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.
1.38 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.61 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
11 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.002
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.41 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.
1.98 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
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, 84 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
BJS Execution Cost658ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 197ms | 65ms | 0ms | 3rd |
| https://asset.zcache.com/bld/z.3/desktop/vendor.fb90f2d169f69f.js | 179ms | 165ms | 0ms | 3rd |
| https://www.zazzle.com/ | 126ms | 4ms | 16ms | 3rd |
| https://www.zazzle.com/cgtw/?id=G-FMN87GXWKG&cx=c>m=4e64h1 | 97ms | 84ms | 10ms | 3rd |
| https://www.zazzle.com/cgtw/?id=GTM-MLV372Q>m_auth=PK96U0sSRa3-sRYTKoYtBQ>m_preview=env-57>m_cookies_win=x | 59ms | 48ms | 10ms | 3rd |
CJS BundlesAction32 scripts, 280 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://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/desktop/purchase.7fb378cc8ee4bf.js | 106 KB | 54 KB (61%) | ✓ | 3rd |
| https://asset.zcache.com/bld/z.3/desktop/vendor.fb90f2d169f69f.js | 114 KB | 35 KB (37%) | ✓ | 3rd |
| https://asset.zcache.com/bld/z.3/desktop/header-Header2021.8e9817f503efde.js | 46 KB | 31 KB (68%) | ✓ | 3rd |
| https://www.zazzle.com/_fs-ch-1T1wmsGaOgGaSxcX/assets/botdefence.js | 205 KB | 25 KB (12%) | ✓ | 3rd |
| https://asset.zcache.com/bld/z.3/desktop/CCAIChat-CcaiHeadlessRootWrapper.15e2f1765e2128.js | 1 KB | — | ✓ | 3rd |
| https://asset.zcache.com/bld/z.3/desktop/3.038daff9864d6b.js | 5 KB | — | ✓ | 3rd |
| https://asset.zcache.com/bld/z.3/desktop/18.d908dd116e660f.js | 5 KB | — | ✓ | 3rd |
| https://asset.zcache.com/bld/z.3/desktop/31.005890d510824d.js | 9 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 InventoryAction84 resources · 1.3 MB · 280 KB savings availableREVIEW
~279.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 84 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
AImage Optimization13 images, 0 KB saveablePASS
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
A+Font Loading6 fonts (123 KB)PASS
Web fonts
6
123 KB total
Render-blocking
0
of 6
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
Network Waterfall84 requests over 2130msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 197ms | 0 KB | — | $1/mo | Optional |
asset.zcache.com asset.zcache.com | Other | 179ms | 114 KB | 37% | $1/mo | Optional |
www.zazzle.com www.zazzle.com | Other | 126ms | 60 KB | — | $1/mo | Optional |
www.zazzle.com www.zazzle.com | Other | 97ms | 182 KB | 39% | $1/mo | Optional |
www.zazzle.com www.zazzle.com | Other | 59ms | 158 KB | 40% | $0/mo | Optional |
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