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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
58
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
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.

3.86 s

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

14.27 s

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

151 ms

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

0.011

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

8.38 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.

16.95 s

Page Load Progression

809 ms
1.6 s
2.4 s
3.2 s
4.0 s
4.9 s
5.7 s
6.5 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 55 requests
FIX
3.7 MB transferred, 55 requests
Warning::
Page weighs 4.8 MB (3.7 MB transferred)
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
Info::
Fonts are 988 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 988 KB
Info::
55 HTTP requests
Info::
Estimated 0.79 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
55 requests
0.79 g CO2 per page load
Images 1.6 MiB 41%
Fonts 988.2 KiB 26%
Other 734.6 KiB 19%
JavaScript 387.0 KiB 10%
CSS 93.9 KiB 2%
HTML 37.0 KiB 1%
Other 1.3 KiB 0%
Other 828 B 0%
Other 547 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

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 (3.7 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3784ms total JS execution
FIX
3784ms total JS execution
Warning::
https://www.duke.edu/: 2419ms CPU time
Warning::
Unattributable: 483ms CPU time
Warning::
https://scripts.clarity.ms/0.8.60-beta/clarity.js: 319ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-EFHN...: 228ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PSP...: 222ms CPU time
Warning::
Third-party scripts: 3784ms (100% of total)

Main Thread Breakdown

Other 33% Style & Layout 25% Script Evaluation 23% Rendering 14%
ScriptTotalScriptingParse/CompileParty
https://www.duke.edu/2419ms12ms1ms3rd
Unattributable483ms11ms0ms3rd
https://scripts.clarity.ms/0.8.60-beta/clarity.js319ms239ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=G-EFHNRXCSHV&cx=c&gtm=4e64h1228ms185ms41ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PSPVTBK222ms169ms43ms3rd
https://ssl.google-analytics.com/ga.js59ms49ms4ms3rd
https://www.duke.edu/wp-content/plugins/duke-blocks/build/video/view.js?ver=f05780a798ab99b93e0254ms44ms0ms3rd
D
Page Weight Inventory
Action
55 resources · 3.7 MB · 148 KB savings available
FIX
55 resources · 3.7 MB · 148 KB savings available
Warning::
Page weight 2.7 MB over 1MB target
Got: 3.7 MB Expected: ≤ 1 MB
Info::
~148 KB of savings available
Warning::
54 third-party resources (100% of weight)
Info::
5 resources over 200KB
55 resources · 3.7 MiB · 54 third-party 2.7 MiB over 1MB target
Image 42% · 1.6 MiB
Font 26% · 988.2 KiB
Media 19% · 734.6 KiB
JavaScript 10% · 387.0 KiB
CSS 2% · 93.9 KiB
Document 1% · 37.2 KiB
Other 0% · 1.3 KiB

~147.6 KiB of savings available

Remove unused JavaScript: 147.6 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
14 images, 0 KB saveable
REVIEW
14 images, 0 KB saveable
Warning::
https://www.duke.edu/wp-content/plugins/duke-block... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
14 images 1.6 MB
0 oversized -0 KB
12 legacy format
1 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

B
JS Bundles
20 scripts, 148 KB unused
REVIEW
20 scripts, 148 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-EFHN...: 65 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PSP...: 62 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.duke.edu/wp-includes/js/jquery/jquery....: 20 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 148 KB
148 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-EFHNRXCSHV&cx=c&gtm=4e64h1152 KB65 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PSPVTBK133 KB62 KB (47%)✓3rd
https://www.duke.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.130 KB20 KB (68%)✓3rd
https://www.duke.edu/wp-content/themes/duke-block-homepage/assets/js/front-end.js?ver=d49a6e163b0c4115ba192 KB—✓3rd
https://www.clarity.ms/tag/qqq24l56vd1 KB—✓3rd
https://www.duke.edu/wp-content/plugins/duke-blocks/assets/js/duke-blocks-frontend.js?ver=17724841051 KB—✓3rd
https://www.duke.edu/wp-content/plugins/duke-blocks/build/duke-menu/view.js?ver=2ee6d6e39e96cf0add6b1 KB—✓3rd
https://www.duke.edu/wp-content/plugins/duke-blocks/build/hidden-content/view.js?ver=31d6cfe0d16ae931b73c0 KB—✓3rd
https://www.duke.edu/wp-content/plugins/duke-blocks/build/section-heading/view.js?ver=f8f2baec9ab8281305fd1 KB—✓3rd
https://www.duke.edu/wp-content/plugins/duke-alertbar/public/js/duke-alertbar-public.js?ver=1.0.01 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
4 fonts (988 KB)
PASS
4 fonts (988 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

988 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 3.9 s LCP 14.3 shttps://www.duke.edu/wp-content/themes/duke-block-homepage/assets/fonts/quattrocento/Quattrocento-Regular.ttfQuattrocento-Regular.ttf https://www.duke.edu/wp-content/themes/duke-block-homepage/assets/fonts/quattrocento/Quattrocento-Regular.ttf — 144.5 KiB — 674 ms — font-display: swaphttps://www.duke.edu/wp-content/themes/duke-block-homepage/assets/styles/fonts/duke-icons.8c5c276b.ttfduke-icons.8c5c276b.ttf https://www.duke.edu/wp-content/themes/duke-block-homepage/assets/styles/fonts/duke-icons.8c5c276b.ttf — 20.4 KiB — 342 ms — font-display: swaphttps://www.duke.edu/wp-content/themes/duke-block-homepage/assets/fonts/montserrat/Montserrat-VariableFont_wght.ttfMontserrat-VariableFont... https://www.duke.edu/wp-content/themes/duke-block-homepage/assets/fonts/montserrat/Montserrat-VariableFont_wght.ttf — 672.7 KiB — 1.4 s — font-display: swaphttps://www.duke.edu/wp-content/themes/duke-block-homepage/assets/fonts/quattrocento/Quattrocento-Bold.ttfQuattrocento-Bold.ttf https://www.duke.edu/wp-content/themes/duke-block-homepage/assets/fonts/quattrocento/Quattrocento-Bold.ttf — 150.6 KiB — 707 ms — font-display: swap
Quattrocento-Regular.ttf ttf swap
Size 145 KB
Load time 674 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
duke-icons.8c5c276b.ttf ttf swap
Size 20 KB
Load time 342 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Montserrat-VariableFont... ttf swap
Size 673 KB
Load time 1.4 s
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Quattrocento-Bold.ttf ttf swap
Size 151 KB
Load time 707 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~780 KB and ~1560 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
1
prefetch
—

1 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
55 requests over 5663ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 3.9 s LCP 14.3 shttps://duke.edu// https://duke.edu/ — 302 — 193 B — 345 ms — http/1.1https://www.duke.edu/www.duke.edu/ https://www.duke.edu/ — 200 — 37.0 KiB — 460 ms — http/1.1https://www.duke.edu/wp-includes/blocks/image/style.min.css?ver=6.9.4www.duke.edu/wp-includes/blocks/ima... https://www.duke.edu/wp-includes/blocks/image/style.min.css?ver=6.9.4 — 200 — 1.8 KiB — 335 ms — http/1.1https://www.duke.edu/wp-includes/blocks/navigation/style.min.css?ver=6.9.4www.duke.edu/wp-includes/blocks/nav... https://www.duke.edu/wp-includes/blocks/navigation/style.min.css?ver=6.9.4 — 200 — 2.5 KiB — 346 ms — http/1.1https://www.duke.edu/wp-content/plugins/duke-blocks/build/duke-menu/style-index.css?ver=0.1.0www.duke.edu/wp-content/plugins/duk... https://www.duke.edu/wp-content/plugins/duke-blocks/build/duke-menu/style-index.css?ver=0.1.0 — 200 — 4.3 KiB — 350 ms — http/1.1https://www.duke.edu/wp-content/plugins/duke-blocks/assets/blocks/core-template-part.css?ver=6.9.4www.duke.edu/wp-content/plugins/duk... https://www.duke.edu/wp-content/plugins/duke-blocks/assets/blocks/core-template-part.css?ver=6.9.4 — 200 — 267 B — 356 ms — http/1.1https://www.duke.edu/wp-includes/blocks/cover/style.min.css?ver=6.9.4www.duke.edu/wp-includes/blocks/cov... https://www.duke.edu/wp-includes/blocks/cover/style.min.css?ver=6.9.4 — 200 — 2.0 KiB — 357 ms — http/1.1https://www.duke.edu/wp-includes/blocks/social-links/style.min.css?ver=6.9.4www.duke.edu/wp-includes/blocks/soc... https://www.duke.edu/wp-includes/blocks/social-links/style.min.css?ver=6.9.4 — 200 — 1.8 KiB — 434 ms — http/1.1https://www.duke.edu/wp-content/plugins/duke-alertbar/public/css/duke-alertbar-public.css?ver=1.0.0www.duke.edu/wp-content/plugins/duk... https://www.duke.edu/wp-content/plugins/duke-alertbar/public/css/duke-alertbar-public.css?ver=1.0.0 — 200 — 420 B — 682 ms — http/1.1https://alertbar.oit.duke.edu/sites/all/themes/blackwell/css/alert.css?ver=1.0.0alertbar.oit.duke.edu/sites/all/the... https://alertbar.oit.duke.edu/sites/all/themes/blackwell/css/alert.css?ver=1.0.0 — 200 — 1.8 KiB — 507 ms — http/1.1https://www.duke.edu/wp-content/themes/duke-block-homepage/assets/styles/styles.css?ver=1.3www.duke.edu/wp-content/themes/duke... https://www.duke.edu/wp-content/themes/duke-block-homepage/assets/styles/styles.css?ver=1.3 — 200 — 79.0 KiB — 1.0 s — http/1.1https://www.duke.edu/wp-content/plugins/duke-blocks/assets/js/duke-blocks-frontend.js?ver=1772484105www.duke.edu/wp-content/plugins/duk... https://www.duke.edu/wp-content/plugins/duke-blocks/assets/js/duke-blocks-frontend.js?ver=1772484105 — 200 — 1.2 KiB — 689 ms — http/1.1https://www.duke.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.1www.duke.edu/wp-includes/js/jquery/... https://www.duke.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 30.0 KiB — 819 ms — http/1.1https://www.duke.edu/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1www.duke.edu/wp-includes/js/jquery/... https://www.duke.edu/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.0 KiB — 707 ms — http/1.1https://www.duke.edu/wp-content/plugins/duke-alertbar/public/js/duke-alertbar-public.js?ver=1.0.0www.duke.edu/wp-content/plugins/duk... https://www.duke.edu/wp-content/plugins/duke-alertbar/public/js/duke-alertbar-public.js?ver=1.0.0 — 200 — 1.2 KiB — 783 ms — http/1.1https://www.duke.edu/wp-content/plugins/duke-blocks/assets/images/duke-wordmark-white.svgwww.duke.edu/wp-content/plugins/duk... https://www.duke.edu/wp-content/plugins/duke-blocks/assets/images/duke-wordmark-white.svg — 200 — 5.2 KiB — 342 ms — http/1.1https://www.duke.edu/wp-content/plugins/duke-blocks/assets/images/dt-logo.svgwww.duke.edu/wp-content/plugins/duk... https://www.duke.edu/wp-content/plugins/duke-blocks/assets/images/dt-logo.svg — 200 — 13.2 KiB — 337 ms — http/1.1https://www.duke.edu/wp-content/plugins/duke-blocks/assets/images/dd-white.svgwww.duke.edu/wp-content/plugins/duk... https://www.duke.edu/wp-content/plugins/duke-blocks/assets/images/dd-white.svg — 200 — 7.0 KiB — 382 ms — http/1.1https://www.duke.edu/wp-content/uploads/2026/02/united-in-spirit-header.jpgwww.duke.edu/wp-content/uploads/202... https://www.duke.edu/wp-content/uploads/2026/02/united-in-spirit-header.jpg — 200 — 251.3 KiB — 1.6 s — http/1.1https://alertbar.oit.duke.edu/alert.htmlalertbar.oit.duke.edu/alert.html https://alertbar.oit.duke.edu/alert.html — 200 — 400 B — 343 ms — http/1.1https://www.duke.edu/wp-content/themes/duke-block-homepage/assets/js/front-end.js?ver=d49a6e163b0c4115ba19www.duke.edu/wp-content/themes/duke... https://www.duke.edu/wp-content/themes/duke-block-homepage/assets/js/front-end.js?ver=d49a6e163b0c4115ba19 — 200 — 2.0 KiB — 758 ms — http/1.1https://www.duke.edu/wp-content/plugins/duke-blocks/build/duke-menu/view.js?ver=2ee6d6e39e96cf0add6bwww.duke.edu/wp-content/plugins/duk... https://www.duke.edu/wp-content/plugins/duke-blocks/build/duke-menu/view.js?ver=2ee6d6e39e96cf0add6b — 200 — 1.3 KiB — 1.1 s — http/1.1https://www.duke.edu/wp-content/plugins/duke-blocks/build/hidden-content/view.js?ver=31d6cfe0d16ae931b73cwww.duke.edu/wp-content/plugins/duk... https://www.duke.edu/wp-content/plugins/duke-blocks/build/hidden-content/view.js?ver=31d6cfe0d16ae931b73c — 200 — 242 B — 1.1 s — http/1.1https://www.duke.edu/wp-content/plugins/duke-blocks/build/section-heading/view.js?ver=f8f2baec9ab8281305fdwww.duke.edu/wp-content/plugins/duk... https://www.duke.edu/wp-content/plugins/duke-blocks/build/section-heading/view.js?ver=f8f2baec9ab8281305fd — 200 — 651 B — 1.1 s — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-PSPVTBKwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PSPVTBK — 200 — 133.2 KiB — 150 ms — h2data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4KPHN2ZyB4bWxucz0iaHR0c…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4KPHN2ZyB4bWxucz0iaHR0c… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PHN2ZyB3aWR0aD0iNjQ3IiBoZWlnaHQ9IjM2MiIgdmlld0JveD0iMCAwIDY0NyAzNjIiIGZpb…data:image/svg+xml;base64,PHN2ZyB3a... data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iNjQ3IiBoZWlnaHQ9IjM2MiIgdmlld0JveD0iMCAwIDY0NyAzNjIiIGZpb… — 200 — 0 B — 1 ms — datahttps://www.duke.edu/wp-content/uploads/2026/02/duke-studens-spirit.jpgwww.duke.edu/wp-content/uploads/202... https://www.duke.edu/wp-content/uploads/2026/02/duke-studens-spirit.jpg — 200 — 591.9 KiB — 1.6 s — http/1.1https://www.duke.edu/wp-content/themes/duke-block-homepage/assets/fonts/quattrocento/Quattrocento-Regular.ttfwww.duke.edu/wp-content/themes/duke... https://www.duke.edu/wp-content/themes/duke-block-homepage/assets/fonts/quattrocento/Quattrocento-Regular.ttf — 200 — 144.5 KiB — 674 ms — http/1.1https://www.duke.edu/wp-content/themes/duke-block-homepage/assets/styles/fonts/duke-icons.8c5c276b.ttfwww.duke.edu/wp-content/themes/duke... https://www.duke.edu/wp-content/themes/duke-block-homepage/assets/styles/fonts/duke-icons.8c5c276b.ttf — 200 — 20.4 KiB — 342 ms — http/1.1
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 3.9 s LCP 14.3 shttps://duke.edu// https://duke.edu/ — 302 — 193 B — 345 ms — http/1.1https://www.duke.edu/www.duke.edu/ https://www.duke.edu/ — 200 — 37.0 KiB — 460 ms — http/1.1https://www.duke.edu/wp-includes/blocks/image/style.min.css?ver=6.9.4www.duke.edu/wp-includes/blocks/ima... https://www.duke.edu/wp-includes/blocks/image/style.min.css?ver=6.9.4 — 200 — 1.8 KiB — 335 ms — http/1.1https://www.duke.edu/wp-includes/blocks/navigation/style.min.css?ver=6.9.4www.duke.edu/wp-includes/blocks/nav... https://www.duke.edu/wp-includes/blocks/navigation/style.min.css?ver=6.9.4 — 200 — 2.5 KiB — 346 ms — http/1.1https://www.duke.edu/wp-content/plugins/duke-blocks/build/duke-menu/style-index.css?ver=0.1.0www.duke.edu/wp-content/plugins/duk... https://www.duke.edu/wp-content/plugins/duke-blocks/build/duke-menu/style-index.css?ver=0.1.0 — 200 — 4.3 KiB — 350 ms — http/1.1https://www.duke.edu/wp-content/plugins/duke-blocks/assets/blocks/core-template-part.css?ver=6.9.4www.duke.edu/wp-content/plugins/duk... https://www.duke.edu/wp-content/plugins/duke-blocks/assets/blocks/core-template-part.css?ver=6.9.4 — 200 — 267 B — 356 ms — http/1.1https://www.duke.edu/wp-includes/blocks/cover/style.min.css?ver=6.9.4www.duke.edu/wp-includes/blocks/cov... https://www.duke.edu/wp-includes/blocks/cover/style.min.css?ver=6.9.4 — 200 — 2.0 KiB — 357 ms — http/1.1https://www.duke.edu/wp-includes/blocks/social-links/style.min.css?ver=6.9.4www.duke.edu/wp-includes/blocks/soc... https://www.duke.edu/wp-includes/blocks/social-links/style.min.css?ver=6.9.4 — 200 — 1.8 KiB — 434 ms — http/1.1https://www.duke.edu/wp-content/plugins/duke-alertbar/public/css/duke-alertbar-public.css?ver=1.0.0www.duke.edu/wp-content/plugins/duk... https://www.duke.edu/wp-content/plugins/duke-alertbar/public/css/duke-alertbar-public.css?ver=1.0.0 — 200 — 420 B — 682 ms — 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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 3784ms · 366KB · $50/mo
www.duke.edu
Other
Costly
Execution 2419ms
Transfer 37 KB
Monthly Cost $32/mo
Unattributable
Other
Costly
Execution 483ms
Transfer 0 KB
Monthly Cost $6/mo
Microsoft Clarity
Session Replay
Costly
Execution 319ms
Transfer 25 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 228ms
Transfer 152 KB
Unused 43%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 222ms
Transfer 133 KB
Unused 47%
Monthly Cost $3/mo
Google Analytics
Analytics
Optional
Execution 59ms
Transfer 17 KB
Monthly Cost $1/mo
www.duke.edu
Other
Optional
Execution 54ms
Transfer 1 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.duke.edu adds 2419ms and costs ~$32/month
  • Unattributable adds 483ms and costs ~$6/month
  • Microsoft Clarity adds 319ms and costs ~$4/month
  • Google Tag Manager adds 228ms and costs ~$3/month
  • Google Tag Manager adds 222ms and costs ~$3/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.duke.edu takes 2419ms 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 483ms 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

Microsoft Clarity takes 319ms 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 228ms 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 222ms 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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