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/performing-arts-photo-essay-teaser.jpg?h=56d0ca2e&itok=QZKsGe8F — 200 — 72.1 KiB — 73 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/liu-ani-teaser.jpg?h=c863be35&itok=gL_O6Ayzpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/liu-ani-teaser.jpg?h=c863be35&itok=gL_O6Ayz — 200 — 88.2 KiB — 59 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/Steve-Weitzman-Q%26A-Katz-teaser.jpg?h=56d0ca2e&itok=ZUnhBtjrpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/Steve-Weitzman-Q%26A-Katz-teaser.jpg?h=56d0ca2e&itok=ZUnhBtjr — 200 — 94.5 KiB — 55 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/sidegigs-podcast-teaser.jpg?h=56d0ca2e&itok=sk8F-xU_penntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/sidegigs-podcast-teaser.jpg?h=56d0ca2e&itok=sk8F-xU_ — 200 — 134.0 KiB — 74 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/P-101884-Master-V1-002.jpg?h=3d32bcad&itok=6yHPtMmQpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/P-101884-Master-V1-002.jpg?h=3d32bcad&itok=6yHPtMmQ — 200 — 105.5 KiB — 75 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/P-102114-Master-V1-048.jpg?h=56d0ca2e&itok=oxp119uNpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/P-102114-Master-V1-048.jpg?h=56d0ca2e&itok=oxp119uN — 200 — 81.8 KiB — 77 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/centola-award-teaser.jpg?h=56d0ca2e&itok=xzCv6i9_penntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/centola-award-teaser.jpg?h=56d0ca2e&itok=xzCv6i9_ — 200 — 72.6 KiB — 112 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/baker-megan-teaser.jpg?h=56d0ca2e&itok=A0DvUt3kpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/baker-megan-teaser.jpg?h=56d0ca2e&itok=A0DvUt3k — 200 — 88.9 KiB — 114 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/inter-minds-teaser-NL-1.jpg?h=56d0ca2e&itok=SsQ5YIiApenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/inter-minds-teaser-NL-1.jpg?h=56d0ca2e&itok=SsQ5YIiA — 200 — 72.2 KiB — 112 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/hu-nature-teaser-NL.jpg?h=2d90a612&itok=LT7usUVYpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/hu-nature-teaser-NL.jpg?h=2d90a612&itok=LT7usUVY — 200 — 43.9 KiB — 112 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/Untitled%20design%20%282%29.jpg?h=c5328b07&itok=eWyI_X4Apenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/Untitled%20design%20%282%29.jpg?h=c5328b07&itok=eWyI_X4A — 200 — 44.6 KiB — 113 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/csslab-media-bias-watts-teaser.jpg?h=56d0ca2e&itok=KuqxWMyUpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/csslab-media-bias-watts-teaser.jpg?h=56d0ca2e&itok=KuqxWMyU — 200 — 104.8 KiB — 116 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/tv-law-teaser-NL.jpg?h=56d0ca2e&itok=9iWzNFxTpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/tv-law-teaser-NL.jpg?h=56d0ca2e&itok=9iWzNFxT — 200 — 97.6 KiB — 117 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/Private%20credit%20-%20teaser%20-nl.jpeg?h=56d0ca2e&itok=w8t6iGEFpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/Private%20credit%20-%20teaser%20-nl.jpeg?h=56d0ca2e&itok=w8t6iGEF — 200 — 95.2 KiB — 119 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/P-102106-Master-V1-021.jpg?h=56d0ca2e&itok=z-VstDtVpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/P-102106-Master-V1-021.jpg?h=56d0ca2e&itok=z-VstDtV — 200 — 79.2 KiB — 120 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.0 s LCP 2.0 shttps://upenn.edu// https://upenn.edu/ — 301 — 208 B — 7 ms — h2https://www.upenn.edu/www.upenn.edu/ https://www.upenn.edu/ — 200 — 30.1 KiB — 8 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 — 21 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 — 26 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 — 536 B — 13 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 — 987 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 — 899 B — 21 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 — 92 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 — 64 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/daniell-gum-NL.jpg?h=3e43625b&itok=vq52AE0Lpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/daniell-gum-NL.jpg?h=3e43625b&itok=vq52AE0L — 200 — 84.2 KiB — 25 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/icebergs-sas-teaser-NL.jpg?h=56d0ca2e&itok=oET8OQVEpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/icebergs-sas-teaser-NL.jpg?h=56d0ca2e&itok=oET8OQVE — 200 — 105.2 KiB — 40 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/kidney-genetics-teaser-NL.jpg?h=56d0ca2e&itok=jAMYOwSFpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/kidney-genetics-teaser-NL.jpg?h=56d0ca2e&itok=jAMYOwSF — 200 — 130.5 KiB — 56 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/IMG_1995a.jpg?h=56d0ca2e&itok=yxAkG8wUpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/IMG_1995a.jpg?h=56d0ca2e&itok=yxAkG8wU — 200 — 68.8 KiB — 56 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 — 32 ms — h2https://www.upenn.edu/sites/default/files/js/js_D-zhZ1_IbEPvTFtT74PECVxlOcb5FZQ7HFRn53yQCoI.js?scope=footer&delta=1&language=en&theme=penn_starter&include=eJx9ikEKhTAMBS9k7ZFCTMuzGhtpCurt_wdX3bh5jxkGZtBMnRHxnwkjz7zxPcpjOnOtJHtOpVuLAwVZuSKHBWJq7SslTomux8v1gETZ_a2htrDG94JLK2f3H0rIQYEwww.upenn.edu/sites/default/files/j... 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_a2htrDG94JLK2f3H0rIQYE — 200 — 50.0 KiB — 38 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/performing-arts-photo-essay-teaser.jpg?h=56d0ca2e&itok=QZKsGe8Fpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/performing-arts-photo-essay-teaser.jpg?h=56d0ca2e&itok=QZKsGe8F — 200 — 72.1 KiB — 73 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/liu-ani-teaser.jpg?h=c863be35&itok=gL_O6Ayzpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/liu-ani-teaser.jpg?h=c863be35&itok=gL_O6Ayz — 200 — 88.2 KiB — 59 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/Steve-Weitzman-Q%26A-Katz-teaser.jpg?h=56d0ca2e&itok=ZUnhBtjrpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/Steve-Weitzman-Q%26A-Katz-teaser.jpg?h=56d0ca2e&itok=ZUnhBtjr — 200 — 94.5 KiB — 55 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/sidegigs-podcast-teaser.jpg?h=56d0ca2e&itok=sk8F-xU_penntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/sidegigs-podcast-teaser.jpg?h=56d0ca2e&itok=sk8F-xU_ — 200 — 134.0 KiB — 74 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/P-101884-Master-V1-002.jpg?h=3d32bcad&itok=6yHPtMmQpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/P-101884-Master-V1-002.jpg?h=3d32bcad&itok=6yHPtMmQ — 200 — 105.5 KiB — 75 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/P-102114-Master-V1-048.jpg?h=56d0ca2e&itok=oxp119uNpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/P-102114-Master-V1-048.jpg?h=56d0ca2e&itok=oxp119uN — 200 — 81.8 KiB — 77 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/centola-award-teaser.jpg?h=56d0ca2e&itok=xzCv6i9_penntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/centola-award-teaser.jpg?h=56d0ca2e&itok=xzCv6i9_ — 200 — 72.6 KiB — 112 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/baker-megan-teaser.jpg?h=56d0ca2e&itok=A0DvUt3kpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/baker-megan-teaser.jpg?h=56d0ca2e&itok=A0DvUt3k — 200 — 88.9 KiB — 114 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/inter-minds-teaser-NL-1.jpg?h=56d0ca2e&itok=SsQ5YIiApenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/inter-minds-teaser-NL-1.jpg?h=56d0ca2e&itok=SsQ5YIiA — 200 — 72.2 KiB — 112 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/hu-nature-teaser-NL.jpg?h=2d90a612&itok=LT7usUVYpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/hu-nature-teaser-NL.jpg?h=2d90a612&itok=LT7usUVY — 200 — 43.9 KiB — 112 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/Untitled%20design%20%282%29.jpg?h=c5328b07&itok=eWyI_X4Apenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/Untitled%20design%20%282%29.jpg?h=c5328b07&itok=eWyI_X4A — 200 — 44.6 KiB — 113 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/csslab-media-bias-watts-teaser.jpg?h=56d0ca2e&itok=KuqxWMyUpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/csslab-media-bias-watts-teaser.jpg?h=56d0ca2e&itok=KuqxWMyU — 200 — 104.8 KiB — 116 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/tv-law-teaser-NL.jpg?h=56d0ca2e&itok=9iWzNFxTpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/tv-law-teaser-NL.jpg?h=56d0ca2e&itok=9iWzNFxT — 200 — 97.6 KiB — 117 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/Private%20credit%20-%20teaser%20-nl.jpeg?h=56d0ca2e&itok=w8t6iGEFpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/Private%20credit%20-%20teaser%20-nl.jpeg?h=56d0ca2e&itok=w8t6iGEF — 200 — 95.2 KiB — 119 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/P-102106-Master-V1-021.jpg?h=56d0ca2e&itok=z-VstDtVpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/P-102106-Master-V1-021.jpg?h=56d0ca2e&itok=z-VstDtV — 200 — 79.2 KiB — 120 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/Early_America_Economy_Boston_MainTeaser.jpg?h=56d0ca2e&itok=VWGQgw73penntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/Early_America_Economy_Boston_MainTeaser.jpg?h=56d0ca2e&itok=VWGQgw73 — 200 — 93.5 KiB — 120 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/ripple-effect-february-teaser.jpg?h=56d0ca2e&itok=SChTtoFXpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/ripple-effect-february-teaser.jpg?h=56d0ca2e&itok=SChTtoFX — 200 — 80.8 KiB — 120 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/Penn%20Matters%20-%20Allison%20Hoffman%20-%20Thumbnail.jpg?h=56d0ca2e&itok=phcCVM3Openntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/Penn%20Matters%20-%20Allison%20Hoffman%20-%20Thumbnail.jpg?h=56d0ca2e&itok=phcCVM3O — 200 — 74.8 KiB — 123 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/02Physics.png?h=43be4335&itok=WEt1F7FIpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/02Physics.png?h=43be4335&itok=WEt1F7FI — 200 — 120.5 KiB — 126 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/artemis-teaser-NL.jpg?h=56d0ca2e&itok=b2h9guyGpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/artemis-teaser-NL.jpg?h=56d0ca2e&itok=b2h9guyG — 200 — 106.5 KiB — 128 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/P-102141-Master-V1-003%20%281%29.jpg?h=56d0ca2e&itok=hRT0jz7dpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/P-102141-Master-V1-003%20%281%29.jpg?h=56d0ca2e&itok=hRT0jz7d — 200 — 45.4 KiB — 122 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/Shujie%20Yang-teaser.jpg?h=56d0ca2e&itok=8073MIknpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/Shujie%20Yang-teaser.jpg?h=56d0ca2e&itok=8073MIkn — 200 — 62.7 KiB — 126 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/lipid-nanoparticle-roundup-NL-teaser.jpg?h=199d8c1f&itok=2nPsy_eVpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/lipid-nanoparticle-roundup-NL-teaser.jpg?h=199d8c1f&itok=2nPsy_eV — 200 — 88.8 KiB — 128 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/ai-swarm-teaser-NL.jpg?h=199d8c1f&itok=5L6_vACDpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/ai-swarm-teaser-NL.jpg?h=199d8c1f&itok=5L6_vACD — 200 — 70.0 KiB — 127 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/Rene%20Vidal%20Penn%20Matters%20Thumbnail.jpg?h=56d0ca2e&itok=IZ4exqvnpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/Rene%20Vidal%20Penn%20Matters%20Thumbnail.jpg?h=56d0ca2e&itok=IZ4exqvn — 200 — 60.3 KiB — 126 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/IMG_2017.jpg?h=56d0ca2e&itok=dJCLseTapenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/IMG_2017.jpg?h=56d0ca2e&itok=dJCLseTa — 200 — 118.3 KiB — 129 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/robots-ai-teaser.jpg?h=10d202d3&itok=oSxRJRHLpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/robots-ai-teaser.jpg?h=10d202d3&itok=oSxRJRHL — 200 — 113.9 KiB — 131 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/gao-lab-cf-teaser.jpg?h=10d202d3&itok=84yR1X2ypenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/gao-lab-cf-teaser.jpg?h=10d202d3&itok=84yR1X2y — 200 — 92.5 KiB — 131 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/hotkeys-embed-1.jpg?h=42be32f9&itok=ecB6hwWCpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/hotkeys-embed-1.jpg?h=42be32f9&itok=ecB6hwWC — 200 — 93.7 KiB — 159 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/Bennett-Maguire-2026-main.jpg?h=12f97b7a&itok=6eNuD7Rkpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/Bennett-Maguire-2026-main.jpg?h=12f97b7a&itok=6eNuD7Rk — 200 — 103.9 KiB — 131 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/rna-inst-seas-teaser-NL.jpg?h=cea7ad1f&itok=R7MubdWQpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/rna-inst-seas-teaser-NL.jpg?h=cea7ad1f&itok=R7MubdWQ — 200 — 112.4 KiB — 132 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/the-pitt-scene.jpg?h=c1e51c98&itok=kM24l0-kpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/the-pitt-scene.jpg?h=c1e51c98&itok=kM24l0-k — 200 — 94.7 KiB — 133 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/P-102101-Master-V1-039.JPG?h=9855f42d&itok=56PvDrR-penntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/P-102101-Master-V1-039.JPG?h=9855f42d&itok=56PvDrR- — 200 — 153.8 KiB — 174 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/P-101859-Master-V1-073.jpg?h=56d0ca2e&itok=WzTYNTObpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/P-101859-Master-V1-073.jpg?h=56d0ca2e&itok=WzTYNTOb — 200 — 166.9 KiB — 137 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/pip-pep-psp-2026-teaser-NL.jpg?h=56d0ca2e&itok=tbfhLnGvpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/pip-pep-psp-2026-teaser-NL.jpg?h=56d0ca2e&itok=tbfhLnGv — 200 — 69.4 KiB — 141 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/reidinger-cole-rowing-NL.jpg?h=56d0ca2e&itok=qFbi6Oebpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/reidinger-cole-rowing-NL.jpg?h=56d0ca2e&itok=qFbi6Oeb — 200 — 118.8 KiB — 145 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/PDSorosFellow_BayanGalal_Main.jpg?h=56d0ca2e&itok=-nf86IwXpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/PDSorosFellow_BayanGalal_Main.jpg?h=56d0ca2e&itok=-nf86IwX — 200 — 78.1 KiB — 145 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/P-100909-Master-V1-016.jpg?h=56d0ca2e&itok=V9JxWdxmpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/P-100909-Master-V1-016.jpg?h=56d0ca2e&itok=V9JxWdxm — 200 — 135.4 KiB — 152 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/pwh-geneva-teaser-NL%20-%20Edited.jpg?h=99b95e68&itok=liQHDx4Qpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-04/pwh-geneva-teaser-NL%20-%20Edited.jpg?h=99b95e68&itok=liQHDx4Q — 200 — 100.3 KiB — 152 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/livs-lauder-teaser.jpg?h=4997dc06&itok=-WRI3wuZpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/livs-lauder-teaser.jpg?h=4997dc06&itok=-WRI3wuZ — 200 — 118.3 KiB — 158 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/iran-war-teaser_1.jpg?h=56d0ca2e&itok=tIPd2dBwpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-03/iran-war-teaser_1.jpg?h=56d0ca2e&itok=tIPd2dBw — 200 — 154.2 KiB — 163 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/Alna%20Farms%20group%20picture%20in%20front%20of%20borehole%20drilling%20machine.jpeg?h=9c4c0580&itok=59BKtJehpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/Alna%20Farms%20group%20picture%20in%20front%20of%20borehole%20drilling%20machine.jpeg?h=9c4c0580&itok=59BKtJeh — 200 — 124.1 KiB — 178 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/japan-election-pwh-teaser.jpg?h=56d0ca2e&itok=wmziLRnVpenntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/japan-election-pwh-teaser.jpg?h=56d0ca2e&itok=wmziLRnV — 200 — 132.2 KiB — 169 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/Prithvi-Parthasarathy-teaser.jpg?h=56d0ca2e&itok=pY1tJ4o7penntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/teaser/public/2026-02/Prithvi-Parthasarathy-teaser.jpg?h=56d0ca2e&itok=pY1tJ4o7 — 200 — 75.0 KiB — 170 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/event_large/public/2018-05/iStock-663971434.jpg?h=119335f7&itok=2MEoMNW0penntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/event_large/public/2018-05/iStock-663971434.jpg?h=119335f7&itok=2MEoMNW0 — 200 — 146.1 KiB — 179 ms — h2https://penntoday.upenn.edu/sites/default/files/styles/event_large/public/2020-12/iStock-1177184973.jpg?h=c03848df&itok=AK1jnA90penntoday.upenn.edu/sites/default/f... https://penntoday.upenn.edu/sites/default/files/styles/event_large/public/2020-12/iStock-1177184973.jpg?h=c03848df&itok=AK1jnA90 — 200 — 104.2 KiB — 178 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-instagram-white.svgwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-instagram-white.svg — 200 — 1.3 KiB — 20 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-threads-white.svgwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-threads-white.svg — 200 — 1.3 KiB — 15 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-instagram.svgwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-instagram.svg — 200 — 1.3 KiB — 14 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-facebook.svgwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-facebook.svg — 200 — 960 B — 20 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-5X34LWCwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-5X34LWC — 200 — 137.2 KiB — 199 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-threads.svgwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-threads.svg — 200 — 1.1 KiB — 12 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-flickr.svgwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-flickr.svg — 200 — 694 B — 14 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-youtube.svgwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-youtube.svg — 200 — 767 B — 9 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-linkedin.svgwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-linkedin.svg — 200 — 847 B — 15 ms — h2https://www.upenn.edu/themes/custom/penn_starter/assets/img/UPenn-logo.svgwww.upenn.edu/themes/custom/penn_st... https://www.upenn.edu/themes/custom/penn_starter/assets/img/UPenn-logo.svg — 200 — 7.9 KiB — 16 ms — h2https://www.upenn.edu/sites/default/files/styles/crop_5x3/public/2026-04/performing-arts-one-acts-014.jpg?h=11b60bf6&itok=GnWP0qlLwww.upenn.edu/sites/default/files/s... https://www.upenn.edu/sites/default/files/styles/crop_5x3/public/2026-04/performing-arts-one-acts-014.jpg?h=11b60bf6&itok=GnWP0qlL — 200 — 27.9 KiB — 18 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-down-triangle.svgwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-down-triangle.svg — 200 — 794 B — 19 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/img/blue-pattern-bg.pngwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/img/blue-pattern-bg.png — 200 — 18.1 KiB — 18 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/img//footer-16.pngwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/img//footer-16.png — 200 — 191.1 KiB — 20 ms — h2https://www.upenn.edu/sites/default/files/styles/crop_2x1/public/2026-04/thermal-arch-lab.jpg?h=3387a451&itok=CQBOyr6Twww.upenn.edu/sites/default/files/s... https://www.upenn.edu/sites/default/files/styles/crop_2x1/public/2026-04/thermal-arch-lab.jpg?h=3387a451&itok=CQBOyr6T — 200 — 65.7 KiB — 9 ms — h2https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2fonts.gstatic.com/s/roboto/v51/KFO7... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 200 — 36.7 KiB — 62 ms — h3https://fonts.gstatic.com/s/ebgaramond/v32/SlGDmQSNjdsmc35JDF1K5E55YMjF_7DPuGi-6_RkBI9_WamXgHlI.woff2fonts.gstatic.com/s/ebgaramond/v32/... https://fonts.gstatic.com/s/ebgaramond/v32/SlGDmQSNjdsmc35JDF1K5E55YMjF_7DPuGi-6_RkBI9_WamXgHlI.woff2 — 200 — 21.2 KiB — 56 ms — h3https://fonts.gstatic.com/s/roboto/v51/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnkaSTbQWg.woff2fonts.gstatic.com/s/roboto/v51/KFO5... https://fonts.gstatic.com/s/roboto/v51/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnkaSTbQWg.woff2 — 200 — 40.8 KiB — 66 ms — h3https://www.upenn.edu/themes/custom/penn_global/assets/dist/ajax-loader.gifwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/dist/ajax-loader.gif — 200 — 4.5 KiB — 5 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-priority-arrow.svgwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-priority-arrow.svg — 200 — 740 B — 8 ms — h2https://www.upenn.edu/themes/custom/penn_global/assets/dist/fonts/slick.woffwww.upenn.edu/themes/custom/penn_gl... https://www.upenn.edu/themes/custom/penn_global/assets/dist/fonts/slick.woff — 200 — 1.7 KiB — 7 ms — h2https://www.googletagmanager.com/gtag/js?id=G-LL85393RFV&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-LL85393RFV&cx=c&gtm=4e64h1 — 200 — 151.6 KiB — 51 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 64 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-LL85393RFV&gtm=45je64h1v892157916z8851775425za20gzb851775425zd851775425&_p=1776797567541&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=220414813.1776797568&frm=0&pscdl=noapi&rcb=12&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938469~117266401&sid=1776797568&sct=1&seg=0&dl=https%3A%2F%2Fwww.upenn.edu%2F&dt=University%20of%20Pennsylvania&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=590region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-LL85393RFV&gtm=45je64h1v892157916z8851775425za20gzb851775425zd851775425&_p=1776797567541&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=220414813.1776797568&frm=0&pscdl=noapi&rcb=12&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938469~117266401&sid=1776797568&sct=1&seg=0&dl=https%3A%2F%2Fwww.upenn.edu%2F&dt=University%20of%20Pennsylvania&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=590 — 204 — 548 B — 65 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1714843806&t=pageview&_s=1&dl=https%3A%2F%2Fwww.upenn.edu%2F&ul=en-us&dt=University%20of%20Pennsylvania&sr=800x600&vp=1350x940&_u=YADAAEABAAAAACAAI~&jid=622879695&gjid=368922541&cid=220414813.1776797568&tid=UA-78054-1&_gid=722399838.1776797568&_r=1&_slc=1&gtm=45He64h1n815X34LWCv851775425za200zd851775425&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266400&npa=1&z=1303843970www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1714843806&t=pageview&_s=1&dl=https%3A%2F%2Fwww.upenn.edu%2F&ul=en-us&dt=University%20of%20Pennsylvania&sr=800x600&vp=1350x940&_u=YADAAEABAAAAACAAI~&jid=622879695&gjid=368922541&cid=220414813.1776797568&tid=UA-78054-1&_gid=722399838.1776797568&_r=1&_slc=1&gtm=45He64h1n815X34LWCv851775425za200zd851775425&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266400&npa=1&z=1303843970 — 200 — 451 B — 25 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 — 7 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 496ms · 369KB · €5/mo
Unattributable
Other
Optional
Execution 151ms
Transfer 0 KB
Monthly Cost €2/mo
www.upenn.edu
Other
Optional
Execution 143ms
Transfer 30 KB
Monthly Cost €2/mo
www.upenn.edu
Other
Optional
Execution 85ms
Transfer 50 KB
Unused 61%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 64ms
Transfer 152 KB
Unused 41%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 53ms
Transfer 137 KB
Unused 45%
Monthly Cost €1/mo

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

61% 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

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.

Send Feedback