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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
44
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.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

3.41 s

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

13.56 s

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

601 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.

11.95 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.

13.58 s

Page Load Progression

1.1 s
2.1 s
3.2 s
4.3 s
5.3 s
6.4 s
7.5 s
8.5 s
Checks
17
8 PASS 1 REVIEW 6 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 43 requests
FIX
2.3 MB transferred, 43 requests
Info::
Page weighs 4.7 MB (2.3 MB transferred)
Info::
Fonts are 1.0 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.0 MB
Warning::
JavaScript is 865 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 865 KB
Info::
43 HTTP requests
Info::
Estimated 0.48 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
43 requests
0.48 g CO2 per page load
Fonts 1.0 MiB 44%
JavaScript 865.0 KiB 37%
Images 296.4 KiB 13%
CSS 108.4 KiB 5%
HTML 21.8 KiB 1%
Other 3.8 KiB 0%
Other 1.2 KiB 0%
Other 842 B 0%
Other 558 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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 (2.3 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2538ms total JS execution
FIX
2538ms total JS execution
Warning::
https://www.sei.cmu.edu/static/assets/main-8td4Fy7...: 779ms CPU time
Warning::
https://www.sei.cmu.edu/divisions/cert/: 672ms CPU time
Warning::
Unattributable: 514ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-87WE...: 300ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-M62...: 220ms CPU time
Warning::
Third-party scripts: 2538ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 26% Style & Layout 15% Script Parsing & Compilation 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.sei.cmu.edu/static/assets/main-8td4Fy72.js779ms735ms5ms3rd
https://www.sei.cmu.edu/divisions/cert/672ms7ms2ms3rd
Unattributable514ms10ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-87WECW6HCS&cx=c&gtm=4e64k1300ms243ms38ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M62LG9220ms157ms40ms3rd
https://www.sei.cmu.edu/static/katex/katex.min.js52ms36ms16ms3rd
D
JS Bundles
Action
10 scripts, 355 KB unused
FIX
10 scripts, 355 KB unused
Warning::
https://www.sei.cmu.edu/static/assets/main-8td4Fy7...: 195 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-87WE...: 69 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-M62...: 67 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.sei.cmu.edu/static/katex/katex.min.js: 24 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 355 KB
355 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.sei.cmu.edu/static/assets/main-8td4Fy72.js421 KB195 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-87WECW6HCS&cx=c&gtm=4e64k1175 KB69 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M62LG9164 KB67 KB (41%)✓3rd
https://www.sei.cmu.edu/static/katex/katex.min.js64 KB24 KB (37%)✓3rd
https://www.sei.cmu.edu/static/assets/dist-CnRPR7bd.js4 KB—✓3rd
https://www.sei.cmu.edu/static/katex/katex_frontend_renderer.js1 KB—✓3rd
https://analytics.silktide.com/a7d70b917ed89a9539b8a77ac24e9c2d.js16 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js?did=019be73c-d868-70bc-b77b-5f776640ec390 KB—✓3rd
https://snap.licdn.com/li.lms-analytics/insight.min.js19 KB—✓3rd
https://px4.ads.linkedin.com/collect?v=2&fmt=js&pid=13415&time=1776897595065&url=https%3A%2F%2Fwww.sei.cmu.edu%2Fdivisions%2Fcert%2F&e_ipv6=AQLsT8H-UfEaIwAAAZ23WZd7AqEDcUyHLj_k5qjyodvWOUyh3gXmBI2AQvR4y_GIj9cj8uiW7HTU1 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

D
Page Weight Inventory
Action
43 resources · 2.3 MB · 355 KB savings available
FIX
43 resources · 2.3 MB · 355 KB savings available
Warning::
Page weight 1.3 MB over 1MB target
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~355 KB of savings available
Warning::
42 third-party resources (100% of weight)
Info::
4 resources over 200KB
43 resources · 2.3 MiB · 42 third-party 1.3 MiB over 1MB target
Font 44% · 1.0 MiB
JavaScript 37% · 865.0 KiB
Image 13% · 298.8 KiB
CSS 5% · 108.4 KiB
Document 1% · 22.3 KiB
Other 0% · 3.5 KiB

~355.0 KiB of savings available

Remove unused JavaScript: 355.0 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
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
Image Optimization
7 images, 0 KB saveable
PASS
7 images, 0 KB saveable
Info::
All images are well-optimized
7 images 296 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
8 fonts (1032 KB)
PASS
8 fonts (1032 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

1032 KB total

Render-blocking

0

of 8

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 3.4 s LCP 13.6 shttps://www.sei.cmu.edu/static/open-sans/open-sans-latin-400.woff2open-sans-latin-400.woff2 https://www.sei.cmu.edu/static/open-sans/open-sans-latin-400.woff2 — 14.5 KiB — 984 ms — font-display: swaphttps://www.sei.cmu.edu/static/open-sans/open-sans-latin-300.woff2open-sans-latin-300.woff2 https://www.sei.cmu.edu/static/open-sans/open-sans-latin-300.woff2 — 15.0 KiB — 984 ms — font-display: swaphttps://www.sei.cmu.edu/static/open-sans/open-sans-latin-700.woff2open-sans-latin-700.woff2 https://www.sei.cmu.edu/static/open-sans/open-sans-latin-700.woff2 — 15.2 KiB — 984 ms — font-display: swaphttps://www.sei.cmu.edu/static/open-sans/open-sans-latin-800.woff2open-sans-latin-800.woff2 https://www.sei.cmu.edu/static/open-sans/open-sans-latin-800.woff2 — 15.2 KiB — 1.0 s — font-display: swaphttps://www.sei.cmu.edu/static/open-sans/open-sans-latin-600.woff2open-sans-latin-600.woff2 https://www.sei.cmu.edu/static/open-sans/open-sans-latin-600.woff2 — 15.1 KiB — 1.1 s — font-display: swaphttps://www.sei.cmu.edu/static/fontawesome/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.sei.cmu.edu/static/fontawesome/webfonts/fa-regular-400.woff2 — 336.0 KiB — 5.8 s — font-display: swaphttps://www.sei.cmu.edu/static/fontawesome/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.sei.cmu.edu/static/fontawesome/webfonts/fa-solid-900.woff2 — 261.3 KiB — 5.5 s — font-display: swaphttps://www.sei.cmu.edu/static/fontawesome/webfonts/fa-light-300.woff2fa-light-300.woff2 https://www.sei.cmu.edu/static/fontawesome/webfonts/fa-light-300.woff2 — 359.7 KiB — 5.9 s — font-display: swap
open-sans-latin-400.woff2 woff2 swap
Size 15 KB
Load time 984 ms
Start 2.4 s
Risk FOUT — text flashes from fallback to web font
open-sans-latin-300.woff2 woff2 swap
Size 15 KB
Load time 984 ms
Start 2.4 s
Risk FOUT — text flashes from fallback to web font
open-sans-latin-700.woff2 woff2 swap
Size 15 KB
Load time 984 ms
Start 2.4 s
Risk FOUT — text flashes from fallback to web font
open-sans-latin-800.woff2 woff2 swap
Size 15 KB
Load time 1.0 s
Start 2.4 s
Risk FOUT — text flashes from fallback to web font
open-sans-latin-600.woff2 woff2 swap
Size 15 KB
Load time 1.1 s
Start 2.4 s
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 336 KB
Load time 5.8 s
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-solid-900.woff2 woff2 swap
Size 261 KB
Load time 5.5 s
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-light-300.woff2 woff2 swap
Size 360 KB
Load time 5.9 s
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
  • 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 ~478 KB and ~956 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
Network Waterfall
43 requests over 8866ms
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 3.4 s LCP 13.6 shttps://cert.org// https://cert.org/ — 301 — 137 B — 322 ms — http/1.0https://www.sei.cmu.edu/certsite/www.sei.cmu.edu/certsite/ https://www.sei.cmu.edu/certsite/ — 301 — 474 B — 328 ms — h2http://www.sei.cmu.edu/divisions/cert/www.sei.cmu.edu/divisions/cert/ http://www.sei.cmu.edu/divisions/cert/ — 307 — 0 B — 0 ms — http/1.1https://www.sei.cmu.edu/divisions/cert/www.sei.cmu.edu/divisions/cert/ https://www.sei.cmu.edu/divisions/cert/ — 200 — 21.8 KiB — 370 ms — h2https://www.sei.cmu.edu/static/katex/katex.min.csswww.sei.cmu.edu/static/katex/katex.... https://www.sei.cmu.edu/static/katex/katex.min.css — 200 — 3.5 KiB — 206 ms — h2https://www.sei.cmu.edu/static/assets/main-B5gbO6no.csswww.sei.cmu.edu/static/assets/main-... https://www.sei.cmu.edu/static/assets/main-B5gbO6no.css — 200 — 97.2 KiB — 1.5 s — h2https://www.sei.cmu.edu/static/assets/main-8td4Fy72.jswww.sei.cmu.edu/static/assets/main-... https://www.sei.cmu.edu/static/assets/main-8td4Fy72.js — 200 — 420.8 KiB — 6.4 s — h2https://www.sei.cmu.edu/static/assets/dist-CnRPR7bd.jswww.sei.cmu.edu/static/assets/dist-... https://www.sei.cmu.edu/static/assets/dist-CnRPR7bd.js — 200 — 4.4 KiB — 204 ms — h2https://www.sei.cmu.edu/static/katex/katex.min.jswww.sei.cmu.edu/static/katex/katex.... https://www.sei.cmu.edu/static/katex/katex.min.js — 200 — 64.4 KiB — 1.5 s — h2https://www.sei.cmu.edu/static/katex/katex_frontend_renderer.jswww.sei.cmu.edu/static/katex/katex_... https://www.sei.cmu.edu/static/katex/katex_frontend_renderer.js — 200 — 811 B — 519 ms — h2https://analytics.silktide.com/a7d70b917ed89a9539b8a77ac24e9c2d.jsanalytics.silktide.com/a7d70b917ed8... https://analytics.silktide.com/a7d70b917ed89a9539b8a77ac24e9c2d.js — 200 — 16.4 KiB — 176 ms — h2https://www.sei.cmu.edu/static/fontawesome/css/regular.min.csswww.sei.cmu.edu/static/fontawesome/... https://www.sei.cmu.edu/static/fontawesome/css/regular.min.css — 200 — 758 B — 300 ms — h2https://www.sei.cmu.edu/static/fontawesome/css/solid.min.csswww.sei.cmu.edu/static/fontawesome/... https://www.sei.cmu.edu/static/fontawesome/css/solid.min.css — 200 — 774 B — 300 ms — h2https://www.sei.cmu.edu/static/fontawesome/css/brands.min.csswww.sei.cmu.edu/static/fontawesome/... https://www.sei.cmu.edu/static/fontawesome/css/brands.min.css — 200 — 5.4 KiB — 401 ms — h2https://www.sei.cmu.edu/static/fontawesome/css/light.min.csswww.sei.cmu.edu/static/fontawesome/... https://www.sei.cmu.edu/static/fontawesome/css/light.min.css — 200 — 883 B — 299 ms — h2https://www.sei.cmu.edu/media/images/fullbleed_full_About_Division.max-1920x1920.format-webp.webpwww.sei.cmu.edu/media/images/fullbl... https://www.sei.cmu.edu/media/images/fullbleed_full_About_Division.max-1920x1920.format-webp.webp — 200 — 126.7 KiB — 5.9 s — h2data:image/svg+xml;utf8,<svg width='15' height='11' viewBox='0 0 17 13' xmlns='http://www.w3.org/20…www.w3.org/20… data:image/svg+xml;utf8,<svg width='15' height='11' viewBox='0 0 17 13' xmlns='http://www.w3.org/20… — 200 — 0 B — 0 ms — datahttps://www.sei.cmu.edu/media/images/Greg-Touhill.height-661.format-webp.webpwww.sei.cmu.edu/media/images/Greg-T... https://www.sei.cmu.edu/media/images/Greg-Touhill.height-661.format-webp.webp — 200 — 106.5 KiB — 4.1 s — h2https://www.sei.cmu.edu/media/images/Wilson_William_324_200113.360x36.height-661.format-webp.webpwww.sei.cmu.edu/media/images/Wilson... https://www.sei.cmu.edu/media/images/Wilson_William_324_200113.360x36.height-661.format-webp.webp — 200 — 30.8 KiB — 2.4 s — h2https://www.sei.cmu.edu/media/images/inacio-chris-96_2622.height-661.format-webp.webpwww.sei.cmu.edu/media/images/inacio... https://www.sei.cmu.edu/media/images/inacio-chris-96_2622.height-661.format-webp.webp — 200 — 31.3 KiB — 3.3 s — h2https://www.sei.cmu.edu/static/open-sans/open-sans-latin-400.woff2www.sei.cmu.edu/static/open-sans/op... https://www.sei.cmu.edu/static/open-sans/open-sans-latin-400.woff2 — 200 — 14.5 KiB — 984 ms — h2https://www.sei.cmu.edu/static/open-sans/open-sans-latin-300.woff2www.sei.cmu.edu/static/open-sans/op... https://www.sei.cmu.edu/static/open-sans/open-sans-latin-300.woff2 — 200 — 15.0 KiB — 984 ms — h2https://www.sei.cmu.edu/static/open-sans/open-sans-latin-700.woff2www.sei.cmu.edu/static/open-sans/op... https://www.sei.cmu.edu/static/open-sans/open-sans-latin-700.woff2 — 200 — 15.2 KiB — 984 ms — h2https://www.sei.cmu.edu/static/open-sans/open-sans-latin-800.woff2www.sei.cmu.edu/static/open-sans/op... https://www.sei.cmu.edu/static/open-sans/open-sans-latin-800.woff2 — 200 — 15.2 KiB — 1.0 s — h2https://www.sei.cmu.edu/static/open-sans/open-sans-latin-600.woff2www.sei.cmu.edu/static/open-sans/op... https://www.sei.cmu.edu/static/open-sans/open-sans-latin-600.woff2 — 200 — 15.1 KiB — 1.1 s — h2https://www.googletagmanager.com/gtm.js?id=GTM-M62LG9www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-M62LG9 — 200 — 164.3 KiB — 209 ms — h2https://www.sei.cmu.edu/static/fontawesome/webfonts/fa-regular-400.woff2www.sei.cmu.edu/static/fontawesome/... https://www.sei.cmu.edu/static/fontawesome/webfonts/fa-regular-400.woff2 — 200 — 336.0 KiB — 5.8 s — h2https://www.sei.cmu.edu/static/fontawesome/webfonts/fa-solid-900.woff2www.sei.cmu.edu/static/fontawesome/... https://www.sei.cmu.edu/static/fontawesome/webfonts/fa-solid-900.woff2 — 200 — 261.3 KiB — 5.5 s — h2https://www.sei.cmu.edu/static/fontawesome/webfonts/fa-light-300.woff2www.sei.cmu.edu/static/fontawesome/... https://www.sei.cmu.edu/static/fontawesome/webfonts/fa-light-300.woff2 — 200 — 359.7 KiB — 5.9 s — h2https://www.googletagmanager.com/gtag/js?id=G-87WECW6HCS&cx=c&gtm=4e64k1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-87WECW6HCS&cx=c&gtm=4e64k1 — 200 — 175.3 KiB — 68 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 3.4 s LCP 13.6 shttps://cert.org// https://cert.org/ — 301 — 137 B — 322 ms — http/1.0https://www.sei.cmu.edu/certsite/www.sei.cmu.edu/certsite/ https://www.sei.cmu.edu/certsite/ — 301 — 474 B — 328 ms — h2http://www.sei.cmu.edu/divisions/cert/www.sei.cmu.edu/divisions/cert/ http://www.sei.cmu.edu/divisions/cert/ — 307 — 0 B — 0 ms — http/1.1https://www.sei.cmu.edu/divisions/cert/www.sei.cmu.edu/divisions/cert/ https://www.sei.cmu.edu/divisions/cert/ — 200 — 21.8 KiB — 370 ms — h2https://www.sei.cmu.edu/static/katex/katex.min.csswww.sei.cmu.edu/static/katex/katex.... https://www.sei.cmu.edu/static/katex/katex.min.css — 200 — 3.5 KiB — 206 ms — h2https://www.sei.cmu.edu/static/assets/main-B5gbO6no.csswww.sei.cmu.edu/static/assets/main-... https://www.sei.cmu.edu/static/assets/main-B5gbO6no.css — 200 — 97.2 KiB — 1.5 s — h2https://www.sei.cmu.edu/static/assets/main-8td4Fy72.jswww.sei.cmu.edu/static/assets/main-... 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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 2538ms · 847KB · $34/mo
www.sei.cmu.edu
Other
Costly
Execution 779ms
Transfer 421 KB
Unused 46%
Monthly Cost $10/mo
www.sei.cmu.edu
Other
Costly
Execution 672ms
Transfer 22 KB
Monthly Cost $9/mo
Unattributable
Other
Costly
Execution 514ms
Transfer 0 KB
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 300ms
Transfer 175 KB
Unused 40%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 220ms
Transfer 164 KB
Unused 41%
Monthly Cost $3/mo
www.sei.cmu.edu
Other
Optional
Execution 52ms
Transfer 64 KB
Unused 37%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.sei.cmu.edu adds 779ms and costs ~$10/month
  • www.sei.cmu.edu adds 672ms and costs ~$9/month
  • Unattributable adds 514ms and costs ~$7/month
  • Google Tag Manager adds 300ms and costs ~$4/month
  • Google Tag Manager adds 220ms 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.sei.cmu.edu takes 779ms 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

www.sei.cmu.edu takes 672ms 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 514ms 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 300ms 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 220ms 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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