https://www.crystillery.com
Performance
· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
88
GRADE
B
FIX
3
REVIEW
5
PASS
16
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
59
93
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
3.51 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.60 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
246 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.05 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.
8.87 s
Page Load Progression
496 ms 993 ms 1.5 s 2.0 s
2.5 s
3.0 s 3.5 s
4.0 sChecks
2716 PASS 5 REVIEW 3 FIX
DPage Weight BudgetAction2.5 MB transferred, 225 requestsFIX
Page Weight Budget
Action2.5 MB transferred, 225 requests
2.5 MB transferred, 225 requests
Warning::
Page weighs 2.6 MB (2.5 MB transferred)
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Warning::
225 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.52 g CO2 per page load
2.5 MB transferred
225 requests
0.52 g CO2 per page load
Images 1.1 MiB 43%
Other 860.3 KiB 34%
JavaScript 304.1 KiB 12%
Fonts 143.3 KiB 6%
HTML 68.5 KiB 3%
CSS 44.0 KiB 2%
Other 11.2 KiB 0%
Other 6.8 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Why this matters
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Why this matters
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DJS Execution CostAction2297ms total JS executionFIX
JS Execution Cost
Action2297ms total JS execution
2297ms total JS execution
Warning::
Unattributable: 711ms CPU time
Warning::
https://www.crystillery.com/cdn/wpm/b5982071ew7ea4...: 435ms CPU time
Warning::
https://www.crystillery.com/: 416ms CPU time
Info::
https://www.crystillery.com/cdn/s/trekkie.storefro...: 196ms CPU time
Info::
https://www.crystillery.com/cdn/shop/t/2/assets/gl...: 185ms CPU time
Info::
Third-party scripts: 138ms (6% of total)
Main Thread Breakdown
Script Evaluation 45% Other 35% Style & Layout 11% Script Parsing & Compilation 5% Parse HTML & CSS 3%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 711ms | 47ms | 0ms | 1st |
| https://www.crystillery.com/cdn/wpm/b5982071ew7ea472e3p69b68784m2150dfeam.js | 435ms | 306ms | 32ms | 1st |
| https://www.crystillery.com/ | 416ms | 96ms | 20ms | 1st |
| https://www.crystillery.com/cdn/s/trekkie.storefront.8fbb7598bfc52f7298fce09b15942db7f0f927c3.min.js | 196ms | 183ms | 11ms | 1st |
| https://www.crystillery.com/cdn/shop/t/2/assets/global.js?v=127210358271191040921685405334 | 185ms | 39ms | 4ms | 1st |
| https://www.crystillery.com/cdn/shopifycloud/perf-kit/shopify-perf-kit-3.9.4.min.js | 163ms | 113ms | 7ms | 1st |
| https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.register_CkC56SUN.esm.js | 138ms | 133ms | 0ms | 3rd |
| https://www.crystillery.com/cdn/shopifycloud/storefront/assets/shopify_pay/storefront-616277c7.js?v=20250812 | 53ms | 37ms | 15ms | 1st |
FHTTP CachingActionNo cache headersFIX
HTTP Caching
ActionNo cache headers
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CDocument CompressionActionDocument response served uncompressedREVIEW
Document Compression
ActionDocument response served uncompressed
Document response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
Main HTML Cache-Control
No Cache-Control header on main HTML response
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
CPage Weight InventoryAction225 resources · 2.5 MB · 36 KB savings availableREVIEW
Page Weight Inventory
Action225 resources · 2.5 MB · 36 KB savings available
225 resources · 2.5 MB · 36 KB savings available
Warning::
Page weight 2.5 MB exceeds 1 MB target by 1.5 MB
Got: 2.5 MB Expected: ≤ 1 MB
Info::
60 third-party resources (8% of weight)
Info::
2 resources over 200KB
225 resources · 2.5 MiB · 60 third-party 1.5 MiB over 1MB target
JavaScript 46% · 1.1 MiB
Image 43% · 1.1 MiB
Font 6% · 143.3 KiB
Document 3% · 74.8 KiB
CSS 2% · 44.0 KiB
Other 1% · 17.0 KiB
~36.3 KiB of savings available
Remove unused JavaScript: 36.3 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 225 resources | 2.5 MiB | ||||||
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Third-Party Impact8% third-party, 0 ms blockingPASS
Third-Party Impact
8% third-party, 0 ms blocking
8% third-party, 0 ms blocking
Info::
Third-party code accounts for 8% of page weight (213.6 KiB of 2.5 MiB)
Info::
Third-party blocking time is low (0 ms)
92%
First-party Third-party
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
AImage Optimization12 images, 0 KB saveablePASS
Image Optimization
12 images, 0 KB saveable
12 images, 0 KB saveable
Info::
All images are well-optimized
12 images 1.1 MB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+Font Loading3 fonts (143 KB)PASS
Font Loading
3 fonts (143 KB)
3 fonts (143 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
3
143 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
manuale_n3.0baac6564b6e... woff2 swap
Size 18 KB
Load time 29 ms
Start 216 ms
Risk FOUT — text flashes from fallback to web font
GTStandard-MSemibold.woff2 woff2 swap
Size 63 KB
Load time 42 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
GTStandard-MRegular.woff2 woff2 swap
Size 62 KB
Load time 46 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
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+JS Bundles151 scripts, 36 KB unusedPASS
JS Bundles
151 scripts, 36 KB unused
151 scripts, 36 KB unused
Warning::
https://www.crystillery.com/cdn/wpm/b5982071ew7ea4...: 36 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 36 KB
36 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.crystillery.com/cdn/wpm/b5982071ew7ea472e3p69b68784m2150dfeam.js | 81 KB | 36 KB (45%) | ✓ | 1st |
| https://www.crystillery.com/cdn/shopifycloud/checkout-web/assets/c1/shared-report-graphql-error.d-L7q9TK.js | 2 KB | — | ✓ | 1st |
| https://www.crystillery.com/cdn/shopifycloud/checkout-web/assets/c1/helpers-derivations.DLW2fhKL.js | 2 KB | — | ✓ | 1st |
| https://cdn.shopify.com/storefront/standard-actions.js | 5 KB | — | ✓ | 3rd |
| https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/client.init-shop-cart-sync_QWWBlVah.en.esm.js | 1 KB | — | ✓ | 3rd |
| https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.document_DMcRsBXN.esm.js | 1 KB | — | ✓ | 3rd |
| https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.init_BGr_2SLX.esm.js | 1 KB | — | ✓ | 3rd |
| https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.register_CkC56SUN.esm.js | 21 KB | — | ✓ | 3rd |
| https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.tslib-es6_CHHZATl5.esm.js | 1 KB | — | ✓ | 3rd |
| https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.networkErrorMessages_DIkDbO6W.esm.js | 1 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
A+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource Hints142 hints, 0 missing preconnectsPASS
Resource Hints
142 hints, 0 missing preconnects
142 hints, 0 missing preconnects
Info::
Page uses 142 resource hint(s)
Current Resource Hints
preconnect 3
preload 1
dns-prefetch 1
prefetch
+127
137142 resource hints configured
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+Asset CompressionAll 1 asset host use brotliPASS
Asset Compression
All 1 asset host use brotli
All 1 asset host use brotli
Info::
cdn.shopify.com serves assets with brotli (assets: 4)
Got: cdn.shopify.com (text/javascript)
A+LCP Image PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Server Response Intelligence1 server-response signal(s) detectedPASS
Server Response Intelligence
1 server-response signal(s) detected
1 server-response signal(s) detected
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
Render-Blocking Resources
No render-blocking resources detected
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+Third-Party ResourcesNo third-party resources detectedPASS
Third-Party Resources
No third-party resources detected
No third-party resources detected
A+JavaScript BlockingNo render-blocking JS or document.write usage detectedPASS
JavaScript Blocking
No render-blocking JS or document.write usage detected
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
ACSS Performance Depth1 CSS depth issue(s) detectedPASS
CSS Performance Depth
1 CSS depth issue(s) detected
1 CSS depth issue(s) detected
Warning::
31 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
Network Waterfall225 requests over 5020msINFO
Network Waterfall
225 requests over 5020ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
6% of JavaScript execution is third-party
First-party Third-party 138ms · 21KB · €1/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
cdn.shopify.com cdn.shopify.com | Other | 138ms | 21 KB | — | €1/mo | Optional |
cdn.shopify.com
Other
Execution 138ms
Transfer 21 KB
Monthly Cost €1/mo
Image Optimization12 images, 430 KB total, 0 KB wastedINFO
Image Optimization
12 images, 430 KB total, 0 KB wasted
Image Optimization Audit
Total Images
12
Total Size
430 KB
3 missing dimensions
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.