Performance
· 24 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.
694 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.36 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.32 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.
2.03 s
Page Load Progression
FPage Weight BudgetAction9.4 MB transferred, 539 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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
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 ImpactAction79% third-party, 0 ms blockingFIX
FJS Execution CostAction12107ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://castleware.com/ | 10091ms | 40ms | 8ms | 1st |
| https://cdn.shopify.com/extensions/01a14cf5-286f-736e-b44b-0d71e2ffbe5e/variant-image-swatch-280/assets/variant-swatch-king-11-55.min.js | 785ms | 371ms | 5ms | 3rd |
| Unattributable | 645ms | 30ms | 0ms | 1st |
| https://cdn.withgifted.com/gftd-script.js?shop=castleware-baby.myshopify.com | 184ms | 101ms | 7ms | 3rd |
| https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js | 100ms | 47ms | 3ms | 3rd |
| https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.register_cLcgCW8c.esm.js | 90ms | 53ms | 0ms | 3rd |
| https://castleware.com/cdn/wpm/b9f5e2762wb720532ap19708c42m93b2bec3m.js | 89ms | 61ms | 6ms | 1st |
| https://castleware.com/cdn/shopifycloud/storefront/assets/storefront/load_feature-1bd60354.js | 62ms | 61ms | 0ms | 1st |
| https://cdn.shopify.com/storefront/web-components/account.js | 62ms | 13ms | 0ms | 3rd |
FJS BundlesAction298 scripts, 545 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://castlewarebaby.marsello.app/assets/index-BcSOM-Sp.js | 235 KB | 171 KB (73%) | ✓ | 3rd |
| https://castlewarebaby.marsello.app/assets/index-BcSOM-Sp.js | 235 KB | 171 KB (73%) | ✓ | 3rd |
| https://castleware.com/cdn/wpm/b9f5e2762wb720532ap19708c42m93b2bec3m.js | 83 KB | 44 KB (53%) | ✓ | 1st |
| https://cdn.withgifted.com/gftd-script.js?shop=castleware-baby.myshopify.com | 89 KB | 40 KB (45%) | ✓ | 3rd |
| https://cdn1.stamped.io/files/widget.min.js?shop=castleware-baby.myshopify.com | 33 KB | 27 KB (81%) | ✓ | 3rd |
| https://cdn.nfcube.com/instafeed-70855350e3c9ab6bf03a4107da823806.js?shop=castleware-baby.myshopify.com | 27 KB | 25 KB (94%) | ✓ | 3rd |
| https://castleware.com/cdn/shop/t/19/assets/theme.js?v=13968561988284492361783628779 | 38 KB | 23 KB (62%) | ✓ | 1st |
| https://cdn.shopify.com/extensions/01a14cf5-286f-736e-b44b-0d71e2ffbe5e/variant-image-swatch-280/assets/variant-swatch-king-11-55.min.js | 42 KB | 23 KB (55%) | ✓ | 3rd |
| https://cdn.shopify.com/storefront/web-components/chat/agent-runtime-Vej3u4rx.js | 42 KB | 22 KB (53%) | ✓ | 3rd |
| https://cdn.shopify.com/shopifycloud/arrive-server/pay/vite-pay/assets/checkout-DTJs6qRt.js | 0 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
FPage Weight InventoryAction539 resources · 9.4 MB · 545 KB savings availableFIX
~544.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 539 resources | 9.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction67 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Performance issues directly impact user engagement and conversion rates.
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
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
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading10 fonts (237 KB)PASS
Web fonts
10
237 KB total
Render-blocking
0
of 10
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
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)
Fixing the unchecked items could save ~4 KB and ~8 ms
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
AAsset Compression1 of 3 asset hosts still on gzipPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server-Timing Observability18 Server-Timing entries advertisedPASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
Network Waterfall539 requests over 36103msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
cdn.shopify.com cdn.shopify.com | Other | 785ms | 42 KB | 55% | €4/mo | Costly |
cdn.withgifted.com cdn.withgifted.com | Other | 184ms | 89 KB | 45% | €1/mo | Optional |
ajax.googleapis.com ajax.googleapis.com | Other | 100ms | 33 KB | — | €1/mo | Optional |
cdn.shopify.com cdn.shopify.com | Other | 90ms | 14 KB | — | €0/mo | Optional |
cdn.shopify.com cdn.shopify.com | Other | 62ms | 10 KB | — | €0/mo | Optional |
These scripts may cost more than they're worth
- cdn.shopify.com adds 785ms and costs ~€4/month
cdn.shopify.com takes 785ms 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
55% of cdn.shopify.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
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-09-19 — 2026-10-16)
LCP (p75)
0 ms
0% good
INP (p75)
0 ms
0% good
CLS (p75)
0.000
94% good
FCP (p75)
606 ms
TTFB (p75)
0 ms
Image Optimization83 images, 2291 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
83
Total Size
2291 KB
Oversized
2