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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
82
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.
73
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.

1.10 s

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

2.22 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.

0.000

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

2.24 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.27 s

Page Load Progression

519 ms
1.0 s
1.6 s
2.1 s
2.6 s
3.1 s
3.6 s
4.2 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
36.6 MB transferred, 91 requests
FIX
36.6 MB transferred, 91 requests
Critical::
Page weighs 34.9 MB (36.6 MB transferred)
Warning::
Images are 2.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.4 MB
Info::
Fonts are 433 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 433 KB
Info::
91 HTTP requests
Info::
Estimated 7.7 g CO2 per page load
36.6 MB / 2.4 MB budget
36.6 MB transferred
91 requests
7.7 g CO2 per page load
Other 33.1 MiB 91%
Images 2.4 MiB 7%
Fonts 433.4 KiB 1%
JavaScript 316.0 KiB 1%
CSS 173.8 KiB 0%
Other 96.5 KiB 0%
HTML 20.6 KiB 0%
Other 5.5 KiB 0%
Other 1.1 KiB 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
93% third-party, 0 ms blocking
FIX
93% third-party, 0 ms blocking
Warning::
Third-party code accounts for 93% of page weight (34.0 MiB of 36.6 MiB)
Info::
Third-party blocking time is low (0 ms)
93%
First-party Third-party
D
Page Weight Inventory
Action
91 resources · 36.6 MB · 84 KB savings available
FIX
91 resources · 36.6 MB · 84 KB savings available
Warning::
Page weight 35.6 MB over 1MB target
Got: 36.6 MB Expected: ≤ 1 MB
Info::
~84 KB of savings available
Warning::
45 third-party resources (93% of weight)
Info::
7 resources over 200KB
91 resources · 36.6 MiB · 45 third-party 35.6 MiB over 1MB target
Media 91% · 33.1 MiB
Image 7% · 2.4 MiB
Font 1% · 433.4 KiB
JavaScript 1% · 316.0 KiB
CSS 1% · 243.3 KiB
Other 0% · 32.3 KiB
Document 0% · 20.6 KiB

~83.9 KiB of savings available

Remove unused JavaScript: 83.9 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://american.edu/images/YouBelongAtAU_lockup.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://american.edu/about/images/DepositReminderH... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://american.edu/news/images/D26_298_020-3_2_5... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://american.edu/news/images/26-116_Cment_Spea... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://american.edu/images/clawed-desktop.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://american.edu/images/eagle-homepage-576-525... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://american.edu/images/your-purpose-wordmark.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://american.edu/news/images/Artemis-II-at-the... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://american.edu/customcf/2016-redesign/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://american.edu/images/map-desktop.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 2.4 MB
0 oversized -0 KB
13 legacy format
10 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

B
JS Execution Cost
772ms total JS execution
REVIEW
772ms total JS execution
Info::
https://american.edu/: 236ms CPU time
Info::
Unattributable: 224ms CPU time
Info::
https://american.edu/cdn-cgi/challenge-platform/sc...: 126ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202503.2...: 68ms CPU time
Info::
https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5....: 61ms CPU time
Info::
Third-party scripts: 353ms (46% of total)

Main Thread Breakdown

Script Evaluation 37% Other 35% Style & Layout 16% Rendering 6% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://american.edu/236ms20ms1ms1st
Unattributable224ms14ms0ms3rd
https://american.edu/cdn-cgi/challenge-platform/scripts/jsd/main.js126ms115ms3ms1st
https://cdn.cookielaw.org/scripttemplates/202503.2.0/otBannerSdk.js68ms41ms12ms3rd
https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js61ms30ms1ms3rd
https://american.edu/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js57ms46ms3ms1st
B
JS Bundles
20 scripts, 84 KB unused
REVIEW
20 scripts, 84 KB unused
Warning::
https://cdn.cookielaw.org/scripttemplates/202503.2...: 63 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://american.edu/commonspot/javascript/util.js: 21 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://american.edu/commonspot/javascript/util.js: unminified — 12 KB could be saved
Info::
Total unused JavaScript: 84 KB
84 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.cookielaw.org/scripttemplates/202503.2.0/otBannerSdk.js117 KB63 KB (53%)✓3rd
https://american.edu/commonspot/javascript/util.js31 KB21 KB (70%)✗1st
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js10 KB—✓3rd
https://kit.fontawesome.com/51e409e4f4.js6 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js7 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/jquery-storage-api/1.8.1/jquery.storageapi.min.js2 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/picturefill/3.0.2/picturefill.min.js5 KB—✓3rd
https://american.edu/commonspot/pagemode/always-include-common.js3 KB—✓1st
https://american.edu/commonspot/javascript/lightbox/window_ref.js6 KB—✓1st
https://american.edu/commonspot/javascript/lightbox/overrides.js8 KB—✗1st

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

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
12 fonts (433 KB)
PASS
12 fonts (433 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

433 KB total

Render-blocking

0

of 12

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 2.2 shttps://cloudfront.american.edu/assets/fonts/GT-Walsheim-Bold.woffGT-Walsheim-Bold.woff https://cloudfront.american.edu/assets/fonts/GT-Walsheim-Bold.woff — 0 B — 91 ms — font-display: swaphttps://cloudfront.american.edu/assets/fonts/GT-Walsheim-Bold-Oblique.woffGT-Walsheim-Bold-Obliqu... https://cloudfront.american.edu/assets/fonts/GT-Walsheim-Bold-Oblique.woff — 0 B — 91 ms — font-display: swaphttps://cloudfront.american.edu/assets/fonts/GT-Walsheim-Regular-Oblique.woffGT-Walsheim-Regular-Obl... https://cloudfront.american.edu/assets/fonts/GT-Walsheim-Regular-Oblique.woff — 0 B — 91 ms — font-display: swaphttps://cloudfront.american.edu/assets/fonts/GT-Walsheim-Regular.woffGT-Walsheim-Regular.woff https://cloudfront.american.edu/assets/fonts/GT-Walsheim-Regular.woff — 0 B — 90 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/ionicons/2.0.1/fonts/ionicons.ttf?v=2.0.0ionicons.ttf https://cdnjs.cloudflare.com/ajax/libs/ionicons/2.0.1/fonts/ionicons.ttf?v=2.0.0 — 95.9 KiB — 85 ms — font-display: swaphttps://use.fontawesome.com/releases/v5.2.0/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://use.fontawesome.com/releases/v5.2.0/webfonts/fa-brands-400.woff2 — 63.2 KiB — 73 ms — font-display: swaphttps://cloudfront.american.edu/assets/fonts/GT-Walsheim-Bold.woff2GT-Walsheim-Bold.woff2 https://cloudfront.american.edu/assets/fonts/GT-Walsheim-Bold.woff2 — 48.6 KiB — 16 ms — font-display: swaphttps://cloudfront.american.edu/assets/fonts/GT-Walsheim-Regular.woff2GT-Walsheim-Regular.woff2 https://cloudfront.american.edu/assets/fonts/GT-Walsheim-Regular.woff2 — 46.7 KiB — 21 ms — font-display: swaphttps://cloudfront.american.edu/assets/fonts/GT-Walsheim-Regular-Oblique.woff2GT-Walsheim-Regular-Obl... https://cloudfront.american.edu/assets/fonts/GT-Walsheim-Regular-Oblique.woff2 — 50.4 KiB — 21 ms — font-display: swaphttps://cloudfront.american.edu/assets/fonts/GT-Walsheim-Bold-Oblique.woff2GT-Walsheim-Bold-Obliqu... https://cloudfront.american.edu/assets/fonts/GT-Walsheim-Bold-Oblique.woff2 — 52.1 KiB — 18 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-1.woff2pro-fa-brands-400-1.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-1.woff2 — 39.6 KiB — 36 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-0.woff2pro-fa-brands-400-0.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-0.woff2 — 36.9 KiB — 39 ms — font-display: swap
GT-Walsheim-Bold.woff woff swap
Size 0 KB
Load time 91 ms
Start 851 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
GT-Walsheim-Bold-Obliqu... woff swap
Size 0 KB
Load time 91 ms
Start 851 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
GT-Walsheim-Regular-Obl... woff swap
Size 0 KB
Load time 91 ms
Start 851 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
GT-Walsheim-Regular.woff woff swap
Size 0 KB
Load time 90 ms
Start 851 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
ionicons.ttf unknown swap
Size 96 KB
Load time 85 ms
Start 910 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 63 KB
Load time 73 ms
Start 912 ms
Risk FOUT — text flashes from fallback to web font
GT-Walsheim-Bold.woff2 woff2 swap
Size 49 KB
Load time 16 ms
Start 951 ms
Risk FOUT — text flashes from fallback to web font
GT-Walsheim-Regular.woff2 woff2 swap
Size 47 KB
Load time 21 ms
Start 952 ms
Risk FOUT — text flashes from fallback to web font
GT-Walsheim-Regular-Obl... woff2 swap
Size 50 KB
Load time 21 ms
Start 952 ms
Risk FOUT — text flashes from fallback to web font
GT-Walsheim-Bold-Obliqu... woff2 swap
Size 52 KB
Load time 18 ms
Start 952 ms
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-1.woff2 woff2 swap
Size 40 KB
Load time 36 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-0.woff2 woff2 swap
Size 37 KB
Load time 39 ms
Start 1.2 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)

Fixing the unchecked items could save ~29 KB and ~58 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
91 requests over 1851ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 2.2 shttps://american.edu// https://american.edu/ — 200 — 20.6 KiB — 407 ms — h2https://american.edu/cdn-cgi/speculation/cdn-cgi/speculation https://american.edu/cdn-cgi/speculation — 200 — 230 B — 20 ms — h2https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.cssmaxcdn.bootstrapcdn.com/bootstrap/3... https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css — 200 — 20.4 KiB — 74 ms — h3https://cloudfront.american.edu/assets/css/core/core.csscloudfront.american.edu/assets/css/... https://cloudfront.american.edu/assets/css/core/core.css — 200 — 43.4 KiB — 20 ms — h2https://cloudfront.american.edu/assets/css/core/static.csscloudfront.american.edu/assets/css/... https://cloudfront.american.edu/assets/css/core/static.css — 200 — 14.5 KiB — 21 ms — h2https://cloudfront.american.edu/assets/css/core/interactive.csscloudfront.american.edu/assets/css/... https://cloudfront.american.edu/assets/css/core/interactive.css — 200 — 18.2 KiB — 21 ms — h2https://cloudfront.american.edu/assets/css/core/forms-buttons-loaders.csscloudfront.american.edu/assets/css/... https://cloudfront.american.edu/assets/css/core/forms-buttons-loaders.css — 200 — 13.7 KiB — 24 ms — h2https://use.fontawesome.com/releases/v5.2.0/css/all.cssuse.fontawesome.com/releases/v5.2.0... https://use.fontawesome.com/releases/v5.2.0/css/all.css — 200 — 11.1 KiB — 85 ms — h2https://american.edu/customcf/2016-redesign/css/el-edge-to-edge-bg-container.css?d=20242401/customcf/2016-redesign/css/el-edge... https://american.edu/customcf/2016-redesign/css/el-edge-to-edge-bg-container.css?d=20242401 — 200 — 5.1 KiB — 133 ms — h2https://american.edu/customcf/2016-redesign/css/el-bg-video.css/customcf/2016-redesign/css/el-bg-v... https://american.edu/customcf/2016-redesign/css/el-bg-video.css — 200 — 1.0 KiB — 27 ms — h2https://american.edu/customcf/2016-redesign/css/el-spotlight.css?v=12042024/customcf/2016-redesign/css/el-spot... https://american.edu/customcf/2016-redesign/css/el-spotlight.css?v=12042024 — 200 — 5.9 KiB — 154 ms — h2https://american.edu/customcf/2016-redesign/css/el-flex-grid.css/customcf/2016-redesign/css/el-flex... https://american.edu/customcf/2016-redesign/css/el-flex-grid.css — 200 — 2.7 KiB — 28 ms — h2https://american.edu/customcf/2016-redesign/css/el-flex-news.css/customcf/2016-redesign/css/el-flex... https://american.edu/customcf/2016-redesign/css/el-flex-news.css — 200 — 1.6 KiB — 29 ms — h2https://american.edu/customcf/2016-redesign/css/el-highlight-strip.css/customcf/2016-redesign/css/el-high... https://american.edu/customcf/2016-redesign/css/el-highlight-strip.css — 200 — 1.5 KiB — 28 ms — h2https://american.edu/customcf/2016-redesign/css/2021-rebrand.css?v=20251104/customcf/2016-redesign/css/2021-re... https://american.edu/customcf/2016-redesign/css/2021-rebrand.css?v=20251104 — 200 — 16.3 KiB — 145 ms — h2https://american.edu/customcf/assets/crest-logotype.svg/customcf/assets/crest-logotype.svg https://american.edu/customcf/assets/crest-logotype.svg — 200 — 4.7 KiB — 33 ms — h2https://american.edu/images/mobile-hero.jpg/images/mobile-hero.jpg https://american.edu/images/mobile-hero.jpg — 200 — 32.9 KiB — 31 ms — h2https://american.edu/images/homepage-1920.jpg/images/homepage-1920.jpg https://american.edu/images/homepage-1920.jpg — 200 — 335.6 KiB — 87 ms — h2https://american.edu/images/your-purpose-wordmark.png/images/your-purpose-wordmark.png https://american.edu/images/your-purpose-wordmark.png — 200 — 43.7 KiB — 69 ms — h2https://american.edu/about/images/DepositReminderHomepage_2025.png/about/images/DepositReminderHomepa... https://american.edu/about/images/DepositReminderHomepage_2025.png — 200 — 24.0 KiB — 506 ms — h2https://cloudfront.american.edu/videos/Homepage%20Video%20FINAL.mp4cloudfront.american.edu/videos/Home... https://cloudfront.american.edu/videos/Homepage%20Video%20FINAL.mp4 — 206 — 33.1 MiB — 11 ms — h2https://cdnjs.cloudflare.com/ajax/libs/ionicons/2.0.1/css/ionicons.min.csscdnjs.cloudflare.com/ajax/libs/ioni... https://cdnjs.cloudflare.com/ajax/libs/ionicons/2.0.1/css/ionicons.min.css — 200 — 7.1 KiB — 49 ms — h3https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.cssstackpath.bootstrapcdn.com/font-awe... https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css — 200 — 7.3 KiB — 51 ms — h3https://american.edu/about/images/clawed5-2.jpg/about/images/clawed5-2.jpg https://american.edu/about/images/clawed5-2.jpg — 200 — 153.2 KiB — 203 ms — h3https://american.edu/news/images/26-116_Cment_Speakers_Spr_2026_1200x630_5589884_600x315.png/news/images/26-116_Cment_Speakers_... https://american.edu/news/images/26-116_Cment_Speakers_Spr_2026_1200x630_5589884_600x315.png — 200 — 41.6 KiB — 140 ms — h3https://american.edu/news/images/Artemis-II-at-the-pad-Full-Snow-Moon-02012026_4~large_5589884_600x315.jpg/news/images/Artemis-II-at-the-pad-... https://american.edu/news/images/Artemis-II-at-the-pad-Full-Snow-Moon-02012026_4~large_5589884_600x315.jpg — 200 — 14.7 KiB — 115 ms — h3https://american.edu/news/images/D26_298_020-3_2_5589884_600x315.JPG/news/images/D26_298_020-3_2_558988... https://american.edu/news/images/D26_298_020-3_2_5589884_600x315.JPG — 200 — 52.7 KiB — 145 ms — h3https://american.edu/customcf/assets/2021-images/community.jpg/customcf/assets/2021-images/commun... https://american.edu/customcf/assets/2021-images/community.jpg — 200 — 166.0 KiB — 207 ms — h3https://american.edu/customcf/assets/2021-images/playground.jpg/customcf/assets/2021-images/playgr... https://american.edu/customcf/assets/2021-images/playground.jpg — 200 — 229.1 KiB — 211 ms — h3https://american.edu/customcf/assets/2021-images/lab.jpg/customcf/assets/2021-images/lab.jp... https://american.edu/customcf/assets/2021-images/lab.jpg — 200 — 134.5 KiB — 207 ms — h3
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 2.2 shttps://american.edu// https://american.edu/ — 200 — 20.6 KiB — 407 ms — h2https://american.edu/cdn-cgi/speculation/cdn-cgi/speculation https://american.edu/cdn-cgi/speculation — 200 — 230 B — 20 ms — h2https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.cssmaxcdn.bootstrapcdn.com/bootstrap/3... https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css — 200 — 20.4 KiB — 74 ms — h3https://cloudfront.american.edu/assets/css/core/core.csscloudfront.american.edu/assets/css/... https://cloudfront.american.edu/assets/css/core/core.css — 200 — 43.4 KiB — 20 ms — h2https://cloudfront.american.edu/assets/css/core/static.csscloudfront.american.edu/assets/css/... https://cloudfront.american.edu/assets/css/core/static.css — 200 — 14.5 KiB — 21 ms — h2https://cloudfront.american.edu/assets/css/core/interactive.csscloudfront.american.edu/assets/css/... https://cloudfront.american.edu/assets/css/core/interactive.css — 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
46% of JavaScript execution is third-party
First-party Third-party 353ms · 145KB · $5/mo
Unattributable
Other
Costly
Execution 224ms
Transfer 0 KB
Monthly Cost $3/mo
OneTrust
Consent
Essential
Execution 68ms
Transfer 117 KB
Unused 53%
Monthly Cost $1/mo
cdnjs
CDN
Optional
Execution 61ms
Transfer 28 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 224ms and costs ~$3/month

46% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 224ms 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

53% of OneTrust'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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