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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
1
PASS
7
INFO
2

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

Mobile Desktop
91
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
81
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.

674 ms

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

1.42 s

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

112 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.

1.82 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.

3.58 s

Page Load Progression

696 ms
1.4 s
2.1 s
2.8 s
3.5 s
4.2 s
4.9 s
5.6 s
Checks
15
7 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 226 requests
FIX
2.9 MB transferred, 226 requests
Warning::
Page weighs 7.3 MB (2.9 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::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Warning::
226 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.60 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
226 requests
0.60 g CO2 per page load
JavaScript 1.2 MiB 43%
Images 1.1 MiB 38%
Other 180.5 KiB 6%
Other 108.2 KiB 4%
HTML 100.5 KiB 3%
Fonts 84.7 KiB 3%
Other 48.8 KiB 2%
CSS 44.6 KiB 2%
Other 0 B 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

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

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 (2.9 MiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
100 scripts, 462 KB unused
FIX
100 scripts, 462 KB unused
Warning::
https://www.masterclass.com/_next/static/chunks/pa...: 120 KB unused (45%)
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://www.masterclass.com/_next/static/chunks/57...: 39 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 462 KB
462 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.masterclass.com/_next/static/chunks/pages/_app-def298395794f323.js264 KB120 KB (45%)✓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://www.masterclass.com/_next/static/chunks/57808-145f2398a24167dd.js0 KB39 KB (73%)✓3rd
https://www.masterclass.com/_next/static/chunks/57808-145f2398a24167dd.js0 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://www.masterclass.com/_next/static/chunks/84410-0fba64b8af9f512c.js11 KB—✓3rd
https://www.masterclass.com/_next/static/chunks/34663.ffb4047e71bc67c6.js0 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

F
Page Weight Inventory
Action
226 resources · 2.9 MB · 462 KB savings available
FIX
226 resources · 2.9 MB · 462 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~462 KB of savings available
Warning::
225 third-party resources (100% of weight)
Info::
1 resources over 200KB
226 resources · 2.9 MiB · 225 third-party 1.9 MiB over 1MB target
JavaScript 44% · 1.3 MiB
Image 38% · 1.1 MiB
Other 9% · 274.5 KiB
Document 3% · 100.9 KiB
Font 3% · 84.7 KiB
CSS 2% · 56.8 KiB

~461.9 KiB of savings available

Remove unused JavaScript: 461.9 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
JS Execution Cost
Action
1221ms total JS execution
REVIEW
1221ms total JS execution
Warning::
https://www.masterclass.com/: 346ms CPU time
Warning::
Unattributable: 269ms CPU time
Info::
https://www.masterclass.com/_next/static/chunks/51...: 227ms CPU time
Info::
https://www.masterclass.com/_next/static/chunks/fr...: 225ms CPU time
Info::
https://www.masterclass.com/qz6s/: 77ms CPU time
Warning::
Third-party scripts: 1221ms (100% of total)

Main Thread Breakdown

Script Evaluation 48% Other 26% Style & Layout 10% Script Parsing & Compilation 8% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.masterclass.com/346ms6ms1ms3rd
Unattributable269ms40ms0ms3rd
https://www.masterclass.com/_next/static/chunks/51343.fdb6f16b26d0ff53.js227ms190ms1ms3rd
https://www.masterclass.com/_next/static/chunks/framework-399085601056e5e8.js225ms187ms5ms3rd
https://www.masterclass.com/qz6s/77ms65ms12ms3rd
https://www.masterclass.com/_next/static/chunks/pages/_app-def298395794f323.js77ms56ms16ms3rd
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
65 images, 0 KB saveable
PASS
65 images, 0 KB saveable
Warning::
https://www.masterclass.com/course-images/attachme... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
65 images 1.1 MB
0 oversized -0 KB
0 legacy format
1 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

A+
Font Loading
4 fonts (85 KB)
PASS
4 fonts (85 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

85 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 674 ms LCP 1.4 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 — 29 ms — font-display: swaphttps://www.masterclass.com/fonts/sohne-halbfett.woff2sohne-halbfett.woff2 https://www.masterclass.com/fonts/sohne-halbfett.woff2 — 22.0 KiB — 34 ms — font-display: swaphttps://www.masterclass.com/fonts/sohne-buch.woff2sohne-buch.woff2 https://www.masterclass.com/fonts/sohne-buch.woff2 — 21.7 KiB — 37 ms — font-display: swaphttps://www.masterclass.com/fonts/sohne-schmal-dreiviertelfett.woff2sohne-schmal-dreivierte... https://www.masterclass.com/fonts/sohne-schmal-dreiviertelfett.woff2 — 20.5 KiB — 45 ms — font-display: swap
sohne-schmal-dreivierte... woff2 swap
Size 21 KB
Load time 29 ms
Start 439 ms
Risk FOUT — text flashes from fallback to web font
sohne-halbfett.woff2 woff2 swap
Size 22 KB
Load time 34 ms
Start 543 ms
Risk FOUT — text flashes from fallback to web font
sohne-buch.woff2 woff2 swap
Size 22 KB
Load time 37 ms
Start 543 ms
Risk FOUT — text flashes from fallback to web font
sohne-schmal-dreivierte... woff2 swap
Size 20 KB
Load time 45 ms
Start 543 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
226 requests over 3264ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 674 ms LCP 1.4 shttps://masterclass.com// https://masterclass.com/ — 301 — 386 B — 100 ms — h2https://www.masterclass.com/www.masterclass.com/ https://www.masterclass.com/ — 200 — 100.5 KiB — 362 ms — h2https://www.masterclass.com/qz6s/www.masterclass.com/qz6s/ https://www.masterclass.com/qz6s/ — 200 — 154.0 KiB — 95 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 — 29 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 — 37 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 — 35 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 — 33 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 79 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 — datadata: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=256,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=256,quality=75,format=webp/https://static.masterclass.com/Carousel_Kim_Kardashian.jpg — 200 — 4.7 KiB — 42 ms — h2https://www.masterclass.com/cdn-cgi/image/width=256,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=256,quality=75,format=webp/https://static.masterclass.com/Carousel_Jeffrey_Pfeffer_CM_NY.jpg — 200 — 6.9 KiB — 40 ms — h2https://www.masterclass.com/cdn-cgi/image/width=256,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=256,quality=75,format=webp/https://static.masterclass.com/Carousel_Joanna_Gaines_4.jpg — 200 — 11.5 KiB — 42 ms — h2https://www.masterclass.com/cdn-cgi/image/width=256,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=256,quality=75,format=webp/https://static.masterclass.com/Carousel_Ryan_Holiday.jpg — 200 — 9.2 KiB — 46 ms — h2https://www.masterclass.com/cdn-cgi/image/width=256,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=256,quality=75,format=webp/https://static.masterclass.com/Carousel_Instructor_11_BF.jpg — 200 — 7.7 KiB — 43 ms — h2https://www.masterclass.com/cdn-cgi/image/width=256,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=256,quality=75,format=webp/https://static.masterclass.com/Carousel_Ramit_Sethi.jpg — 200 — 7.4 KiB — 46 ms — h2https://www.masterclass.com/cdn-cgi/image/width=256,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=256,quality=75,format=webp/https://static.masterclass.com/Carousel_Rich_Paul_3.jpg — 200 — 11.4 KiB — 44 ms — h2https://www.masterclass.com/cdn-cgi/image/width=256,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=256,quality=75,format=webp/https://static.masterclass.com/Carousel_Mindy_Kaling.jpg — 200 — 7.1 KiB — 49 ms — h2https://www.masterclass.com/cdn-cgi/image/width=256,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=256,quality=75,format=webp/https://static.masterclass.com/Carousel_Mark_Cuban_CM.jpg — 200 — 9.3 KiB — 61 ms — h2https://www.masterclass.com/cdn-cgi/image/width=256,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=256,quality=75,format=webp/https://static.masterclass.com/Hero_Carousel_Kevin_Hart.jpg — 200 — 13.8 KiB — 59 ms — h2https://www.masterclass.com/cdn-cgi/image/width=256,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=256,quality=75,format=webp/https://static.masterclass.com/Carousel_Martha_Stewart_H_NYE.jpg — 200 — 16.8 KiB — 60 ms — h2https://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 — 8.7 KiB — 54 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 — 18.4 KiB — 62 ms — h2https://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 — 14.1 KiB — 59 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 — 67 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 — 63 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 — 38 ms — h2https://www.masterclass.com/fonts/sohne-halbfett.woff2www.masterclass.com/fonts/sohne-hal... https://www.masterclass.com/fonts/sohne-halbfett.woff2 — 200 — 22.0 KiB — 34 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 674 ms LCP 1.4 shttps://masterclass.com// https://masterclass.com/ — 301 — 386 B — 100 ms — h2https://www.masterclass.com/www.masterclass.com/ https://www.masterclass.com/ — 200 — 100.5 KiB — 362 ms — h2https://www.masterclass.com/qz6s/www.masterclass.com/qz6s/ https://www.masterclass.com/qz6s/ — 200 — 154.0 KiB — 95 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 — 29 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 — 37 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 — 35 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 — 33 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 79 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 — datadata: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... 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h2https://prompts.maze.co/api/widgetsprompts.maze.co/api/widgets https://prompts.maze.co/api/widgets — 200 — 156 B — 109 ms — h2https://api.sprig.com/sdk/1/environments/-a7VjAgflTo-/configapi.sprig.com/sdk/1/environments/-a... https://api.sprig.com/sdk/1/environments/-a7VjAgflTo-/config — 200 — 1.0 KiB — 127 ms — http/1.1https://bam-cell.nr-data.net/events/1/c5a76a50d4?a=1809867345&sa=1&v=1.310.1&t=Unnamed%20Transaction&rst=2784&ck=0&s=fa022d51152f64bd&ref=https://www.masterclass.com/&ptid=d15f3f078bd52c30bam-cell.nr-data.net/events/1/c5a76... https://bam-cell.nr-data.net/events/1/c5a76a50d4?a=1809867345&sa=1&v=1.310.1&t=Unnamed%20Transaction&rst=2784&ck=0&s=fa022d51152f64bd&ref=https://www.masterclass.com/&ptid=d15f3f078bd52c30 — 200 — 776 B — 117 ms — http/1.1https://bam-cell.nr-data.net/jserrors/1/c5a76a50d4?a=1809867345&sa=1&v=1.310.1&t=Unnamed%20Transaction&rst=2786&ck=0&s=fa022d51152f64bd&ref=https://www.masterclass.com/&ptid=d15f3f078bd52c30bam-cell.nr-data.net/jserrors/1/c5a... 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http/1.1https://api.sprig.com/sdk/1/visitors/a4964cac-6d3d-4118-ad36-84a43464c11a/eventsapi.sprig.com/sdk/1/visitors/a4964c... https://api.sprig.com/sdk/1/visitors/a4964cac-6d3d-4118-ad36-84a43464c11a/events — 204 — 0 B — 228 ms — http/1.1https://api.sprig.com/sdk/1/environments/-a7VjAgflTo-/visitors/a4964cac-6d3d-4118-ad36-84a43464c11a/attributesapi.sprig.com/sdk/1/environments/-a... https://api.sprig.com/sdk/1/environments/-a7VjAgflTo-/visitors/a4964cac-6d3d-4118-ad36-84a43464c11a/attributes — 204 — 437 B — 285 ms — http/1.1https://api.sprig.com/sdk/1/visitors/a4964cac-6d3d-4118-ad36-84a43464c11a/eventsapi.sprig.com/sdk/1/visitors/a4964c... https://api.sprig.com/sdk/1/visitors/a4964cac-6d3d-4118-ad36-84a43464c11a/events — 200 — 700 B — 201 ms — http/1.1
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 1221ms · 584KB · $16/mo
www.masterclass.com
Other
Costly
Execution 346ms
Transfer 101 KB
Monthly Cost $5/mo
Unattributable
Other
Costly
Execution 269ms
Transfer 0 KB
Monthly Cost $4/mo
www.masterclass.com
Other
Costly
Execution 227ms
Transfer 21 KB
Monthly Cost $3/mo
www.masterclass.com
Other
Costly
Execution 225ms
Transfer 44 KB
Monthly Cost $3/mo
www.masterclass.com
Other
Optional
Execution 77ms
Transfer 154 KB
Unused 42%
Monthly Cost $1/mo
www.masterclass.com
Other
Optional
Execution 77ms
Transfer 264 KB
Unused 45%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.masterclass.com adds 346ms and costs ~$5/month
  • Unattributable adds 269ms and costs ~$4/month
  • www.masterclass.com adds 227ms and costs ~$3/month
  • www.masterclass.com adds 225ms 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.masterclass.com takes 346ms 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 269ms 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 227ms 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 225ms 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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