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.
351 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.37 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
764 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.
757 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
2.17 s
Page Load Progression
FPage Weight BudgetAction3.1 MB transferred, 90 requestsFIX
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
DJS BundlesAction76 scripts, 344 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://luma.com/_next/static/chunks/9b0a8601db1fd226.js | 66 KB | 61 KB (93%) | ✓ | 1st |
| https://luma.com/_next/static/chunks/ea127380585c5092.js | 68 KB | 52 KB (81%) | ✓ | 1st |
| https://luma.com/_next/static/chunks/b3719a52b3a527e2.js | 46 KB | 45 KB (99%) | ✓ | 1st |
| https://luma.com/_next/static/chunks/21ed8889f3e1f0e6.js | 46 KB | 30 KB (66%) | ✓ | 1st |
| https://luma.com/_next/static/chunks/3ec9bad7956d7997.js | 27 KB | 27 KB (99%) | ✓ | 1st |
| https://luma.com/_next/static/chunks/27ee58808e8ddc0c.js | 47 KB | 23 KB (50%) | ✓ | 1st |
| https://luma.com/_next/static/chunks/18e7943844d83a7c.js | 24 KB | 22 KB (92%) | ✓ | 1st |
| https://luma.com/_next/static/chunks/370232465324561a.js | 23 KB | 22 KB (95%) | ✓ | 1st |
| https://luma.com/_next/static/chunks/202a07b052788dd9.js | 57 KB | 21 KB (37%) | ✓ | 1st |
| https://luma.com/_next/static/chunks/3dbead1a4f884a47.js | 23 KB | 20 KB (90%) | ✓ | 1st |
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
DPage Weight InventoryAction90 resources · 3.1 MB · 344 KB savings availableFIX
~343.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 90 resources | 3.1 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
private, no-cache, no-store, max-age=0, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
| no-cache | — | Cache but always revalidate first |
| no-store | — | Never cache this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
BThird-Party Impact57% third-party, 0 ms blockingREVIEW
CJS Execution CostAction1562ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://luma.com/ | 671ms | 2ms | 1ms | 1st |
| https://luma.com/_next/static/chunks/turbopack-cc4bcc45af67f4fc.js | 300ms | 299ms | 0ms | 1st |
| Unattributable | 191ms | 9ms | 0ms | 3rd |
| https://luma.com/_next/static/chunks/370232465324561a.js | 173ms | 171ms | 2ms | 1st |
| https://luma.com/_next/static/chunks/d58f3b7ce4d6c62f.js | 120ms | 8ms | 1ms | 1st |
| https://luma.com/_next/static/chunks/202a07b052788dd9.js | 107ms | 97ms | 5ms | 1st |
A+Text CompressionAll text resources are compressedPASS
A+Image OptimizationNo images on this pagePASS
A+Font Loading1 fonts (71 KB)PASS
Web fonts
1
71 KB total
Render-blocking
0
of 1
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 Waterfall90 requests over 1212msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 191ms | 0 KB | — | €2/mo | Optional |