Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop

Performance

Accessibility

100

Best Practices

100

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

574 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

1.34 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 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.

1.32 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.

1.37 s

Page Load Progression

488 ms

976 ms

1.5 s

2.0 s

2.4 s

2.9 s

3.4 s

3.9 s

Checks

13 PASS 5 REVIEW 2 FIX

Page Weight Budget

Action

2.4 MB transferred, 229 requests

FIX

2.4 MB transferred, 229 requests

Page weighs 2.4 MB (2.4 MB transferred)

229 HTTP requests — consider bundling or reducing

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Estimated 0.50 g CO2 per page load

2.4 MB transferred

229 requests

0.50 g CO2 per page load

Images 986.8 KiB 40%

Other 875.3 KiB 36%

JavaScript 303.4 KiB 12%

Fonts 143.3 KiB 6%

HTML 68.5 KiB 3%

CSS 44.1 KiB 2%

Other 10.2 KiB 0%

Other 6.8 KiB 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Approaching limit

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

HTTP Caching

Action

No cache headers

FIX

No cache headers

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.

Document Compression

Action

Document response served uncompressed

REVIEW

Document response served uncompressed

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.

Main HTML Cache-Control

No Cache-Control header on main HTML response

REVIEW

No Cache-Control header on main HTML response

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.

Server-Timing Observability

No Server-Timing header found

REVIEW

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.

Page Weight Inventory

Action

229 resources · 2.4 MB · 37 KB savings available

REVIEW

229 resources · 2.4 MB · 37 KB savings available

Page weight 2.4 MB exceeds 1 MB target by 1.4 MB

Got: 2.4 MB Expected: ≤ 1 MB

60 third-party resources (9% of weight)

1 resources over 200KB

229 resources · 2.4 MiB · 60 third-party 1.4 MiB over 1MB target

JavaScript 48% · 1.1 MiB

Image 41% · 988.7 KiB

Font 6% · 143.3 KiB

Document 3% · 74.8 KiB

CSS 2% · 44.1 KiB

Other 1% · 15.9 KiB

~36.6 KiB of savings available

Remove unused JavaScript: 36.6 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

229 resources			2.4 MiB

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Third-Party Impact

9% third-party, 0 ms blocking

PASS

9% third-party, 0 ms blocking

Third-party code accounts for 9% of page weight (213.0 KiB of 2.4 MiB)

Third-party blocking time is low (0 ms)

91%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

Image Optimization

12 images, 0 KB saveable

PASS

12 images, 0 KB saveable

All images are well-optimized

12 images 987 KB

0 oversized -0 KB

3 legacy format

0 missing dimensions CLS risk

A+

JS Execution Cost

378ms total JS execution

PASS

378ms total JS execution

https://www.crystillery.com/: 158ms CPU time

Unattributable: 152ms CPU time

https://www.crystillery.com/cdn/wpm/b5982071ew7ea4...: 68ms CPU time

Main Thread Breakdown

Script Evaluation 42% Other 37% Style & Layout 12%

Script	Total	Scripting	Parse/Compile	Party
https://www.crystillery.com/	158ms	20ms	4ms	1st
Unattributable	152ms	7ms	0ms	1st
https://www.crystillery.com/cdn/wpm/b5982071ew7ea472e3p69b68784m2150dfeam.js	68ms	52ms	5ms	1st

A+

Font Loading

3 fonts (143 KB)

PASS

3 fonts (143 KB)

3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

143 KB total

Render-blocking

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 40 ms

Start 177 ms

Risk FOUT — text flashes from fallback to web font

GTStandard-MSemibold.woff2 woff2 swap

Size 63 KB

Load time 46 ms

Start 798 ms

Risk FOUT — text flashes from fallback to web font

GTStandard-MRegular.woff2 woff2 swap

Size 62 KB

Load time 42 ms

Start 798 ms

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 Bundles

155 scripts, 37 KB unused

PASS

155 scripts, 37 KB unused

https://www.crystillery.com/cdn/wpm/b5982071ew7ea4...: 37 KB unused (46%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 37 KB

37 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	37 KB (46%)	✓	1st
https://www.crystillery.com/cdn/shop/t/2/assets/constants.js?v=95358004781563950421685405334	1 KB	—	✓	1st
https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/loader.init-shop-cart-sync.en.esm.js	1 KB	—	✓	3rd
https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/loader.shop-follow-button.en.esm.js	1 KB	—	✓	3rd
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

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 Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

HTTP/3 (QUIC)

HTTP/3 advertised via Alt-Svc

PASS

HTTP/3 advertised via Alt-Svc

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 Compression

All 1 asset host use brotli

PASS

All 1 asset host use brotli

cdn.shopify.com serves assets with brotli (assets: 4)

Got: cdn.shopify.com (text/javascript)

A+

LCP Image Preload

LCP preload audit not available

PASS

LCP preload audit not available

LCP image preload audit not available for this scan

A+

Server Response Intelligence

1 server-response signal(s) detected

PASS

1 server-response signal(s) detected

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.

Network Waterfall

229 requests over 4144ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Image Optimization

12 images, 430 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

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.