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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
16
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.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

7.62 s

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

12.29 s

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

760 ms

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

0.744

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

7.62 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.

12.45 s

Page Load Progression

430 ms
860 ms
1.3 s
1.7 s
2.1 s
2.6 s
3.0 s
3.4 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
4.1 MB transferred, 135 requests
FIX
4.1 MB transferred, 135 requests
Critical::
Page weighs 7.3 MB (4.1 MB transferred)
Warning::
Images are 2.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.6 MB
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::
135 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.87 g CO2 per page load
4.1 MB / 2.4 MB budget
4.1 MB transferred
135 requests
0.87 g CO2 per page load
Images 2.6 MiB 62%
JavaScript 1.2 MiB 28%
Fonts 164.0 KiB 4%
Other 146.6 KiB 3%
HTML 65.3 KiB 2%
CSS 11.3 KiB 0%
Other 2.6 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

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 (4.1 MiB of 4.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4077ms total JS execution
FIX
4077ms total JS execution
Warning::
https://cdn.kastatic.org/khanacademy/khanacademy.4...: 2148ms CPU time
Warning::
https://www.khanacademy.org/: 762ms CPU time
Warning::
Unattributable: 631ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202310.2...: 212ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WSX...: 164ms CPU time
Warning::
Third-party scripts: 4077ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 21% Style & Layout 11% Script Parsing & Compilation 8% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://cdn.kastatic.org/khanacademy/khanacademy.47960f894ea35774.js2148ms1684ms196ms3rd
https://www.khanacademy.org/762ms36ms36ms3rd
Unattributable631ms123ms0ms3rd
https://cdn.cookielaw.org/scripttemplates/202310.2.0/otBannerSdk.js212ms136ms30ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WSX5PBP164ms128ms35ms3rd
https://cdn.kastatic.org/khanacademy/62538.3c089e819b2f9b6e.js160ms136ms6ms3rd
F
JS Bundles
Action
24 scripts, 577 KB unused
FIX
24 scripts, 577 KB unused
Warning::
https://cdn.kastatic.org/khanacademy/khanacademy.4...: 437 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WSX...: 86 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202310.2...: 54 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 577 KB
577 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.kastatic.org/khanacademy/khanacademy.47960f894ea35774.js771 KB437 KB (57%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WSX5PBP153 KB86 KB (57%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202310.2.0/otBannerSdk.js103 KB54 KB (52%)✓3rd
https://cdn.kastatic.org/khanacademy/51368.fafd57f2e86b4e50.js3 KB—✓3rd
https://cdn.kastatic.org/khanacademy/13065.66f345756c35f432.js2 KB—✓3rd
https://cdn.kastatic.org/khanacademy/4521.e823749d0195f971.js2 KB—✓3rd
https://cdn.kastatic.org/khanacademy/73950.aabeead257a16f5d.js5 KB—✓3rd
https://cdn.kastatic.org/khanacademy/31195.3b4d841badc817a0.js2 KB—✓3rd
https://cdn.kastatic.org/khanacademy/42157.d185f0a3e4c50a8c.js17 KB—✓3rd
https://cdn.kastatic.org/khanacademy/31495.5bbcddcc1b6c5719.js3 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

F
Page Weight Inventory
Action
135 resources · 4.1 MB · 577 KB savings available
FIX
135 resources · 4.1 MB · 577 KB savings available
Warning::
Page weight 3.1 MB over 1MB target
Got: 4.1 MB Expected: ≤ 1 MB
Info::
~577 KB of savings available
Warning::
134 third-party resources (100% of weight)
Info::
5 resources over 200KB
135 resources · 4.1 MiB · 134 third-party 3.1 MiB over 1MB target
Image 63% · 2.6 MiB
JavaScript 28% · 1.2 MiB
Font 4% · 164.0 KiB
Other 3% · 144.9 KiB
Document 2% · 65.7 KiB
CSS 0% · 15.2 KiB

~577.1 KiB of savings available

Remove unused JavaScript: 577.1 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
61 images, 0 KB saveable
REVIEW
61 images, 0 KB saveable
Warning::
https://cdn.kastatic.org/images/lohp/trusted_conte... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://tools.applemediaservices.com/api/badges/do... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.kastatic.org/images/lohp/personalized_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.kastatic.org/images/lohp/laptop_collag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.kastatic.org/images/store-badges/googl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.kastatic.org/images/lohp/empower_teach... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.kastatic.org/images/lohp/faces_collage... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.kastatic.org/images/lohp/anjali-3.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.kastatic.org/images/lohp/math-unicorn-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
61 images 2.6 MB
0 oversized -0 KB
59 legacy format
9 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

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 (164 KB)
PASS
5 fonts (164 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

164 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 7.6 s LCP 12.3 shttps://cdn.kastatic.org/khanacademy/fonts/d45d409d2fa42169-LatoLatin-Regular.woff2d45d409d2fa42169-LatoLa... https://cdn.kastatic.org/khanacademy/fonts/d45d409d2fa42169-LatoLatin-Regular.woff2 — 43.4 KiB — 4 ms — font-display: swaphttps://cdn.kastatic.org/khanacademy/fonts/1cf13853095a62e2-LatoLatin-Bold.woff21cf13853095a62e2-LatoLa... https://cdn.kastatic.org/khanacademy/fonts/1cf13853095a62e2-LatoLatin-Bold.woff2 — 44.1 KiB — 13 ms — font-display: swaphttps://cdn.kastatic.org/khanacademy/fonts/b430c69579ae2887-SourceSerifPro-Semibold.woff2b430c69579ae2887-Source... https://cdn.kastatic.org/khanacademy/fonts/b430c69579ae2887-SourceSerifPro-Semibold.woff2 — 16.1 KiB — 5 ms — font-display: swaphttps://cdn.kastatic.org/khanacademy/fonts/03ac24f73354c182-SourceSerifPro-Regular.woff203ac24f73354c182-Source... https://cdn.kastatic.org/khanacademy/fonts/03ac24f73354c182-SourceSerifPro-Regular.woff2 — 15.8 KiB — 3 ms — font-display: swaphttps://cdn.kastatic.org/khanacademy/fonts/71fc01820777da89-LatoLatin-Italic.woff271fc01820777da89-LatoLa... https://cdn.kastatic.org/khanacademy/fonts/71fc01820777da89-LatoLatin-Italic.woff2 — 44.6 KiB — 5 ms — font-display: swap
d45d409d2fa42169-LatoLa... woff2 swap
Size 43 KB
Load time 4 ms
Start 413 ms
Risk FOUT — text flashes from fallback to web font
1cf13853095a62e2-LatoLa... woff2 swap
Size 44 KB
Load time 13 ms
Start 680 ms
Risk FOUT — text flashes from fallback to web font
b430c69579ae2887-Source... woff2 swap
Size 16 KB
Load time 5 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
03ac24f73354c182-Source... woff2 swap
Size 16 KB
Load time 3 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
71fc01820777da89-LatoLa... woff2 swap
Size 45 KB
Load time 5 ms
Start 1.1 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)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
—
prefetch
—

1 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
135 requests over 2051ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 7.6 s LCP 12.3 shttps://khanacademy.org// https://khanacademy.org/ — 308 — 248 B — 58 ms — h2https://www.khanacademy.org/www.khanacademy.org/ https://www.khanacademy.org/ — 200 — 65.3 KiB — 275 ms — h2https://cdn.kastatic.org/khanacademy/khanacademy.753cf3d0cb0bd8f2.csscdn.kastatic.org/khanacademy/khanac... https://cdn.kastatic.org/khanacademy/khanacademy.753cf3d0cb0bd8f2.css — 200 — 10.3 KiB — 38 ms — h2https://cdn.kastatic.org/khanacademy/runtime.d2da0f18e591e2c0.jscdn.kastatic.org/khanacademy/runtim... https://cdn.kastatic.org/khanacademy/runtime.d2da0f18e591e2c0.js — 200 — 13.6 KiB — 36 ms — h2https://cdn.kastatic.org/khanacademy/khanacademy.47960f894ea35774.jscdn.kastatic.org/khanacademy/khanac... https://cdn.kastatic.org/khanacademy/khanacademy.47960f894ea35774.js — 200 — 771.2 KiB — 52 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-WSX5PBPwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-WSX5PBP — 200 — 152.6 KiB — 251 ms — h2https://cdn.kastatic.org/khanacademy/fonts/d45d409d2fa42169-LatoLatin-Regular.woff2cdn.kastatic.org/khanacademy/fonts/... https://cdn.kastatic.org/khanacademy/fonts/d45d409d2fa42169-LatoLatin-Regular.woff2 — 200 — 43.4 KiB — 4 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 88 ms — h2https://cdn.kastatic.org/khanacademy/99744.40af4ecde16b5f5e.jscdn.kastatic.org/khanacademy/99744.... https://cdn.kastatic.org/khanacademy/99744.40af4ecde16b5f5e.js — 200 — 1.1 KiB — 2 ms — h2https://cdn.kastatic.org/khanacademy/4521.e823749d0195f971.jscdn.kastatic.org/khanacademy/4521.e... https://cdn.kastatic.org/khanacademy/4521.e823749d0195f971.js — 200 — 2.5 KiB — 8 ms — h2https://cdn.kastatic.org/khanacademy/73950.aabeead257a16f5d.jscdn.kastatic.org/khanacademy/73950.... https://cdn.kastatic.org/khanacademy/73950.aabeead257a16f5d.js — 200 — 5.1 KiB — 8 ms — h2https://cdn.kastatic.org/khanacademy/31195.3b4d841badc817a0.jscdn.kastatic.org/khanacademy/31195.... https://cdn.kastatic.org/khanacademy/31195.3b4d841badc817a0.js — 200 — 1.8 KiB — 8 ms — h2https://cdn.kastatic.org/khanacademy/42157.d185f0a3e4c50a8c.jscdn.kastatic.org/khanacademy/42157.... https://cdn.kastatic.org/khanacademy/42157.d185f0a3e4c50a8c.js — 200 — 17.3 KiB — 27 ms — h2https://cdn.kastatic.org/khanacademy/31495.5bbcddcc1b6c5719.jscdn.kastatic.org/khanacademy/31495.... https://cdn.kastatic.org/khanacademy/31495.5bbcddcc1b6c5719.js — 200 — 3.2 KiB — 13 ms — h2https://cdn.kastatic.org/khanacademy/19070.3f54f41113229743.jscdn.kastatic.org/khanacademy/19070.... https://cdn.kastatic.org/khanacademy/19070.3f54f41113229743.js — 200 — 34.5 KiB — 27 ms — h2https://cdn.kastatic.org/khanacademy/31345.a4d733b0cf527e20.jscdn.kastatic.org/khanacademy/31345.... https://cdn.kastatic.org/khanacademy/31345.a4d733b0cf527e20.js — 200 — 12.4 KiB — 15 ms — h2https://cdn.kastatic.org/khanacademy/51368.fafd57f2e86b4e50.jscdn.kastatic.org/khanacademy/51368.... https://cdn.kastatic.org/khanacademy/51368.fafd57f2e86b4e50.js — 200 — 3.2 KiB — 13 ms — h2https://cdn.kastatic.org/khanacademy/32222.3bbe235c65b96c5d.jscdn.kastatic.org/khanacademy/32222.... https://cdn.kastatic.org/khanacademy/32222.3bbe235c65b96c5d.js — 200 — 1.4 KiB — 15 ms — h2https://cdn.kastatic.org/khanacademy/13065.66f345756c35f432.jscdn.kastatic.org/khanacademy/13065.... https://cdn.kastatic.org/khanacademy/13065.66f345756c35f432.js — 200 — 2.5 KiB — 19 ms — h2https://cdn.kastatic.org/khanacademy/82289.c0a2376c0b473aff.jscdn.kastatic.org/khanacademy/82289.... https://cdn.kastatic.org/khanacademy/82289.c0a2376c0b473aff.js — 200 — 11.7 KiB — 17 ms — h2https://cdn.kastatic.org/khanacademy/54830.1c5b29f2f4cb6519.jscdn.kastatic.org/khanacademy/54830.... https://cdn.kastatic.org/khanacademy/54830.1c5b29f2f4cb6519.js — 200 — 4.3 KiB — 17 ms — h2https://cdn.kastatic.org/khanacademy/73368.323aa82aa4989c9c.jscdn.kastatic.org/khanacademy/73368.... https://cdn.kastatic.org/khanacademy/73368.323aa82aa4989c9c.js — 200 — 2.5 KiB — 19 ms — h2https://cdn.kastatic.org/khanacademy/97099.b7239bed6f5ce444.jscdn.kastatic.org/khanacademy/97099.... https://cdn.kastatic.org/khanacademy/97099.b7239bed6f5ce444.js — 200 — 2.3 KiB — 18 ms — h2https://cdn.kastatic.org/khanacademy/62538.3c089e819b2f9b6e.jscdn.kastatic.org/khanacademy/62538.... https://cdn.kastatic.org/khanacademy/62538.3c089e819b2f9b6e.js — 200 — 35.1 KiB — 25 ms — h2https://cdn.kastatic.org/sounds/khanmigo/audio_samples_v2/error/lmnt:khanmigo-m-1:en.txtcdn.kastatic.org/sounds/khanmigo/au... https://cdn.kastatic.org/sounds/khanmigo/audio_samples_v2/error/lmnt:khanmigo-m-1:en.txt — 200 — 47.6 KiB — 4 ms — h2https://www.khanacademy.org/api/features/sdk-u16yaYPyqdZ0OHuZwww.khanacademy.org/api/features/sd... https://www.khanacademy.org/api/features/sdk-u16yaYPyqdZ0OHuZ — 200 — 53.4 KiB — 35 ms — h2https://tools.applemediaservices.com/api/badges/download-on-the-app-store/black/en-us?releaseDate=1331424000tools.applemediaservices.com/api/ba... https://tools.applemediaservices.com/api/badges/download-on-the-app-store/black/en-us?releaseDate=1331424000 — 301 — 326 B — 362 ms — http/1.1https://cdn.kastatic.org/images/store-badges/google-play/en.pngcdn.kastatic.org/images/store-badge... https://cdn.kastatic.org/images/store-badges/google-play/en.png — 200 — 6.4 KiB — 14 ms — h2https://cdn.kastatic.org/images/country-flag-icons/us-flag.pngcdn.kastatic.org/images/country-fla... https://cdn.kastatic.org/images/country-flag-icons/us-flag.png — 200 — 1.7 KiB — 13 ms — h2https://cdn.kastatic.org/images/country-flag-icons/india-flag.pngcdn.kastatic.org/images/country-fla... https://cdn.kastatic.org/images/country-flag-icons/india-flag.png — 200 — 1.2 KiB — 14 ms — h2
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Per-script blocking time, transfer cost, and cache headers
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Costly
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Unattributable
Other
Costly
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OneTrust
Consent
Essential
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Google Tag Manager
Tag Manager
Optional
Execution 164ms
Transfer 153 KB
Unused 57%
Monthly Cost $2/mo
cdn.kastatic.org
Other
Optional
Execution 160ms
Transfer 35 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • cdn.kastatic.org adds 2148ms and costs ~$29/month
  • www.khanacademy.org adds 762ms and costs ~$10/month
  • Unattributable adds 631ms and costs ~$8/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

cdn.kastatic.org takes 2148ms 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

57% of cdn.kastatic.org'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

www.khanacademy.org takes 762ms 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 631ms 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

52% 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

57% of Google Tag Manager'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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