Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
561 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.24 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
68 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.029
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.46 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.
3.21 s
Page Load Progression
FPage Weight BudgetAction3.7 MB transferred, 102 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
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.
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.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction33 scripts, 514 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.js | 128 KB | 72 KB (56%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TWLZG64 | 167 KB | 60 KB (36%) | ✓ | 3rd |
| https://www.bigcartel.com/_next/static/chunks/902-4369fd968ddd8e44.js | 71 KB | 57 KB (82%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-QZ4HDFTSEZ&cx=c>m=4e64h1 | 176 KB | 54 KB (31%) | ✓ | 3rd |
| https://www.bigcartel.com/_next/static/chunks/772-dfe02da074767397.js | 44 KB | 43 KB (100%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 34 KB (35%) | ✓ | 3rd |
| https://www.bigcartel.com/_next/static/chunks/563-4ea1942182c5ef9c.js | 47 KB | 34 KB (74%) | ✓ | 3rd |
| https://www.bigcartel.com/_next/static/chunks/750-145ca771109932a1.js | 55 KB | 33 KB (60%) | ✓ | 3rd |
| https://t.bigcartel.com/static/array.js | 61 KB | 32 KB (53%) | ✓ | 3rd |
| https://www.bigcartel.com/_next/static/chunks/221-941900672da61725.js | 53 KB | 26 KB (49%) | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction102 resources · 3.7 MB · 514 KB savings availableFIX
~514.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 102 resources | 3.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization31 images, 0 KB saveableREVIEW
CJS Execution CostAction1492ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.bigcartel.com/ | 371ms | 18ms | 8ms | 3rd |
| Unattributable | 260ms | 49ms | 0ms | 3rd |
| https://www.bigcartel.com/_next/static/chunks/517-5f69a06d472fe7ea.js | 247ms | 212ms | 10ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-QZ4HDFTSEZ&cx=c>m=4e64h1 | 150ms | 129ms | 17ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TWLZG64 | 136ms | 104ms | 17ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 103ms | 93ms | 2ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.js | 92ms | 70ms | 15ms | 3rd |
| https://www.bigcartel.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 76ms | 73ms | 1ms | 3rd |
| https://t.bigcartel.com/static/array.js | 56ms | 48ms | 6ms | 3rd |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (166 KB)PASS
Web fonts
3
166 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall102 requests over 3014msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.bigcartel.com www.bigcartel.com | Other | 371ms | 64 KB | — | €4/mo | Costly |
Unattributable Unattributable | Other | 260ms | 0 KB | — | €3/mo | Costly |
www.bigcartel.com www.bigcartel.com | Other | 247ms | 50 KB | 47% | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 150ms | 176 KB | 31% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 136ms | 167 KB | 36% | €1/mo | Optional |
Microsoft Clarity scripts.clarity.ms | Session Replay | 103ms | 26 KB | — | €1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 92ms | 128 KB | 56% | €1/mo | Essential |
www.bigcartel.com www.bigcartel.com | Other | 76ms | 0 KB | — | €1/mo | Optional |
t.bigcartel.com t.bigcartel.com | Other | 56ms | 61 KB | 53% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.bigcartel.com adds 371ms and costs ~€4/month
- Unattributable adds 260ms and costs ~€3/month
- www.bigcartel.com adds 247ms and costs ~€3/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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.bigcartel.com takes 371ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 260ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.bigcartel.com takes 247ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
56% of OneTrust's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
53% of t.bigcartel.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev