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https://masterclass.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
6
REVIEW
0
PASS
9
INFO
2

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

Mobile Desktop
68
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
76
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.
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.

2.39 s

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

2.62 s

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

909 ms

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

0.000

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

5.79 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.

17.09 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
9 PASS 6 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 198 requests
FIX
3.0 MB transferred, 198 requests
Warning::
Page weighs 7.1 MB (3.0 MB transferred)
Warning::
Images are 1.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.3 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::
198 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.64 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
198 requests
0.64 g CO2 per page load
Images 1.3 MiB 42%
JavaScript 1.2 MiB 41%
Other 167.9 KiB 5%
Fonts 120.1 KiB 4%
Other 107.2 KiB 3%
HTML 99.3 KiB 3%
CSS 44.5 KiB 1%
Other 2.9 KiB 0%
Other 0 B 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 (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
5286ms total JS execution
FIX
5286ms total JS execution
Warning::
https://www.masterclass.com/: 1252ms CPU time
Warning::
Unattributable: 920ms CPU time
Warning::
https://www.masterclass.com/_next/static/chunks/51...: 816ms CPU time
Warning::
https://www.masterclass.com/_next/static/chunks/fr...: 803ms CPU time
Warning::
https://www.masterclass.com/_next/static/chunks/pa...: 359ms CPU time
Warning::
Third-party scripts: 5286ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 24% Style & Layout 10% Script Parsing & Compilation 7% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.masterclass.com/1252ms28ms4ms3rd
Unattributable920ms151ms0ms3rd
https://www.masterclass.com/_next/static/chunks/51343.fdb6f16b26d0ff53.js816ms682ms8ms3rd
https://www.masterclass.com/_next/static/chunks/framework-399085601056e5e8.js803ms678ms15ms3rd
https://www.masterclass.com/_next/static/chunks/pages/_app-def298395794f323.js359ms287ms71ms3rd
https://www.masterclass.com/qz6s/299ms260ms38ms3rd
https://cdn.cookielaw.org/scripttemplates/6.8.0/otBannerSdk.js254ms157ms50ms3rd
https://www.masterclass.com/_next/static/chunks/pages/index-eac20d35c47e8f82.js186ms182ms3ms3rd
https://www.masterclass.com/_next/static/chunks/83936.cf2d392c07d59b86.js102ms96ms1ms3rd
https://www.masterclass.com/_next/static/chunks/main-d018a17d7f77d17e.js94ms72ms21ms3rd

Showing top 10 of 13 scripts

D
JS Bundles
Action
80 scripts, 386 KB unused
FIX
80 scripts, 386 KB unused
Warning::
https://www.masterclass.com/_next/static/chunks/pa...: 121 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.masterclass.com/_next/static/chunks/ae...: 111 KB unused (95%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.masterclass.com/qz6s/: 64 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.masterclass.com/_next/static/chunks/57...: 39 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/6.8.0/ot...: 29 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 386 KB
386 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.masterclass.com/_next/static/chunks/pages/_app-def298395794f323.js265 KB121 KB (46%)✓3rd
https://www.masterclass.com/_next/static/chunks/ae9cca2d-0c7880e166e75652.js116 KB111 KB (95%)✓3rd
https://www.masterclass.com/qz6s/154 KB64 KB (42%)✓3rd
https://www.masterclass.com/_next/static/chunks/57808-145f2398a24167dd.js53 KB39 KB (73%)✓3rd
https://cdn.cookielaw.org/scripttemplates/6.8.0/otBannerSdk.js72 KB29 KB (41%)✓3rd
https://www.masterclass.com/_next/static/chunks/94050-bd22d797a1740d71.js38 KB22 KB (59%)✓3rd
https://public.profitwell.com/js/profitwell.js?auth=e9555f81918513bfffeaa3cdd3990fd110 KB—✓3rd
https://www.masterclass.com/_next/static/chunks/26751-82e2c4532668b8eb.js3 KB—✓3rd
https://www.masterclass.com/_next/static/chunks/82203-6c7133bed77efab0.js2 KB—✓3rd
https://www.masterclass.com/_next/static/chunks/3215-bef04d883a50e76f.js4 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

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
198 resources · 3.0 MB · 386 KB savings available
FIX
198 resources · 3.0 MB · 386 KB savings available
Warning::
Page weight 2.0 MB over 1MB target
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~386 KB of savings available
Warning::
197 third-party resources (100% of weight)
Info::
1 resources over 200KB
198 resources · 3.0 MiB · 197 third-party 2.0 MiB over 1MB target
Image 42% · 1.3 MiB
JavaScript 41% · 1.2 MiB
Other 9% · 273.7 KiB
Font 4% · 120.1 KiB
Document 3% · 99.7 KiB
CSS 1% · 44.5 KiB

~385.8 KiB of savings available

Remove unused JavaScript: 385.8 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.

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
60 images, 0 KB saveable
PASS
60 images, 0 KB saveable
Info::
All images are well-optimized
60 images 1.3 MB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
5 fonts (120 KB)
PASS
5 fonts (120 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

120 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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 2.4 s LCP 2.6 shttps://www.masterclass.com/_next-public/fonts/sohne-schmal-dreiviertelfett.woff2sohne-schmal-dreivierte... https://www.masterclass.com/_next-public/fonts/sohne-schmal-dreiviertelfett.woff2 — 20.5 KiB — 31 ms — font-display: swaphttps://www.masterclass.com/fonts/sohne-buch.woff2sohne-buch.woff2 https://www.masterclass.com/fonts/sohne-buch.woff2 — 22.0 KiB — 31 ms — font-display: swaphttps://www.masterclass.com/fonts/sohne-halbfett.woff2sohne-halbfett.woff2 https://www.masterclass.com/fonts/sohne-halbfett.woff2 — 21.7 KiB — 43 ms — font-display: swaphttps://www.masterclass.com/fonts/sohne-schmal-dreiviertelfett.woff2sohne-schmal-dreivierte... https://www.masterclass.com/fonts/sohne-schmal-dreiviertelfett.woff2 — 20.4 KiB — 39 ms — font-display: swaphttps://www.masterclass.com/_next/static/media/IvarDisplayCondensed-Regular.073aa74a.otfIvarDisplayCondensed-Re... https://www.masterclass.com/_next/static/media/IvarDisplayCondensed-Regular.073aa74a.otf — 35.4 KiB — 31 ms — font-display: swap
sohne-schmal-dreivierte... woff2 swap
Size 21 KB
Load time 31 ms
Start 337 ms
Risk FOUT — text flashes from fallback to web font
sohne-buch.woff2 woff2 swap
Size 22 KB
Load time 31 ms
Start 437 ms
Risk FOUT — text flashes from fallback to web font
sohne-halbfett.woff2 woff2 swap
Size 22 KB
Load time 43 ms
Start 438 ms
Risk FOUT — text flashes from fallback to web font
sohne-schmal-dreivierte... woff2 swap
Size 20 KB
Load time 39 ms
Start 438 ms
Risk FOUT — text flashes from fallback to web font
IvarDisplayCondensed-Re... otf swap
Size 35 KB
Load time 31 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~11 KB and ~22 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
198 requests over 3054ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.4 s LCP 2.6 shttps://masterclass.com// https://masterclass.com/ — 301 — 388 B — 89 ms — h2https://www.masterclass.com/www.masterclass.com/ https://www.masterclass.com/ — 200 — 99.3 KiB — 321 ms — h2https://www.masterclass.com/qz6s/www.masterclass.com/qz6s/ https://www.masterclass.com/qz6s/ — 200 — 154.0 KiB — 115 ms — h2https://www.masterclass.com/_next-public/fonts/sohne-schmal-dreiviertelfett.woff2www.masterclass.com/_next-public/fo... https://www.masterclass.com/_next-public/fonts/sohne-schmal-dreiviertelfett.woff2 — 200 — 20.5 KiB — 31 ms — h2https://www.masterclass.com/_next/static/css/984eccb414f1eeac.csswww.masterclass.com/_next/static/cs... https://www.masterclass.com/_next/static/css/984eccb414f1eeac.css — 200 — 33.0 KiB — 36 ms — h2https://www.masterclass.com/_next/static/css/bcd4e92f2e90c693.csswww.masterclass.com/_next/static/cs... https://www.masterclass.com/_next/static/css/bcd4e92f2e90c693.css — 200 — 771 B — 32 ms — h2https://www.masterclass.com/_next/static/css/77c4fcee11a8cd53.csswww.masterclass.com/_next/static/cs... https://www.masterclass.com/_next/static/css/77c4fcee11a8cd53.css — 200 — 1.7 KiB — 33 ms — h2https://www.masterclass.com/_next/static/css/6e6fc1ec04eb4a91.csswww.masterclass.com/_next/static/cs... https://www.masterclass.com/_next/static/css/6e6fc1ec04eb4a91.css — 200 — 538 B — 34 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 104 ms — h2data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%271…www.w3.org/2000/svg%27%20version=%2... data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%271… — 200 — 0 B — 0 ms — datahttps://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Kim_Kardashian.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Kim_Kardashian.jpg — 200 — 8.6 KiB — 53 ms — h2data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%274…www.w3.org/2000/svg%27%20version=%2... data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%274… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%272…www.w3.org/2000/svg%27%20version=%2... data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%272… — 200 — 0 B — 0 ms — datahttps://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Jeffrey_Pfeffer_CM_NY.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Jeffrey_Pfeffer_CM_NY.jpg — 200 — 14.2 KiB — 45 ms — h2https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Joanna_Gaines_4.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Joanna_Gaines_4.jpg — 200 — 21.7 KiB — 53 ms — h2https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Ryan_Holiday.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Ryan_Holiday.jpg — 200 — 18.5 KiB — 53 ms — h2https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Instructor_11_BF.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Instructor_11_BF.jpg — 200 — 14.6 KiB — 45 ms — h2https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Ramit_Sethi.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Ramit_Sethi.jpg — 200 — 14.8 KiB — 40 ms — h2https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Rich_Paul_3.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Rich_Paul_3.jpg — 200 — 22.7 KiB — 141 ms — h2https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Mindy_Kaling.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Mindy_Kaling.jpg — 200 — 14.1 KiB — 40 ms — h2https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Mark_Cuban_CM.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Mark_Cuban_CM.jpg — 200 — 18.5 KiB — 46 ms — h2https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Hero_Carousel_Kevin_Hart.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Hero_Carousel_Kevin_Hart.jpg — 200 — 27.2 KiB — 51 ms — h2https://www.masterclass.com/fonts/sohne-buch.woff2www.masterclass.com/fonts/sohne-buc... https://www.masterclass.com/fonts/sohne-buch.woff2 — 200 — 22.0 KiB — 31 ms — h2https://www.masterclass.com/fonts/sohne-halbfett.woff2www.masterclass.com/fonts/sohne-hal... https://www.masterclass.com/fonts/sohne-halbfett.woff2 — 200 — 21.7 KiB — 43 ms — h2https://www.masterclass.com/fonts/sohne-schmal-dreiviertelfett.woff2www.masterclass.com/fonts/sohne-sch... https://www.masterclass.com/fonts/sohne-schmal-dreiviertelfett.woff2 — 200 — 20.4 KiB — 39 ms — h2https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Martha_Stewart_H_NYE.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Martha_Stewart_H_NYE.jpg — 200 — 34.3 KiB — 59 ms — h2https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Gordon_Ramsay.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=384,quality=75,format=webp/https://static.masterclass.com/Carousel_Gordon_Ramsay.jpg — 200 — 15.7 KiB — 45 ms — h2https://www.masterclass.com/cdn-cgi/image/width=1080,quality=75,format=webp/https://static.masterclass.com/Carousel_Kim_Kardashian.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=1080,quality=75,format=webp/https://static.masterclass.com/Carousel_Kim_Kardashian.jpg — 200 — 18.2 KiB — 51 ms — h2https://www.masterclass.com/cdn-cgi/image/width=1080,quality=75,format=webp/https://static.masterclass.com/Carousel_Jeffrey_Pfeffer_CM_NY.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=1080,quality=75,format=webp/https://static.masterclass.com/Carousel_Jeffrey_Pfeffer_CM_NY.jpg — 200 — 32.7 KiB — 47 ms — h2https://www.masterclass.com/cdn-cgi/image/width=1080,quality=75,format=webp/https://static.masterclass.com/Carousel_Joanna_Gaines_4.jpgwww.masterclass.com/cdn-cgi/image/w... https://www.masterclass.com/cdn-cgi/image/width=1080,quality=75,format=webp/https://static.masterclass.com/Carousel_Joanna_Gaines_4.jpg — 200 — 38.2 KiB — 44 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 5286ms · 795KB · $70/mo
www.masterclass.com
Other
Costly
Execution 1252ms
Transfer 99 KB
Monthly Cost $17/mo
Unattributable
Other
Costly
Execution 920ms
Transfer 0 KB
Monthly Cost $12/mo
www.masterclass.com
Other
Costly
Execution 816ms
Transfer 21 KB
Monthly Cost $11/mo
www.masterclass.com
Other
Costly
Execution 803ms
Transfer 44 KB
Monthly Cost $11/mo
www.masterclass.com
Other
Costly
Execution 359ms
Transfer 265 KB
Unused 46%
Monthly Cost $5/mo
www.masterclass.com
Other
Costly
Execution 299ms
Transfer 154 KB
Unused 42%
Monthly Cost $4/mo
OneTrust
Consent
Essential
Execution 254ms
Transfer 72 KB
Unused 41%
Monthly Cost $3/mo
www.masterclass.com
Other
Optional
Execution 186ms
Transfer 11 KB
Monthly Cost $2/mo
www.masterclass.com
Other
Optional
Execution 102ms
Transfer 5 KB
Monthly Cost $1/mo
www.masterclass.com
Other
Optional
Execution 94ms
Transfer 36 KB
Monthly Cost $1/mo
www.masterclass.com
Other
Optional
Execution 82ms
Transfer 21 KB
Monthly Cost $1/mo
www.masterclass.com
Other
Optional
Execution 61ms
Transfer 38 KB
Unused 59%
Monthly Cost $1/mo
www.masterclass.com
Other
Optional
Execution 57ms
Transfer 29 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.masterclass.com adds 1252ms and costs ~$17/month
  • Unattributable adds 920ms and costs ~$12/month
  • www.masterclass.com adds 816ms and costs ~$11/month
  • www.masterclass.com adds 803ms and costs ~$11/month
  • www.masterclass.com adds 359ms and costs ~$5/month
  • www.masterclass.com adds 299ms and costs ~$4/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.

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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.masterclass.com takes 1252ms 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 920ms 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.masterclass.com takes 816ms 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.masterclass.com takes 803ms 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.masterclass.com takes 359ms 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.masterclass.com takes 299ms 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

59% of www.masterclass.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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