Skip to content
https://www.bandcamp.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
1
PASS
6
INFO
2

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

Mobile Desktop
64
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.
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.

1.47 s

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

2.44 s

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

337 ms

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

0.070

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

1.94 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.

4.50 s

Page Load Progression

662 ms
1.3 s
2.0 s
2.6 s
3.3 s
4.0 s
4.6 s
5.3 s
Checks
14
6 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
5.3 MB transferred, 210 requests
FIX
5.3 MB transferred, 210 requests
Critical::
Page weighs 9.6 MB (5.3 MB transferred)
Warning::
Images are 3.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.6 MB
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Warning::
210 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.1 g CO2 per page load
5.3 MB / 2.4 MB budget
5.3 MB transferred
210 requests
1.1 g CO2 per page load
Images 3.6 MiB 67%
JavaScript 1.5 MiB 29%
CSS 92.4 KiB 2%
HTML 60.3 KiB 1%
Fonts 33.9 KiB 1%
Other 20.7 KiB 0%
Other 2.6 KiB 0%
Other 216 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 (5.3 MiB of 5.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2258ms total JS execution
FIX
2258ms total JS execution
Warning::
https://s4.bcbits.com/vite/homepage/client/v1/en/e...: 1030ms CPU time
Warning::
Unattributable: 612ms CPU time
Warning::
https://bandcamp.com/: 271ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=GT-WV8...: 114ms CPU time
Info::
https://js.stripe.com/basil/stripe.js: 87ms CPU time
Warning::
Third-party scripts: 2258ms (100% of total)

Main Thread Breakdown

Script Evaluation 64% Other 19% Style & Layout 7% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://s4.bcbits.com/vite/homepage/client/v1/en/entrypoints/HomepageApp.vue_en--Gm-jCgX.js1030ms972ms1ms3rd
Unattributable612ms231ms0ms3rd
https://bandcamp.com/271ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=GT-WV86TPST&cx=c&gtm=4e6460114ms95ms18ms3rd
https://js.stripe.com/basil/stripe.js87ms55ms32ms3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js86ms51ms29ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TKFS52TF59ms47ms12ms3rd
F
JS Bundles
Action
19 scripts, 901 KB unused
FIX
19 scripts, 901 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 162 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 162 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 162 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.stripe.com/basil/stripe.js: 160 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s4.bcbits.com/vite/homepage/client/v1/en/e...: 126 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 901 KB
901 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js0 KB162 KB (45%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB162 KB (45%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB162 KB (45%)✓3rd
https://js.stripe.com/basil/stripe.js220 KB160 KB (73%)✓3rd
https://s4.bcbits.com/vite/homepage/client/v1/en/entrypoints/HomepageApp.vue_en--Gm-jCgX.js297 KB126 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=GT-WV86TPST&cx=c&gtm=4e6460175 KB68 KB (39%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TKFS52TF124 KB62 KB (50%)✓3rd
https://s4.bcbits.com/vite/homepage/client/v1/en/chunks/CookieControl-CQPJrw4t.js1 KB—✓3rd
https://s4.bcbits.com/vite/homepage/client/v1/en/chunks/MenuBar-D8-_GuvZ.js8 KB—✓3rd
https://s4.bcbits.com/vite/homepage/client/v1/en/chunks/CookieControlButton-BG8jnPKH.js1 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
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
167 images, 0 KB saveable
REVIEW
167 images, 0 KB saveable
Info::
All images are well-optimized
167 images 3.6 MB
0 oversized -0 KB
165 legacy format
0 missing dimensions CLS risk
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
1 fonts (34 KB)
PASS
1 fonts (34 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

34 KB total

Render-blocking

0

of 1

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 1.5 s LCP 2.4 shttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 0 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 0 ms
Start 0 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: Axis12 Ltd

Network Waterfall
210 requests over 0ms
INFO

Performance analysis not available for this result.

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 2258ms · 844KB · €25/mo
s4.bcbits.com
Other
Costly
Execution 1030ms
Transfer 297 KB
Unused 43%
Monthly Cost €11/mo
Unattributable
Other
Costly
Execution 612ms
Transfer 0 KB
Monthly Cost €7/mo
bandcamp.com
Other
Costly
Execution 271ms
Transfer 29 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 114ms
Transfer 175 KB
Unused 39%
Monthly Cost €1/mo
Stripe
Payment
Essential
Execution 87ms
Transfer 220 KB
Unused 73%
Monthly Cost €1/mo
www.gstatic.com
Other
Optional
Execution 86ms
Transfer 0 KB
Unused 45%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 59ms
Transfer 124 KB
Unused 50%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • s4.bcbits.com adds 1030ms and costs ~€11/month
  • Unattributable adds 612ms and costs ~€7/month
  • bandcamp.com adds 271ms 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

s4.bcbits.com takes 1030ms 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 612ms 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

bandcamp.com takes 271ms 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

73% of Stripe'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

50% 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.

Send Feedback