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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
56
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.
69
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.

6.03 s

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

13.87 s

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

136 ms

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

0.033

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

8.44 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.

14.10 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
8 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
37.1 MB transferred, 90 requests
FIX
37.1 MB transferred, 90 requests
Critical::
Page weighs 35.6 MB (37.1 MB transferred)
Warning::
Images are 3.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.1 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::
90 HTTP requests
Info::
Estimated 7.8 g CO2 per page load
37.1 MB / 2.4 MB budget
37.1 MB transferred
90 requests
7.8 g CO2 per page load
Other 33.1 MiB 89%
Images 3.1 MiB 8%
Fonts 433.4 KiB 1%
JavaScript 316.1 KiB 1%
CSS 173.8 KiB 0%
Other 96.4 KiB 0%
HTML 20.5 KiB 0%
Other 5.1 KiB 0%
Other 1.7 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
91% third-party, 0 ms blocking
FIX
91% third-party, 0 ms blocking
Warning::
Third-party code accounts for 91% of page weight (34.0 MiB of 37.1 MiB)
Info::
Third-party blocking time is low (0 ms)
91%
First-party Third-party
D
JS Execution Cost
Action
2920ms total JS execution
FIX
2920ms total JS execution
Warning::
Unattributable: 1022ms CPU time
Warning::
https://american.edu/: 543ms CPU time
Warning::
https://american.edu/cdn-cgi/challenge-platform/sc...: 470ms CPU time
Warning::
https://cdn.cookielaw.org/scripttemplates/202503.2...: 309ms CPU time
Warning::
https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5....: 301ms CPU time
Warning::
Third-party scripts: 1694ms (58% of total)

Main Thread Breakdown

Other 39% Script Evaluation 37% Style & Layout 14% Script Parsing & Compilation 4% Rendering 3% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable1022ms51ms0ms3rd
https://american.edu/543ms42ms2ms1st
https://american.edu/cdn-cgi/challenge-platform/scripts/jsd/main.js470ms420ms14ms1st
https://cdn.cookielaw.org/scripttemplates/202503.2.0/otBannerSdk.js309ms168ms40ms3rd
https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js301ms149ms10ms3rd
https://american.edu/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js212ms166ms8ms1st
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451662ms37ms2ms3rd
D
Page Weight Inventory
Action
90 resources · 37.1 MB · 84 KB savings available
FIX
90 resources · 37.1 MB · 84 KB savings available
Warning::
Page weight 36.1 MB over 1MB target
Got: 37.1 MB Expected: ≤ 1 MB
Info::
~84 KB of savings available
Warning::
45 third-party resources (91% of weight)
Info::
4 resources over 200KB
90 resources · 37.1 MiB · 45 third-party 36.1 MiB over 1MB target
Media 89% · 33.1 MiB
Image 8% · 3.1 MiB
Font 1% · 433.4 KiB
JavaScript 1% · 316.1 KiB
CSS 1% · 243.3 KiB
Other 0% · 32.5 KiB
Document 0% · 20.5 KiB

~83.8 KiB of savings available

Remove unused JavaScript: 83.8 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
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Warning::
https://american.edu/customcf/assets/crest-logotyp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://american.edu/about/images/clawed5-2.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://american.edu/images/mobile-hero.jpg 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/images/map-mobile.png 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/about/images/DepositReminderM... 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/customcf/2016-redesign/images... 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/images/YouBelongAtAU_lockup.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://american.edu/images/clawed-mobile.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 3.1 MB
0 oversized -0 KB
15 legacy format
12 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

B
JS Bundles
20 scripts, 84 KB unused
REVIEW
20 scripts, 84 KB unused
Warning::
https://cdn.cookielaw.org/scripttemplates/202503.2...: 62 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 KB62 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 6.0 s LCP 13.9 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 — 69 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 — 68 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 — 68 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 — 69 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 — 89 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 — 81 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 — 6 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 — 12 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 — 15 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 — 14 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 — 39.5 KiB — 35 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 — 37.0 KiB — 32 ms — font-display: swap
GT-Walsheim-Bold.woff woff swap
Size 0 KB
Load time 69 ms
Start 1.3 s
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 68 ms
Start 1.3 s
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 68 ms
Start 1.3 s
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 69 ms
Start 1.3 s
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 89 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 63 KB
Load time 81 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
GT-Walsheim-Bold-Obliqu... woff2 swap
Size 52 KB
Load time 6 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
GT-Walsheim-Regular-Obl... woff2 swap
Size 50 KB
Load time 12 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
GT-Walsheim-Bold.woff2 woff2 swap
Size 49 KB
Load time 15 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
GT-Walsheim-Regular.woff2 woff2 swap
Size 47 KB
Load time 14 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-1.woff2 woff2 swap
Size 40 KB
Load time 35 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-0.woff2 woff2 swap
Size 37 KB
Load time 32 ms
Start 1.8 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+
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
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
90 requests over 2689ms
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 6.0 s LCP 13.9 shttps://american.edu// https://american.edu/ — 200 — 20.5 KiB — 317 ms — h2https://american.edu/cdn-cgi/speculation/cdn-cgi/speculation https://american.edu/cdn-cgi/speculation — 200 — 867 B — 24 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 — 100 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 — 167 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 — 175 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 — 171 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 — 169 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 — 117 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 — 130 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 — 1008 B — 33 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 — 132 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 — 2.8 KiB — 27 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 — 31 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 — 29 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 — 138 ms — h2https://american.edu/customcf/assets/crest-logotype.svg/customcf/assets/crest-logotype.svg https://american.edu/customcf/assets/crest-logotype.svg — 200 — 4.8 KiB — 37 ms — h2https://american.edu/images/mobile-hero.jpg/images/mobile-hero.jpg https://american.edu/images/mobile-hero.jpg — 200 — 32.9 KiB — 35 ms — h2https://american.edu/images/homepage-1920.jpg/images/homepage-1920.jpg https://american.edu/images/homepage-1920.jpg — 200 — 335.6 KiB — 85 ms — h2https://american.edu/images/your-purpose-wordmark.png/images/your-purpose-wordmark.png https://american.edu/images/your-purpose-wordmark.png — 200 — 43.6 KiB — 65 ms — h2https://american.edu/about/images/DepositReminderMobile_2025.png/about/images/DepositReminderMobile... https://american.edu/about/images/DepositReminderMobile_2025.png — 200 — 18.1 KiB — 68 ms — h2https://american.edu/about/images/clawed5-2.jpg/about/images/clawed5-2.jpg https://american.edu/about/images/clawed5-2.jpg — 200 — 153.2 KiB — 86 ms — h2https://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 — 41.5 KiB — 38 ms — h2https://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 — 14.6 KiB — 70 ms — h2https://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 — 52.6 KiB — 73 ms — h2https://american.edu/customcf/assets/2021-images/community_m.jpg/customcf/assets/2021-images/commun... 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Per-script blocking time, transfer cost, and cache headers
INFO
58% of JavaScript execution is third-party
First-party Third-party 1694ms · 156KB · $22/mo
Unattributable
Other
Costly
Execution 1022ms
Transfer 0 KB
Monthly Cost $14/mo
OneTrust
Consent
Essential
Execution 309ms
Transfer 117 KB
Unused 53%
Monthly Cost $4/mo
cdnjs
CDN
Costly
Execution 301ms
Transfer 28 KB
Monthly Cost $4/mo
static.cloudflareinsights.com
Other
Optional
Execution 62ms
Transfer 11 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1022ms and costs ~$14/month
  • cdnjs adds 301ms and costs ~$4/month

58% 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.

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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 1022ms 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

cdnjs takes 301ms 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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