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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
35
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.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

9.80 s

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

20.03 s

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

935 ms

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

0.043

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

9.80 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.

20.35 s

Page Load Progression

513 ms
1.0 s
1.5 s
2.1 s
2.6 s
3.1 s
3.6 s
4.1 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
8.6 MB transferred, 57 requests
FIX
8.6 MB transferred, 57 requests
Critical::
Page weighs 14.5 MB (8.6 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
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::
CSS is 214 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 214 KB
Info::
57 HTTP requests
Info::
Estimated 1.8 g CO2 per page load
8.6 MB / 2.4 MB budget
8.6 MB transferred
57 requests
1.8 g CO2 per page load
Other 5.3 MiB 62%
JavaScript 1.5 MiB 18%
Images 1.2 MiB 15%
CSS 214.2 KiB 2%
Fonts 121.0 KiB 1%
HTML 97.7 KiB 1%
Other 7.8 KiB 0%
Other 2.1 KiB 0%
Other 949 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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 (8.6 MiB of 8.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4172ms total JS execution
FIX
4172ms total JS execution
Warning::
https://www.swarthmore.edu/sites/default/files/js/...: 1285ms CPU time
Warning::
https://www.swarthmore.edu/: 1104ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-LTWL...: 531ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-M8X...: 508ms CPU time
Warning::
Unattributable: 444ms CPU time
Warning::
Third-party scripts: 4172ms (100% of total)

Main Thread Breakdown

Script Evaluation 42% Other 28% Style & Layout 16% Script Parsing & Compilation 6% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.swarthmore.edu/sites/default/files/js/js_fWKh1eMp9sgrPnNXPtIuZLSCULDTl14zm1SSFM-le64.js?scope=footer&delta=0&language=en&theme=swarthmore&include=eJxLz89Pz0mNL0lM108HEjrpqHy9xKzEClTBXJ3i8sSikozc_KJU_fSc_KTEHCSR-MTkxJz8dP3i5KLMghIAvXgkqA1285ms791ms52ms3rd
https://www.swarthmore.edu/1104ms10ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-LTWLTXJTKP&cx=c&gtm=4e64k1531ms424ms104ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M8XQCCG508ms404ms85ms3rd
Unattributable444ms8ms0ms3rd
https://player.vimeo.com/api/player.js153ms95ms6ms3rd
https://www.swarthmore.edu/sites/default/files/css/css_nRToGU55zYfMKlADeYgEJUDcPhZ0VGt9T8yQFKNsxFo.css?delta=1&language=en&theme=swarthmore&include=eJxFy0sKwCAMRdENia7pWYNaYg2J9rP70kLp5A4O3KUrhaRTwB4rTidQZIUU-_gXPzeZkasVSs4O6Cjt-TP3CHZ22aAWIozcXumw8Na3nibTDafxKYU147ms0ms0ms3rd
D
Page Weight Inventory
Action
57 resources · 8.6 MB · 215 KB savings available
FIX
57 resources · 8.6 MB · 215 KB savings available
Warning::
Page weight 7.6 MB over 1MB target
Got: 8.6 MB Expected: ≤ 1 MB
Info::
~215 KB of savings available
Warning::
56 third-party resources (100% of weight)
Info::
9 resources over 200KB
57 resources · 8.6 MiB · 56 third-party 7.6 MiB over 1MB target
Media 62% · 5.3 MiB
JavaScript 18% · 1.5 MiB
Image 15% · 1.3 MiB
CSS 2% · 214.2 KiB
Font 1% · 121.0 KiB
Document 1% · 97.7 KiB
Other 0% · 17.1 KiB

~215.4 KiB of savings available

Remove unused JavaScript: 215.4 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.

B
Image Optimization
12 images, 0 KB saveable
REVIEW
12 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
12 images 1.2 MB
0 oversized -0 KB
4 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

C
JS Bundles
Action
18 scripts, 215 KB unused
REVIEW
18 scripts, 215 KB unused
Warning::
https://www.swarthmore.edu/sites/default/files/js/...: 81 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-M8X...: 68 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-LTWL...: 66 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 215 KB
215 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.swarthmore.edu/sites/default/files/js/js_fWKh1eMp9sgrPnNXPtIuZLSCULDTl14zm1SSFM-le64.js?scope=footer&delta=0&language=en&theme=swarthmore&include=eJxLz89Pz0mNL0lM108HEjrpqHy9xKzEClTBXJ3i8sSikozc_KJU_fSc_KTEHCSR-MTkxJz8dP3i5KLMghIAvXgkqA147 KB81 KB (55%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M8XQCCG142 KB68 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-LTWLTXJTKP&cx=c&gtm=4e64k1155 KB66 KB (43%)✓3rd
https://www.youtube.com/player_api4 KB—✓3rd
https://f.vimeocdn.com/p/4.46.43/js/vendor.module.js93 KB—✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=root,base140 KB—✓3rd
https://www.youtube-nocookie.com/s/player/820123f3/player_embed_es6.vflset/en_US/base.js436 KB—✓3rd
https://player.vimeo.com/api/player.js9 KB—✓3rd
https://www.swarthmore.edu/sites/default/files/js/js_giSujFfue2N36iWEbjqffm83IOB-kERM5_14MCtzw7Q.js?scope=header&delta=0&language=en&theme=swarthmore&include=eJxLz89Pz0mNL0lM108HEjrpqHy9xKzEClTBXJ3i8sSikozc_KJU_fSc_KTEHCSR-MTkxJz8dP3i5KLMghIAvXgkqA1 KB—✓3rd
https://f.vimeocdn.com/p/4.46.43/js/player.module.js212 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
3 fonts (121 KB)
PASS
3 fonts (121 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

121 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 9.8 s LCP 20.0 shttps://www.swarthmore.edu/themes/custom/swarthmore_theme/fonts/Larsseit.woff2Larsseit.woff2 https://www.swarthmore.edu/themes/custom/swarthmore_theme/fonts/Larsseit.woff2 — 43.2 KiB — 58 ms — font-display: swaphttps://www.swarthmore.edu/themes/custom/swarthmore_theme/fonts/Larsseit-Bold.woff2Larsseit-Bold.woff2 https://www.swarthmore.edu/themes/custom/swarthmore_theme/fonts/Larsseit-Bold.woff2 — 43.8 KiB — 63 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 54 ms — font-display: swap
Larsseit.woff2 woff2 swap
Size 43 KB
Load time 58 ms
Start 512 ms
Risk FOUT — text flashes from fallback to web font
Larsseit-Bold.woff2 woff2 swap
Size 44 KB
Load time 63 ms
Start 512 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 54 ms
Start 624 ms
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)
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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
3
preload
1
dns-prefetch
—
prefetch
—

4 resource hints configured

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
57 requests over 2865ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 9.8 s LCP 20.0 shttps://swarthmore.edu// https://swarthmore.edu/ — 301 — 116 B — 267 ms — http/1.0https://www.swarthmore.edu/www.swarthmore.edu/ https://www.swarthmore.edu/ — 200 — 29.2 KiB — 30 ms — h2https://www.swarthmore.edu/sites/default/files/styles/ambient_video_poster/public/assets/images/swarthmore-home/ambient_video_placeholder_spring_2026_1920x961_1.jpg.webp?itok=Hv2UC9iOwww.swarthmore.edu/sites/default/fi... https://www.swarthmore.edu/sites/default/files/styles/ambient_video_poster/public/assets/images/swarthmore-home/ambient_video_placeholder_spring_2026_1920x961_1.jpg.webp?itok=Hv2UC9iO — 200 — 446.5 KiB — 28 ms — h2https://www.swarthmore.edu/sites/default/files/css/css__KyOmLmrcRXtISHZ_zsqlJv1vkGrEmrWM4Xltnp1XJA.css?delta=0&language=en&theme=swarthmore&include=eJxFy0sKwCAMRdENia7pWYNaYg2J9rP70kLp5A4O3KUrhaRTwB4rTidQZIUU-_gXPzeZkasVSs4O6Cjt-TP3CHZ22aAWIozcXumw8Na3nibTDafxKYUwww.swarthmore.edu/sites/default/fi... https://www.swarthmore.edu/sites/default/files/css/css__KyOmLmrcRXtISHZ_zsqlJv1vkGrEmrWM4Xltnp1XJA.css?delta=0&language=en&theme=swarthmore&include=eJxFy0sKwCAMRdENia7pWYNaYg2J9rP70kLp5A4O3KUrhaRTwB4rTidQZIUU-_gXPzeZkasVSs4O6Cjt-TP3CHZ22aAWIozcXumw8Na3nibTDafxKYU — 200 — 1.9 KiB — 53 ms — h2https://www.swarthmore.edu/sites/default/files/css/css_nRToGU55zYfMKlADeYgEJUDcPhZ0VGt9T8yQFKNsxFo.css?delta=1&language=en&theme=swarthmore&include=eJxFy0sKwCAMRdENia7pWYNaYg2J9rP70kLp5A4O3KUrhaRTwB4rTidQZIUU-_gXPzeZkasVSs4O6Cjt-TP3CHZ22aAWIozcXumw8Na3nibTDafxKYUwww.swarthmore.edu/sites/default/fi... https://www.swarthmore.edu/sites/default/files/css/css_nRToGU55zYfMKlADeYgEJUDcPhZ0VGt9T8yQFKNsxFo.css?delta=1&language=en&theme=swarthmore&include=eJxFy0sKwCAMRdENia7pWYNaYg2J9rP70kLp5A4O3KUrhaRTwB4rTidQZIUU-_gXPzeZkasVSs4O6Cjt-TP3CHZ22aAWIozcXumw8Na3nibTDafxKYU — 200 — 82.0 KiB — 56 ms — h2https://www.swarthmore.edu/sites/default/files/js/js_giSujFfue2N36iWEbjqffm83IOB-kERM5_14MCtzw7Q.js?scope=header&delta=0&language=en&theme=swarthmore&include=eJxLz89Pz0mNL0lM108HEjrpqHy9xKzEClTBXJ3i8sSikozc_KJU_fSc_KTEHCSR-MTkxJz8dP3i5KLMghIAvXgkqAwww.swarthmore.edu/sites/default/fi... https://www.swarthmore.edu/sites/default/files/js/js_giSujFfue2N36iWEbjqffm83IOB-kERM5_14MCtzw7Q.js?scope=header&delta=0&language=en&theme=swarthmore&include=eJxLz89Pz0mNL0lM108HEjrpqHy9xKzEClTBXJ3i8sSikozc_KJU_fSc_KTEHCSR-MTkxJz8dP3i5KLMghIAvXgkqA — 200 — 689 B — 48 ms — h2https://www.swarthmore.edu/modules/contrib/google_tag/js/gtag.js?tdmviewww.swarthmore.edu/modules/contrib/... https://www.swarthmore.edu/modules/contrib/google_tag/js/gtag.js?tdmvie — 200 — 1014 B — 42 ms — h2https://www.swarthmore.edu/modules/contrib/google_tag/js/gtm.js?tdmviewww.swarthmore.edu/modules/contrib/... https://www.swarthmore.edu/modules/contrib/google_tag/js/gtm.js?tdmvie — 200 — 996 B — 28 ms — h2https://www.swarthmore.edu/sites/default/files/js/js_fWKh1eMp9sgrPnNXPtIuZLSCULDTl14zm1SSFM-le64.js?scope=footer&delta=0&language=en&theme=swarthmore&include=eJxLz89Pz0mNL0lM108HEjrpqHy9xKzEClTBXJ3i8sSikozc_KJU_fSc_KTEHCSR-MTkxJz8dP3i5KLMghIAvXgkqAwww.swarthmore.edu/sites/default/fi... https://www.swarthmore.edu/sites/default/files/js/js_fWKh1eMp9sgrPnNXPtIuZLSCULDTl14zm1SSFM-le64.js?scope=footer&delta=0&language=en&theme=swarthmore&include=eJxLz89Pz0mNL0lM108HEjrpqHy9xKzEClTBXJ3i8sSikozc_KJU_fSc_KTEHCSR-MTkxJz8dP3i5KLMghIAvXgkqA — 200 — 147.3 KiB — 54 ms — h2https://www.swarthmore.edu/themes/custom/swarthmore_theme/images/icons/favicons/site.webmanifestwww.swarthmore.edu/themes/custom/sw... https://www.swarthmore.edu/themes/custom/swarthmore_theme/images/icons/favicons/site.webmanifest — 200 — 949 B — 29 ms — h2https://www.swarthmore.edu/sites/default/files/css/css_Yys2aOANk9V82JjcMU8j6fSPwzLYwn6GbBdAWliWykI.css?delta=2&language=en&theme=swarthmore&include=eJxFy0sKwCAMRdENia7pWYNaYg2J9rP70kLp5A4O3KUrhaRTwB4rTidQZIUU-_gXPzeZkasVSs4O6Cjt-TP3CHZ22aAWIozcXumw8Na3nibTDafxKYUwww.swarthmore.edu/sites/default/fi... https://www.swarthmore.edu/sites/default/files/css/css_Yys2aOANk9V82JjcMU8j6fSPwzLYwn6GbBdAWliWykI.css?delta=2&language=en&theme=swarthmore&include=eJxFy0sKwCAMRdENia7pWYNaYg2J9rP70kLp5A4O3KUrhaRTwB4rTidQZIUU-_gXPzeZkasVSs4O6Cjt-TP3CHZ22aAWIozcXumw8Na3nibTDafxKYU — 200 — 3.1 KiB — 11 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-M8XQCCGwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-M8XQCCG — 200 — 141.5 KiB — 139 ms — h2https://player.vimeo.com/video/1168179955?background=1&autoplay=1&muted=1&loop=1&autopause=0&playsinline=1&dnt=1&controls=0&byline=0&portrait=0player.vimeo.com/video/1168179955?b... https://player.vimeo.com/video/1168179955?background=1&autoplay=1&muted=1&loop=1&autopause=0&playsinline=1&dnt=1&controls=0&byline=0&portrait=0 — 200 — 10.9 KiB — 195 ms — http/1.1https://www.youtube-nocookie.com/embed/TefQPEZYAv4?autoplay=0&start=0&rel=0&origin=https%3A%2F%2Fwww.swarthmore.edu&playsinline=1&enablejsapi=1&controls=1www.youtube-nocookie.com/embed/TefQ... https://www.youtube-nocookie.com/embed/TefQPEZYAv4?autoplay=0&start=0&rel=0&origin=https%3A%2F%2Fwww.swarthmore.edu&playsinline=1&enablejsapi=1&controls=1 — 200 — 57.6 KiB — 127 ms — 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https://vod-adaptive-ak.vimeocdn.com/exp=1776902705~acl=%2F944eda11-8eea-4846-a16f-7434d38f12dc%2Fpsid%3Dfb4b7538e64537bf01552f366c2be079a2497eeb9c158c199a9d059420d635cc%2F%2A~hmac=6859f7fc93a5200c740ff944c7f3e083010558180099990c83afd91b93a648dc/944eda11-8eea-4846-a16f-7434d38f12dc/psid=fb4b7538e64537bf01552f366c2be079a2497eeb9c158c199a9d059420d635cc/v2/range/prot/cmFuZ2U9MTYyNTAzOC0yMTYwMTM1/avf/d1cc1dc8-0a78-4db4-99ad-fc8d178a9a21.mp4?pathsig=8c953e4f~EUwnnTBNtUgEESwEHzeQ4_GwtKKILydmuzsnwenaUJ0&r=dXMtY2VudHJhbDE%3D&range=1625038-2160135 — 200 — 523.5 KiB — 162 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 4172ms · 564KB · $55/mo
www.swarthmore.edu
Other
Costly
Execution 1285ms
Transfer 147 KB
Unused 55%
Monthly Cost $17/mo
www.swarthmore.edu
Other
Costly
Execution 1104ms
Transfer 29 KB
Monthly Cost $15/mo
Google Tag Manager
Tag Manager
Costly
Execution 531ms
Transfer 155 KB
Unused 43%
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 508ms
Transfer 142 KB
Unused 48%
Monthly Cost $7/mo
Unattributable
Other
Costly
Execution 444ms
Transfer 0 KB
Monthly Cost $6/mo
player.vimeo.com
Other
Optional
Execution 153ms
Transfer 9 KB
Monthly Cost $2/mo
www.swarthmore.edu
Other
Optional
Execution 147ms
Transfer 82 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • www.swarthmore.edu adds 1285ms and costs ~$17/month
  • www.swarthmore.edu adds 1104ms and costs ~$15/month
  • Google Tag Manager adds 531ms and costs ~$7/month
  • Google Tag Manager adds 508ms and costs ~$7/month
  • Unattributable adds 444ms and costs ~$6/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.swarthmore.edu takes 1285ms 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

55% of www.swarthmore.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

www.swarthmore.edu takes 1104ms 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 531ms 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 508ms 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 444ms 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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