Performance
· 17 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.
5.28 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
7.01 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
504 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.003
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.28 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.
9.25 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2517ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 757ms | 218ms | 0ms | 3rd |
| https://asset.zcache.com/bld/z.3/mobile/vendor.f24d71033fb42e.js | 509ms | 475ms | 2ms | 3rd |
| https://www.zazzle.com/ | 463ms | 18ms | 32ms | 3rd |
| https://www.zazzle.com/cgtw/?id=G-FMN87GXWKG&cx=c>m=4e64h1 | 342ms | 294ms | 43ms | 3rd |
| https://www.zazzle.com/cgtw/?id=GTM-MLV372Q>m_auth=PK96U0sSRa3-sRYTKoYtBQ>m_preview=env-57>m_cookies_win=x | 225ms | 177ms | 45ms | 3rd |
| https://www.zazzle.com/_fs-ch-1T1wmsGaOgGaSxcX/assets/botdefence.js | 221ms | 186ms | 13ms | 3rd |
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BPage Weight Budget1.3 MB transferred, 79 requestsREVIEW
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
CJS BundlesAction30 scripts, 284 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.zazzle.com/cgtw/?id=G-FMN87GXWKG&cx=c>m=4e64h1 | 182 KB | 71 KB (39%) | ✓ | 3rd |
| https://asset.zcache.com/bld/z.3/mobile/purchase.600311f3e7b909.js | 105 KB | 65 KB (62%) | ✓ | 3rd |
| https://www.zazzle.com/cgtw/?id=GTM-MLV372Q>m_auth=PK96U0sSRa3-sRYTKoYtBQ>m_preview=env-57>m_cookies_win=x | 158 KB | 63 KB (40%) | ✓ | 3rd |
| https://asset.zcache.com/bld/z.3/mobile/vendor.f24d71033fb42e.js | 114 KB | 38 KB (39%) | ✓ | 3rd |
| https://www.zazzle.com/_fs-ch-1T1wmsGaOgGaSxcX/assets/botdefence.js | 205 KB | 25 KB (12%) | ✓ | 3rd |
| https://asset.zcache.com/bld/z.3/mobile/header-Header2021.ad19af62e1c608.js | 30 KB | 22 KB (72%) | ✓ | 3rd |
| https://asset.zcache.com/bld/z.3/mobile/CCAIChat-CcaiHeadlessRootWrapper.04a2cf153f9c7a.js | 1 KB | — | ✓ | 3rd |
| https://asset.zcache.com/bld/z.3/mobile/15.aa293ba14731a7.js | 5 KB | — | ✓ | 3rd |
| https://asset.zcache.com/bld/z.3/mobile/56.b5095d533a7821.js | 3 KB | — | ✓ | 3rd |
| https://asset.zcache.com/bld/z.3/mobile/18.d14cd0fd9f9d5e.js | 3 KB | — | ✓ | 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
CPage Weight InventoryAction79 resources · 1.3 MB · 284 KB savings availableREVIEW
~283.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 79 resources | 1.3 MiB | ||||||
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization13 images, 0 KB saveablePASS
A+Font Loading5 fonts (111 KB)PASS
Web fonts
5
111 KB total
Render-blocking
0
of 5
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 Hints3 hints, 0 missing preconnectsPASS
Current Resource Hints
3 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall79 requests over 2087msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 757ms | 0 KB | — | $4/mo | Costly |
asset.zcache.com asset.zcache.com | Other | 509ms | 114 KB | 39% | $3/mo | Costly |
www.zazzle.com www.zazzle.com | Other | 463ms | 54 KB | — | $3/mo | Costly |
www.zazzle.com www.zazzle.com | Other | 342ms | 182 KB | 39% | $2/mo | Costly |
www.zazzle.com www.zazzle.com | Other | 225ms | 158 KB | 40% | $1/mo | Costly |
www.zazzle.com www.zazzle.com | Other | 221ms | 205 KB | 12% | $1/mo | Costly |
These scripts may cost more than they're worth
- Unattributable adds 757ms and costs ~$4/month
- asset.zcache.com adds 509ms and costs ~$3/month
- www.zazzle.com adds 463ms and costs ~$3/month
- www.zazzle.com adds 342ms and costs ~$2/month
- www.zazzle.com adds 225ms and costs ~$1/month
- www.zazzle.com adds 221ms and costs ~$1/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
Unattributable takes 757ms 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
asset.zcache.com takes 509ms 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.zazzle.com takes 463ms 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.zazzle.com takes 342ms 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.zazzle.com takes 225ms 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.zazzle.com takes 221ms 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