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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
79
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.
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.

895 ms

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

3.24 s

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

0 ms

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

0.001

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

1.66 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.

3.25 s

Page Load Progression

496 ms
993 ms
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
15
6 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
7.1 MB transferred, 88 requests
FIX
7.1 MB transferred, 88 requests
Critical::
Page weighs 9.1 MB (7.1 MB transferred)
Warning::
Images are 5.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.2 MB
Warning::
JavaScript is 770 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 770 KB
Info::
88 HTTP requests
Info::
Estimated 1.5 g CO2 per page load
7.1 MB / 2.4 MB budget
7.1 MB transferred
88 requests
1.5 g CO2 per page load
Images 5.2 MiB 73%
Other 959.6 KiB 13%
JavaScript 770.2 KiB 11%
Fonts 133.3 KiB 2%
CSS 66.9 KiB 1%
HTML 35.2 KiB 0%
Other 4.5 KiB 0%
Other 2.2 KiB 0%
Other 1.5 KiB 0%
Other 546 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

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 (7.1 MiB of 7.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
20 scripts, 432 KB unused
FIX
20 scripts, 432 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-5RF...: 110 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-T94Z...: 110 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-5RF...: 67 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TXV...: 65 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://washu.edu/app/plugins/washu-cludo-function...: 57 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 432 KB
432 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=GT-5RF8WH5&cx=c&gtm=4e64h1157 KB110 KB (70%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-T94ZQ4ENLH&cx=c&gtm=4e64h1157 KB110 KB (70%)✓3rd
https://www.googletagmanager.com/gtag/js?id=GT-5RF8WH5157 KB67 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TXV3L6Q131 KB65 KB (49%)✓3rd
https://washu.edu/app/plugins/washu-cludo-functionality//cludo-config/dist/js/cludo-search-results.js?ver=1.0.388 KB57 KB (64%)✓3rd
https://customer.cludo.com/scripts/bundles/search-script.min.js?ver=1.0.351 KB25 KB (51%)✓3rd
https://washu.edu/app/themes/washuedu-theme/build/script-small-photo-promo.js?ver=1.0.384 KB—✓3rd
https://washu.edu/wp/wp-includes/js/dist/dom-ready.min.js?ver=f77871ff7694fffea3811 KB—✓3rd
https://washu.edu/app/themes/washuedu-theme/build/script-story-carousel.js?ver=e36bc714e21d6a96886e1 KB—✓3rd
https://washu.edu/app/themes/washuedu-theme/build/script-flag-half-staff.js?ver=eb92675966cf04e5ddd81 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

F
Page Weight Inventory
Action
88 resources · 7.1 MB · 432 KB savings available
FIX
88 resources · 7.1 MB · 432 KB savings available
Warning::
Page weight 6.1 MB over 1MB target
Got: 7.1 MB Expected: ≤ 1 MB
Info::
~432 KB of savings available
Warning::
87 third-party resources (100% of weight)
Info::
9 resources over 200KB
88 resources · 7.1 MiB · 87 third-party 6.1 MiB over 1MB target
Image 73% · 5.2 MiB
Media 13% · 959.6 KiB
JavaScript 11% · 770.2 KiB
Font 2% · 133.3 KiB
CSS 1% · 66.9 KiB
Document 0% · 36.1 KiB
Other 0% · 5.7 KiB

~432.3 KiB of savings available

Remove unused JavaScript: 432.3 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
31 images, 0 KB saveable
REVIEW
31 images, 0 KB saveable
Warning::
https://washu.edu/app/uploads/2024/07/MLTM-843_527... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://qa-washuedu-2024-washu.pantheonsite.io/app... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2026/01/1-1024x1024.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2026/01/3-1024x1024.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2024/06/20231019_NRB... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2026/03/AdvancingOur... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2024/06/MLTM-1155_06... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2025/11/MLTM-3388_48... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2026/01/2-1024x1024.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2026/01/4-1024x1024.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2024/06/MLTM-398_041... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2024/05/campaign-gra... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://qa-washuedu-2024-washu.pantheonsite.io/app... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
31 images 5.2 MB
0 oversized -0 KB
27 legacy format
13 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
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
411ms total JS execution
PASS
411ms total JS execution
Info::
https://washu.edu/: 155ms CPU time
Info::
Unattributable: 132ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=GT-5RF...: 72ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TXV...: 52ms CPU time
Warning::
Third-party scripts: 411ms (100% of total)

Main Thread Breakdown

Other 30% Script Evaluation 30% Style & Layout 20% Script Parsing & Compilation 11% Parse HTML & CSS 5% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://washu.edu/155ms2ms1ms3rd
Unattributable132ms4ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=GT-5RF8WH572ms58ms14ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TXV3L6Q52ms41ms11ms3rd
A+
Font Loading
6 fonts (133 KB)
PASS
6 fonts (133 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

133 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 895 ms LCP 3.2 shttps://use.typekit.net/af/eeee61/00000000000000007735c082/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/eeee61/00000000000000007735c082/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 19.4 KiB — 4 ms — font-display: swaphttps://use.typekit.net/af/4db78a/00000000000000007735c074/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3l https://use.typekit.net/af/4db78a/00000000000000007735c074/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3 — 19.8 KiB — 6 ms — font-display: swaphttps://use.typekit.net/af/e456f5/00000000000000007735e5a2/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/e456f5/00000000000000007735e5a2/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 34.6 KiB — 7 ms — font-display: swaphttps://use.typekit.net/af/cd024c/00000000000000007735c086/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3l https://use.typekit.net/af/cd024c/00000000000000007735c086/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3 — 19.8 KiB — 7 ms — font-display: swaphttps://use.typekit.net/af/ffa0cc/00000000000000007735c08a/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i6&v=3l https://use.typekit.net/af/ffa0cc/00000000000000007735c08a/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i6&v=3 — 20.3 KiB — 9 ms — font-display: swaphttps://use.typekit.net/af/34725e/00000000000000007735c091/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3l https://use.typekit.net/af/34725e/00000000000000007735c091/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3 — 19.3 KiB — 10 ms — font-display: swap
l woff2 swap
Size 19 KB
Load time 4 ms
Start 242 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 6 ms
Start 242 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 35 KB
Load time 7 ms
Start 242 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 7 ms
Start 243 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 9 ms
Start 243 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 10 ms
Start 243 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
88 requests over 1681ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 895 ms LCP 3.2 shttps://wustl.edu// https://wustl.edu/ — 301 — 204 B — 6 ms — h2https://washu.edu/washu.edu/ https://washu.edu/ — 200 — 35.2 KiB — 14 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-flag-half-staff.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-flag-half-staff.css?ver=1.0.38 — 200 — 1.4 KiB — 8 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-nav-item.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-nav-item.css?ver=1.0.38 — 200 — 275 B — 8 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-nav-link.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-nav-link.css?ver=1.0.38 — 200 — 662 B — 8 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-nav-overview.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-nav-overview.css?ver=1.0.38 — 200 — 251 B — 20 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-news-list.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-news-list.css?ver=1.0.38 — 200 — 686 B — 22 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-small-photo-promo.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-small-photo-promo.css?ver=1.0.38 — 200 — 1.9 KiB — 39 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-social-promo.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-social-promo.css?ver=1.0.38 — 200 — 1.1 KiB — 21 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-story-carousel.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-story-carousel.css?ver=1.0.38 — 200 — 1.8 KiB — 28 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-vertical-border.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-vertical-border.css?ver=1.0.38 — 200 — 940 B — 28 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-video-topper.css?ver=4.0.45washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-video-topper.css?ver=4.0.45 — 200 — 852 B — 37 ms — h2https://washu.edu/app/themes/antipasto/build/style-call-out.css?ver=4.0.45washu.edu/app/themes/antipasto/buil... https://washu.edu/app/themes/antipasto/build/style-call-out.css?ver=4.0.45 — 200 — 5.4 KiB — 30 ms — h2https://washu.edu/app/plugins/washu-emergency-alerts/css/style.css?ver=1.5.3washu.edu/app/plugins/washu-emergen... https://washu.edu/app/plugins/washu-emergency-alerts/css/style.css?ver=1.5.3 — 200 — 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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 411ms · 324KB · $5/mo
washu.edu
Other
Optional
Execution 155ms
Transfer 35 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 132ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 72ms
Transfer 157 KB
Unused 42%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 52ms
Transfer 131 KB
Unused 49%
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

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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