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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
30
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

4.67 s

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

21.21 s

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

1.66 s

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

0.079

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

9.00 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.

23.40 s

Page Load Progression

413 ms
826 ms
1.2 s
1.7 s
2.1 s
2.5 s
2.9 s
3.3 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
21.9 MB transferred, 68 requests
FIX
21.9 MB transferred, 68 requests
Critical::
Page weighs 25.1 MB (21.9 MB transferred)
Warning::
Images are 7.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 7.0 MB
Warning::
JavaScript is 959 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 959 KB
Info::
Fonts are 584 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 584 KB
Info::
68 HTTP requests
Info::
Estimated 4.6 g CO2 per page load
21.9 MB / 2.4 MB budget
21.9 MB transferred
68 requests
4.6 g CO2 per page load
Other 13.0 MiB 60%
Images 7.0 MiB 32%
JavaScript 959.0 KiB 4%
Fonts 583.9 KiB 3%
Other 127.9 KiB 1%
CSS 105.5 KiB 0%
HTML 39.9 KiB 0%
Other 5.1 KiB 0%
Other 2.4 KiB 0%
Other 561 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Why this matters

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

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (21.9 MiB of 21.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5515ms total JS execution
FIX
5515ms total JS execution
Warning::
https://www.vanderbilt.edu/: 1178ms CPU time
Warning::
Unattributable: 971ms CPU time
Warning::
https://cdn.vanderbilt.edu/vu-futurevu/assets/vu.j...: 865ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-Q8Z6...: 634ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MH8...: 623ms CPU time
Warning::
Third-party scripts: 5515ms (100% of total)

Main Thread Breakdown

Script Evaluation 40% Other 26% Style & Layout 16% Script Parsing & Compilation 11% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.vanderbilt.edu/1178ms10ms3ms3rd
Unattributable971ms30ms0ms3rd
https://cdn.vanderbilt.edu/vu-futurevu/assets/vu.js?ver=20260323865ms330ms74ms3rd
https://www.googletagmanager.com/gtag/js?id=G-Q8Z61J6QLT&cx=c&gtm=4e64h1634ms389ms239ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MH87FL623ms506ms105ms3rd
https://cdn.hu-manity.co/hu-banner.min.js353ms245ms19ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js278ms224ms48ms3rd
https://www.vanderbilt.edu/wp-includes/js/jquery/jquery.min.js?ver=3.6.1199ms159ms15ms3rd
https://connect.facebook.net/en_US/fbevents.js182ms131ms50ms3rd
https://cdn.hu-manity.co/hu-consent.min.js90ms62ms27ms3rd

Showing top 10 of 12 scripts

D
JS Bundles
Action
17 scripts, 386 KB unused
FIX
17 scripts, 386 KB unused
Warning::
https://cdn.vanderbilt.edu/vu-futurevu/assets/vu.j...: 110 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MH8...: 64 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-Q8Z6...: 62 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.hu-manity.co/hu-consent.min.js: 43 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.hotjar.com/modules.6a0f3932cb1341a3...: 38 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 386 KB
386 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.vanderbilt.edu/vu-futurevu/assets/vu.js?ver=20260323166 KB110 KB (66%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MH87FL186 KB64 KB (35%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-Q8Z61J6QLT&cx=c&gtm=4e64h1156 KB62 KB (40%)✓3rd
https://cdn.hu-manity.co/hu-consent.min.js77 KB43 KB (60%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB37 KB (38%)✓3rd
https://cdn.hu-manity.co/hu-display.min.js80 KB32 KB (39%)✓3rd
https://www.vanderbilt.edu/wp-content/uploads/sites/3/bb-plugin/cache/8055-layout.js?ver=44f3722f05a1c035e4ac7e2670d473749 KB—✗3rd
https://www.vanderbilt.edu/wp-content/themes/anchordown-futurevu/library/scripts/story-list.js?ver=1.06 KB—✗3rd
https://www.vanderbilt.edu/wp-content/plugins/page-links-to/dist/new-tab.js?ver=3.3.713 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

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

D
Page Weight Inventory
Action
68 resources · 21.9 MB · 386 KB savings available
FIX
68 resources · 21.9 MB · 386 KB savings available
Warning::
Page weight 20.9 MB over 1MB target
Got: 21.9 MB Expected: ≤ 1 MB
Info::
~386 KB of savings available
Warning::
67 third-party resources (100% of weight)
Info::
13 resources over 200KB
68 resources · 21.9 MiB · 67 third-party 20.9 MiB over 1MB target
Media 60% · 13.0 MiB
Image 32% · 7.0 MiB
JavaScript 4% · 959.0 KiB
Font 3% · 583.9 KiB
Other 1% · 133.8 KiB
CSS 0% · 105.5 KiB
Document 0% · 39.9 KiB

~386.2 KiB of savings available

Remove unused JavaScript: 386.2 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
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://www.vanderbilt.edu/wp-content/uploads/site... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.vanderbilt.edu/wp-content/uploads/site... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.vanderbilt.edu/wp-content/uploads/site... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.vanderbilt.edu/wp-content/uploads/site... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.vanderbilt.edu/wp-content/uploads/site... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.vanderbilt.edu/wp-content/uploads/site... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.vanderbilt.edu/wp-content/uploads/site... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 7.0 MB
0 oversized -0 KB
22 legacy format
7 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

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
10 fonts (584 KB)
PASS
10 fonts (584 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

584 KB total

Render-blocking

0

of 10

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 22.0 s FCP 4.7 s LCP 21.2 shttps://cdn.vanderbilt.edu/vu-futurevu/static/fonts/Theinhardt/complete/Theinhardt-Medium.woff2Theinhardt-Medium.woff2 https://cdn.vanderbilt.edu/vu-futurevu/static/fonts/Theinhardt/complete/Theinhardt-Medium.woff2 — 50.5 KiB — 29 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/webfonts/fa-solid-900.woff2 — 77.0 KiB — 32 ms — font-display: swaphttps://cdn.vanderbilt.edu/vu-futurevu/static/fonts/Theinhardt/complete/Theinhardt-Regular.woff2Theinhardt-Regular.woff2 https://cdn.vanderbilt.edu/vu-futurevu/static/fonts/Theinhardt/complete/Theinhardt-Regular.woff2 — 50.2 KiB — 51 ms — font-display: swaphttps://cdn.vanderbilt.edu/vu-futurevu/static/fonts/JJannon/complete/JJannon-Display-Regular.woff2JJannon-Display-Regular... https://cdn.vanderbilt.edu/vu-futurevu/static/fonts/JJannon/complete/JJannon-Display-Regular.woff2 — 81.3 KiB — 73 ms — font-display: swaphttps://cdn.vanderbilt.edu/vu-futurevu/static/fonts/JJannon/complete/JJannon-Display-Light.woff2JJannon-Display-Light.w... https://cdn.vanderbilt.edu/vu-futurevu/static/fonts/JJannon/complete/JJannon-Display-Light.woff2 — 81.2 KiB — 84 ms — font-display: swaphttps://cdn.vanderbilt.edu/vu-futurevu/static/fonts/Staff/complete/StaffXXCondensed-SemiBold.woff2StaffXXCondensed-SemiBo... https://cdn.vanderbilt.edu/vu-futurevu/static/fonts/Staff/complete/StaffXXCondensed-SemiBold.woff2 — 27.6 KiB — 99 ms — font-display: swaphttps://cdn.vanderbilt.edu/vu-futurevu/static/fonts/Academica/complete/AcademicaMedium.woff2AcademicaMedium.woff2 https://cdn.vanderbilt.edu/vu-futurevu/static/fonts/Academica/complete/AcademicaMedium.woff2 — 47.3 KiB — 55 ms — font-display: swaphttps://cdn.vanderbilt.edu/vu-futurevu/static/fonts/Academica/complete/AcademicaLight.woff2AcademicaLight.woff2 https://cdn.vanderbilt.edu/vu-futurevu/static/fonts/Academica/complete/AcademicaLight.woff2 — 43.5 KiB — 92 ms — font-display: swaphttps://cdn.vanderbilt.edu/vu-futurevu/static/fonts/Theinhardt/complete/Theinhardt-Light.woff2Theinhardt-Light.woff2 https://cdn.vanderbilt.edu/vu-futurevu/static/fonts/Theinhardt/complete/Theinhardt-Light.woff2 — 49.5 KiB — 35 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/webfonts/fa-brands-400.woff2 — 75.6 KiB — 44 ms — font-display: swap
Theinhardt-Medium.woff2 woff2 swap
Size 51 KB
Load time 29 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 77 KB
Load time 32 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
Theinhardt-Regular.woff2 woff2 swap
Size 50 KB
Load time 51 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
JJannon-Display-Regular... woff2 swap
Size 81 KB
Load time 73 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
JJannon-Display-Light.w... woff2 swap
Size 81 KB
Load time 84 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
StaffXXCondensed-SemiBo... woff2 swap
Size 28 KB
Load time 99 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
AcademicaMedium.woff2 woff2 swap
Size 47 KB
Load time 55 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
AcademicaLight.woff2 woff2 swap
Size 44 KB
Load time 92 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
Theinhardt-Light.woff2 woff2 swap
Size 50 KB
Load time 35 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 76 KB
Load time 44 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
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
—
preload
—
dns-prefetch
4
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
68 requests over 3938ms
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 22.0 s FCP 4.7 s LCP 21.2 shttps://vanderbilt.edu// https://vanderbilt.edu/ — 302 — 247 B — 845 ms — h2https://www.vanderbilt.edu/www.vanderbilt.edu/ https://www.vanderbilt.edu/ — 200 — 39.9 KiB — 343 ms — h2https://cdn.hu-manity.co/hu-banner.min.jscdn.hu-manity.co/hu-banner.min.js https://cdn.hu-manity.co/hu-banner.min.js — 200 — 44.6 KiB — 254 ms — h2https://www.vanderbilt.edu/wp-includes/css/dist/block-library/style.min.css?ver=6.1.10www.vanderbilt.edu/wp-includes/css/... https://www.vanderbilt.edu/wp-includes/css/dist/block-library/style.min.css?ver=6.1.10 — 200 — 11.9 KiB — 705 ms — h2https://www.vanderbilt.edu/wp-includes/css/classic-themes.min.css?ver=1www.vanderbilt.edu/wp-includes/css/... https://www.vanderbilt.edu/wp-includes/css/classic-themes.min.css?ver=1 — 200 — 654 B — 20 ms — h2https://cdn.vanderbilt.edu/vu-futurevu/assets/vu.css?ver=20260323cdn.vanderbilt.edu/vu-futurevu/asse... https://cdn.vanderbilt.edu/vu-futurevu/assets/vu.css?ver=20260323 — 200 — 78.2 KiB — 182 ms — h2https://www.vanderbilt.edu/wp-content/themes/anchordown-futurevu/style.css?ver=1.0.0www.vanderbilt.edu/wp-content/theme... https://www.vanderbilt.edu/wp-content/themes/anchordown-futurevu/style.css?ver=1.0.0 — 200 — 996 B — 20 ms — h2https://www.vanderbilt.edu/wp-content/themes/anchordown-futurevu-child-big-vanderbilt/style.css?ver=1.0.3www.vanderbilt.edu/wp-content/theme... https://www.vanderbilt.edu/wp-content/themes/anchordown-futurevu-child-big-vanderbilt/style.css?ver=1.0.3 — 200 — 2.9 KiB — 701 ms — h2https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css?ver=1.0.0cdnjs.cloudflare.com/ajax/libs/font... https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css?ver=1.0.0 — 200 — 10.9 KiB — 25 ms — h3https://www.vanderbilt.edu/wp-content/uploads/sites/3/2026/03/06ae58bc640de4d363cb2a782e499f62-1800x1200-c-default.jpgwww.vanderbilt.edu/wp-content/uploa... https://www.vanderbilt.edu/wp-content/uploads/sites/3/2026/03/06ae58bc640de4d363cb2a782e499f62-1800x1200-c-default.jpg — 200 — 309.6 KiB — 68 ms — h2https://www.vanderbilt.edu/wp-content/uploads/sites/3/2021/07/person-book-library-1-1800x1200-c-default.jpegwww.vanderbilt.edu/wp-content/uploa... https://www.vanderbilt.edu/wp-content/uploads/sites/3/2021/07/person-book-library-1-1800x1200-c-default.jpeg — 200 — 281.8 KiB — 41 ms — h2https://www.vanderbilt.edu/wp-content/uploads/sites/3/2026/03/9af6eb1733819344a3809c99f9da6a0b-1800x1200-c-default.jpgwww.vanderbilt.edu/wp-content/uploa... https://www.vanderbilt.edu/wp-content/uploads/sites/3/2026/03/9af6eb1733819344a3809c99f9da6a0b-1800x1200-c-default.jpg — 200 — 254.7 KiB — 48 ms — h2https://www.vanderbilt.edu/wp-content/uploads/sites/3/2026/03/d9a927204eb7ef7ac806f61f4dedaa67-1800x1200-c-default.jpegwww.vanderbilt.edu/wp-content/uploa... https://www.vanderbilt.edu/wp-content/uploads/sites/3/2026/03/d9a927204eb7ef7ac806f61f4dedaa67-1800x1200-c-default.jpeg — 200 — 192.6 KiB — 36 ms — h2https://www.vanderbilt.edu/wp-content/uploads/sites/3/2026/03/e37927b196c2a0d506403eda4e28f809-1800x1200-c-default.jpgwww.vanderbilt.edu/wp-content/uploa... https://www.vanderbilt.edu/wp-content/uploads/sites/3/2026/03/e37927b196c2a0d506403eda4e28f809-1800x1200-c-default.jpg — 200 — 571.3 KiB — 62 ms — h2https://www.vanderbilt.edu/wp-includes/js/jquery/jquery.min.js?ver=3.6.1www.vanderbilt.edu/wp-includes/js/j... https://www.vanderbilt.edu/wp-includes/js/jquery/jquery.min.js?ver=3.6.1 — 200 — 31.0 KiB — 690 ms — h2https://www.vanderbilt.edu/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.3.2www.vanderbilt.edu/wp-includes/js/j... 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https://transactional-api.hu-manity.co/api/transactional/session/save — 200 — 472 B — 175 ms — h2https://www.vanderbilt.edu/wp-content/uploads/sites/3/2025/10/band-400x400-c-default.jpgwww.vanderbilt.edu/wp-content/uploa... https://www.vanderbilt.edu/wp-content/uploads/sites/3/2025/10/band-400x400-c-default.jpg — 200 — 36.8 KiB — 733 ms — h2https://www.vanderbilt.edu/wp-content/uploads/sites/3/2025/10/running-400x400-c-default.jpgwww.vanderbilt.edu/wp-content/uploa... https://www.vanderbilt.edu/wp-content/uploads/sites/3/2025/10/running-400x400-c-default.jpg — 200 — 38.4 KiB — 760 ms — h2https://cdn.vanderbilt.edu/vu-futurevu/static/fonts/Theinhardt/complete/Theinhardt-Medium.woff2cdn.vanderbilt.edu/vu-futurevu/stat... https://cdn.vanderbilt.edu/vu-futurevu/static/fonts/Theinhardt/complete/Theinhardt-Medium.woff2 — 200 — 50.5 KiB — 29 ms — h2https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/webfonts/fa-solid-900.woff2cdnjs.cloudflare.com/ajax/libs/font... 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 5515ms · 958KB · $22/mo
www.vanderbilt.edu
Other
Costly
Execution 1178ms
Transfer 40 KB
Monthly Cost $5/mo
Unattributable
Other
Costly
Execution 971ms
Transfer 0 KB
Monthly Cost $4/mo
cdn.vanderbilt.edu
Other
Costly
Execution 865ms
Transfer 166 KB
Unused 66%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 634ms
Transfer 156 KB
Unused 40%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Costly
Execution 623ms
Transfer 186 KB
Unused 35%
Monthly Cost $2/mo
cdn.hu-manity.co
Other
Costly
Execution 353ms
Transfer 45 KB
Monthly Cost $1/mo
Hotjar
Session Replay
Costly
Execution 278ms
Transfer 57 KB
Unused 67%
Monthly Cost $1/mo
www.vanderbilt.edu
Other
Optional
Execution 199ms
Transfer 31 KB
Monthly Cost $1/mo
Facebook Pixel
Advertising
Optional
Execution 182ms
Transfer 97 KB
Unused 38%
Monthly Cost $1/mo
cdn.hu-manity.co
Other
Optional
Execution 90ms
Transfer 77 KB
Unused 60%
Monthly Cost $0/mo
Facebook Pixel
Advertising
Optional
Execution 85ms
Transfer 23 KB
Monthly Cost $0/mo
cdn.hu-manity.co
Other
Optional
Execution 56ms
Transfer 80 KB
Unused 39%
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • www.vanderbilt.edu adds 1178ms and costs ~$5/month
  • Unattributable adds 971ms and costs ~$4/month
  • cdn.vanderbilt.edu adds 865ms and costs ~$3/month
  • Google Tag Manager adds 634ms and costs ~$2/month
  • Google Tag Manager adds 623ms and costs ~$2/month
  • cdn.hu-manity.co adds 353ms and costs ~$1/month
  • Hotjar adds 278ms and costs ~$1/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.vanderbilt.edu takes 1178ms 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 971ms 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

cdn.vanderbilt.edu takes 865ms 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

66% of cdn.vanderbilt.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

Google Tag Manager takes 634ms 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 623ms 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

cdn.hu-manity.co takes 353ms 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

Hotjar takes 278ms 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

67% of Hotjar'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

60% of cdn.hu-manity.co's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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