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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

35
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.
96
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.

3.00 s

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

12.08 s

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

1.40 s

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

0.126

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

5.89 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.

13.69 s

Page Load Progression

376 ms
751 ms
1.1 s
1.5 s
1.9 s
2.3 s
2.6 s
3.0 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 196 requests
FIX
3.0 MB transferred, 196 requests
Warning::
Page weighs 7.7 MB (3.0 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Warning::
196 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.63 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
196 requests
0.63 g CO2 per page load
JavaScript 1.2 MiB 38%
Images 1013.8 KiB 33%
Other 589.1 KiB 19%
Fonts 113.3 KiB 4%
Other 97.3 KiB 3%
HTML 72.3 KiB 2%
CSS 9.4 KiB 0%
Other 1.2 KiB 0%
0 2.4 MB 4.9 MB
Over budget

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (3.0 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
9194ms total JS execution
FIX
9194ms total JS execution
Warning::
https://www.udacity.com/_next/static/chunks/framew...: 4500ms CPU time
Warning::
https://www.udacity.com/: 1079ms CPU time
Warning::
Unattributable: 1025ms CPU time
Warning::
https://www.udacity.com/_next/static/chunks/3229-3...: 779ms CPU time
Warning::
https://www.udacity.com/_next/static/chunks/pages/...: 572ms CPU time
Warning::
Third-party scripts: 9194ms (100% of total)

Main Thread Breakdown

Script Evaluation 62% Other 14% Style & Layout 13% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.udacity.com/_next/static/chunks/framework-a4a084c340f1dbf7.js4500ms4029ms21ms3rd
https://www.udacity.com/1079ms39ms1ms3rd
Unattributable1025ms99ms0ms3rd
https://www.udacity.com/_next/static/chunks/3229-30bf7f4be6095d73.js779ms213ms7ms3rd
https://www.udacity.com/_next/static/chunks/pages/_app-84da0d026560cb84.js572ms372ms126ms3rd
https://www.udacity.com/_next/static/chunks/575.5dfea3c445bfbfa7.js241ms208ms0ms3rd
https://transcend-cdn.com/cm/fabf1c8c-2efe-431a-a7f5-bfa47023d804/ui.js170ms142ms27ms3rd
https://www.udacity.com/_next/static/chunks/5174-cf1907ba7c614e80.js156ms78ms77ms3rd
https://transcend-cdn.com/cm/fabf1c8c-2efe-431a-a7f5-bfa47023d804/airgap.js151ms132ms11ms3rd
https://www.udacity.com/_next/static/chunks/pages/index-f42dacd6eaa22f1c.js148ms143ms4ms3rd

Showing top 10 of 14 scripts

F
JS Bundles
Action
90 scripts, 1.6 MB unused
FIX
90 scripts, 1.6 MB unused
Warning::
https://www.udacity.com/_next/static/chunks/c69d65...: 221 KB unused (98%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.udacity.com/_next/static/chunks/c69d65...: 221 KB unused (98%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.udacity.com/_next/static/chunks/pages/...: 109 KB unused (24%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.udacity.com/_next/static/chunks/5018-3...: 95 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.udacity.com/_next/static/chunks/5018-3...: 95 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.6 MB
1590 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.udacity.com/_next/static/chunks/c69d6571-6d901bd5e7db6e28.js51 KB221 KB (98%)3rd
https://www.udacity.com/_next/static/chunks/c69d6571-6d901bd5e7db6e28.js0 KB221 KB (98%)3rd
https://www.udacity.com/_next/static/chunks/pages/_app-84da0d026560cb84.js460 KB109 KB (24%)3rd
https://www.udacity.com/_next/static/chunks/5018-3461c17b2daac868.js50 KB95 KB (49%)3rd
https://www.udacity.com/_next/static/chunks/5018-3461c17b2daac868.js0 KB95 KB (49%)3rd
https://www.udacity.com/_next/static/chunks/5279-ea2a293ac5e932b0.js31 KB91 KB (88%)3rd
https://www.udacity.com/_next/static/chunks/5279-ea2a293ac5e932b0.js0 KB91 KB (88%)3rd
https://www.udacity.com/_next/static/chunks/8843-b6000d988c7ef468.js0 KB86 KB (46%)3rd
https://www.udacity.com/_next/static/chunks/8843-b6000d988c7ef468.js46 KB86 KB (46%)3rd
https://www.udacity.com/_next/static/chunks/906-ca193c8fb5f33db3.js0 KB82 KB (90%)3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

F
Page Weight Inventory
Action
196 resources · 3.0 MB · 1.6 MB savings available
FIX
196 resources · 3.0 MB · 1.6 MB savings available
Warning::
Page weight 2.0 MB over 1MB target
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~1.6 MB of savings available
Warning::
195 third-party resources (100% of weight)
Info::
3 resources over 200KB
196 resources · 3.0 MiB · 195 third-party 2.0 MiB over 1MB target
JavaScript 57% · 1.7 MiB
Image 33% · 1019.5 KiB
Font 4% · 113.3 KiB
Other 3% · 90.2 KiB
Document 2% · 72.3 KiB
CSS 1% · 22.8 KiB

~1.6 MiB of savings available

Remove unused JavaScript: 1.6 MiB
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
64 images, 0 KB saveable
REVIEW
64 images, 0 KB saveable
Info::
All images are well-optimized
64 images 1014 KB
0 oversized -0 KB
28 legacy format
0 missing dimensions CLS risk
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
5 fonts (113 KB)
PASS
5 fonts (113 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

113 KB total

Render-blocking

0

of 5

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 FCP 3.0 s LCP 12.1 shttps://www.udacity.com/_next/static/media/e4af272ccee01ff0-s.p.woff2e4af272ccee01ff0-s.p.woff2 https://www.udacity.com/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 48.0 KiB — 108 ms — font-display: swaphttps://www.udacity.com/_next/static/media/636a5ac981f94f8b-s.p.woff2636a5ac981f94f8b-s.p.woff2 https://www.udacity.com/_next/static/media/636a5ac981f94f8b-s.p.woff2 — 27.0 KiB — 94 ms — font-display: swaphttps://www.udacity.com/_next/static/media/1f54c84255ccf44e-s.p.woff21f54c84255ccf44e-s.p.woff2 https://www.udacity.com/_next/static/media/1f54c84255ccf44e-s.p.woff2 — 14.6 KiB — 53 ms — font-display: swaphttps://www.udacity.com/_next/static/media/3667c091265cf81b-s.p.woff23667c091265cf81b-s.p.woff2 https://www.udacity.com/_next/static/media/3667c091265cf81b-s.p.woff2 — 14.8 KiB — 51 ms — font-display: swaphttps://www.udacity.com/_next/static/media/8ebc6e9dde468c4a-s.woff28ebc6e9dde468c4a-s.woff2 https://www.udacity.com/_next/static/media/8ebc6e9dde468c4a-s.woff2 — 9.0 KiB — 90 ms — font-display: swap
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 108 ms
Start 129 ms
Risk FOUT — text flashes from fallback to web font
636a5ac981f94f8b-s.p.woff2 woff2 swap
Size 27 KB
Load time 94 ms
Start 129 ms
Risk FOUT — text flashes from fallback to web font
1f54c84255ccf44e-s.p.woff2 woff2 swap
Size 15 KB
Load time 53 ms
Start 129 ms
Risk FOUT — text flashes from fallback to web font
3667c091265cf81b-s.p.woff2 woff2 swap
Size 15 KB
Load time 51 ms
Start 130 ms
Risk FOUT — text flashes from fallback to web font
8ebc6e9dde468c4a-s.woff2 woff2 swap
Size 9 KB
Load time 90 ms
Start 368 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
preload
6
dns-prefetch
prefetch

6 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
196 requests over 2764ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.0 s LCP 12.1 shttps://udacity.com// https://udacity.com/ — 301 — 239 B — 11 ms — h2https://www.udacity.com/www.udacity.com/ https://www.udacity.com/ — 200 — 72.3 KiB — 120 ms — h2https://www.udacity.com/_next/image?url=%2Fimages%2Fexperiments%2Fab_plp_redesign_2025%2Fit-worker-with-headphones-mobile.png&w=750&q=100www.udacity.com/_next/image?url=%2F... https://www.udacity.com/_next/image?url=%2Fimages%2Fexperiments%2Fab_plp_redesign_2025%2Fit-worker-with-headphones-mobile.png&w=750&q=100 — 200 — 80.0 KiB — 93 ms — h2https://www.udacity.com/_next/image?url=%2Fimages%2Fexperiments%2Fab_plp_redesign_2025%2Fit-worker-with-headphones-v2.png&w=750&q=100www.udacity.com/_next/image?url=%2F... https://www.udacity.com/_next/image?url=%2Fimages%2Fexperiments%2Fab_plp_redesign_2025%2Fit-worker-with-headphones-v2.png&w=750&q=100 — 200 — 141.3 KiB — 82 ms — h2https://www.udacity.com/_next/static/media/e4af272ccee01ff0-s.p.woff2www.udacity.com/_next/static/media/... https://www.udacity.com/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 48.0 KiB — 108 ms — h2https://www.udacity.com/_next/static/media/636a5ac981f94f8b-s.p.woff2www.udacity.com/_next/static/media/... https://www.udacity.com/_next/static/media/636a5ac981f94f8b-s.p.woff2 — 200 — 27.0 KiB — 94 ms — h2https://www.udacity.com/_next/static/media/1f54c84255ccf44e-s.p.woff2www.udacity.com/_next/static/media/... https://www.udacity.com/_next/static/media/1f54c84255ccf44e-s.p.woff2 — 200 — 14.6 KiB — 53 ms — h2https://www.udacity.com/_next/static/media/3667c091265cf81b-s.p.woff2www.udacity.com/_next/static/media/... https://www.udacity.com/_next/static/media/3667c091265cf81b-s.p.woff2 — 200 — 14.8 KiB — 51 ms — h2https://www.udacity.com/_next/static/css/606cd925211e874e.csswww.udacity.com/_next/static/css/60... https://www.udacity.com/_next/static/css/606cd925211e874e.css — 200 — 1.2 KiB — 55 ms — h2https://www.udacity.com/_next/static/css/537d84e869e40c48.csswww.udacity.com/_next/static/css/53... https://www.udacity.com/_next/static/css/537d84e869e40c48.css — 200 — 4.1 KiB — 55 ms — h2https://transcend-cdn.com/cm/fabf1c8c-2efe-431a-a7f5-bfa47023d804/airgap.jstranscend-cdn.com/cm/fabf1c8c-2efe-... https://transcend-cdn.com/cm/fabf1c8c-2efe-431a-a7f5-bfa47023d804/airgap.js — 200 — 54.1 KiB — 126 ms — h3https://www.udacity.com/_next/static/chunks/webpack-0f83d6ce91e20dca.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/webpack-0f83d6ce91e20dca.js — 200 — 5.4 KiB — 89 ms — h2https://www.udacity.com/_next/static/chunks/framework-a4a084c340f1dbf7.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/framework-a4a084c340f1dbf7.js — 200 — 66.5 KiB — 95 ms — h2https://www.udacity.com/_next/static/chunks/main-5568c60c70629abf.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/main-5568c60c70629abf.js — 200 — 32.8 KiB — 94 ms — h2https://www.udacity.com/_next/static/chunks/pages/_app-84da0d026560cb84.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/pages/_app-84da0d026560cb84.js — 200 — 460.4 KiB — 139 ms — h2https://www.udacity.com/_next/static/chunks/3148a590-1dbf249fc3167555.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/3148a590-1dbf249fc3167555.js — 200 — 70.6 KiB — 108 ms — h2https://www.udacity.com/_next/static/chunks/7515-ca3c6bc643f3bfc3.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/7515-ca3c6bc643f3bfc3.js — 200 — 4.1 KiB — 103 ms — h2https://www.udacity.com/_next/static/chunks/7213-7cdb8fd3e9441f80.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/7213-7cdb8fd3e9441f80.js — 200 — 2.9 KiB — 102 ms — h2https://www.udacity.com/_next/static/chunks/5938-0dd05c910f63b930.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/5938-0dd05c910f63b930.js — 200 — 9.1 KiB — 111 ms — h2https://www.udacity.com/_next/static/chunks/7333-56552984c10f3f98.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/7333-56552984c10f3f98.js — 200 — 42.9 KiB — 113 ms — h2https://www.udacity.com/_next/static/chunks/4300-7d56e2f705e1c793.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/4300-7d56e2f705e1c793.js — 200 — 3.2 KiB — 120 ms — h2https://www.udacity.com/_next/static/chunks/5476-fb133b06b0f57d11.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/5476-fb133b06b0f57d11.js — 200 — 30.0 KiB — 119 ms — h2https://www.udacity.com/_next/static/chunks/4623-e9c01f78eeb19fdd.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/4623-e9c01f78eeb19fdd.js — 200 — 24.9 KiB — 119 ms — h2https://www.udacity.com/_next/static/chunks/9383-7efd5061487b7d92.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/9383-7efd5061487b7d92.js — 200 — 3.1 KiB — 118 ms — h2https://www.udacity.com/_next/static/chunks/3229-30bf7f4be6095d73.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/3229-30bf7f4be6095d73.js — 200 — 30.3 KiB — 129 ms — h2https://www.udacity.com/_next/static/chunks/6920-ccfe6a42f8bb4c07.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/6920-ccfe6a42f8bb4c07.js — 200 — 6.2 KiB — 124 ms — h2https://www.udacity.com/_next/static/chunks/6805-38de4e785561e502.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/6805-38de4e785561e502.js — 200 — 4.6 KiB — 124 ms — h2https://www.udacity.com/_next/static/chunks/3575-2871d5dc73870497.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/3575-2871d5dc73870497.js — 200 — 98.2 KiB — 134 ms — h2https://www.udacity.com/_next/static/chunks/657-c804260a99e48d95.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/657-c804260a99e48d95.js — 200 — 4.7 KiB — 126 ms — h2https://www.udacity.com/_next/static/chunks/7070-2c4aadb98c5ebdd3.jswww.udacity.com/_next/static/chunks... https://www.udacity.com/_next/static/chunks/7070-2c4aadb98c5ebdd3.js — 200 — 16.6 KiB — 127 ms — h2
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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 9194ms · 863KB · €100/mo
www.udacity.com
Other
Costly
Execution 4500ms
Transfer 66 KB
Unused 49%
Monthly Cost €49/mo
www.udacity.com
Other
Costly
Execution 1079ms
Transfer 72 KB
Monthly Cost €12/mo
Unattributable
Other
Costly
Execution 1025ms
Transfer 0 KB
Monthly Cost €11/mo
www.udacity.com
Other
Costly
Execution 779ms
Transfer 30 KB
Monthly Cost €8/mo
www.udacity.com
Other
Costly
Execution 572ms
Transfer 460 KB
Unused 24%
Monthly Cost €6/mo
www.udacity.com
Other
Costly
Execution 241ms
Transfer 1 KB
Monthly Cost €3/mo
transcend-cdn.com
Other
Optional
Execution 170ms
Transfer 90 KB
Unused 50%
Monthly Cost €2/mo
www.udacity.com
Other
Optional
Execution 156ms
Transfer 0 KB
Monthly Cost €2/mo
transcend-cdn.com
Other
Optional
Execution 151ms
Transfer 54 KB
Monthly Cost €2/mo
www.udacity.com
Other
Optional
Execution 148ms
Transfer 13 KB
Monthly Cost €2/mo
www.udacity.com
Other
Optional
Execution 128ms
Transfer 33 KB
Monthly Cost €1/mo
sgmt.udacity.com
Other
Optional
Execution 125ms
Transfer 23 KB
Monthly Cost €1/mo
sgmt.udacity.com
Other
Optional
Execution 65ms
Transfer 1 KB
Monthly Cost €1/mo
Amplitude
Analytics
Optional
Execution 54ms
Transfer 18 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.udacity.com adds 4500ms and costs ~€49/month
  • www.udacity.com adds 1079ms and costs ~€12/month
  • Unattributable adds 1025ms and costs ~€11/month
  • www.udacity.com adds 779ms and costs ~€8/month
  • www.udacity.com adds 572ms and costs ~€6/month
  • www.udacity.com adds 241ms 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.udacity.com takes 4500ms 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.udacity.com takes 1079ms 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 1025ms 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.udacity.com 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.udacity.com takes 572ms 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.udacity.com takes 241ms 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

50% of transcend-cdn.com'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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