Performance
· 23 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.
677 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.30 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
12 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.
1.06 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.
2.51 s
Page Load Progression
DPage Weight BudgetAction2.5 MB transferred, 304 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
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
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BJS Execution Cost900ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 361ms | 50ms | 0ms | 1st |
| https://ateliervalere.myshopify.com/ | 273ms | 41ms | 6ms | 1st |
| https://ateliervalere.myshopify.com/cdn/wpm/bc8540278we853e1abpb62b2c4amde256306m.js | 84ms | 66ms | 6ms | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-6KDE90CKZE | 69ms | 58ms | 11ms | 3rd |
| https://cdn.shopify.com/storefront/web-components/account.js | 63ms | 9ms | 0ms | 3rd |
| https://ateliervalere.myshopify.com/cdn/s/trekkie.storefront.f1ba865b3fecd812ad617f74ac079261075e9edb.min.js | 50ms | 45ms | 2ms | 1st |
BJS Bundles228 scripts, 104 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-6KDE90CKZE | 173 KB | 70 KB (40%) | ✓ | 3rd |
| https://ateliervalere.myshopify.com/cdn/wpm/bc8540278we853e1abpb62b2c4amde256306m.js | 80 KB | 34 KB (43%) | ✓ | 1st |
| https://ateliervalere.myshopify.com/cdn/shop/t/3/assets/standard-actions-override.js?v=171683365447094389611790273641 | 1 KB | — | ✓ | 1st |
| https://ateliervalere.myshopify.com/cdn/shop/t/3/assets/page-view-event.js?v=12823247316348680231790273641 | 1 KB | — | ✓ | 1st |
| https://cdn.shopify.com/storefront/standard-events.js | 4 KB | — | ✓ | 3rd |
| https://ateliervalere.myshopify.com/cdn/shop/t/3/assets/utilities.js?v=51671090137987445501790273641 | 5 KB | — | ✓ | 1st |
| https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/loader.init-shop-cart-sync.fr.esm.js | 1 KB | — | ✓ | 3rd |
| https://ateliervalere.myshopify.com/cdn/shop/t/3/assets/header.js?v=183210491532312943441790273641 | 2 KB | — | ✓ | 1st |
| https://ateliervalere.myshopify.com/cdn/shop/t/3/assets/dialog.js?v=144816527575655702281790273641 | 2 KB | — | ✓ | 1st |
| https://cdn.shopify.com/storefront/standard-actions.js | 5 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
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
CPage Weight InventoryAction304 resources · 2.5 MB · 104 KB savings availableREVIEW
~103.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 304 resources | 2.5 MiB | ||||||
AThird-Party Impact38% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization11 images, 0 KB saveablePASS
A+Font Loading4 fonts (126 KB)PASS
Web fonts
4
126 KB total
Render-blocking
0
of 4
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+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
A+Document CompressionDocument response uses brotliPASS
A+Asset CompressionAll 1 asset host use brotliPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server-Timing Observability17 Server-Timing entries advertisedPASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall304 requests over 5232msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 69ms | 173 KB | 40% | €0/mo | Optional |
cdn.shopify.com cdn.shopify.com | Other | 63ms | 10 KB | — | €0/mo | Optional |
Image Optimization18 images, 458 KB total, 137 KB wastedINFO
Image Optimization Audit
Total Images
18
Total Size
458 KB
Oversized
2
Wasted
137 KB