Performance

· 27 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

Best Practices

SEO

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

4.43 s

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

12.43 s

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

258 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.

7.06 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.

13.63 s

Page Load Progression

375 ms

750 ms

1.1 s

1.5 s

1.9 s

2.2 s

2.6 s

3.0 s

Checks

18 PASS 3 REVIEW 3 FIX

Page Weight Budget

Action

3.0 MB transferred, 326 requests

FIX

3.0 MB transferred, 326 requests

Page weighs 4.1 MB (3.0 MB transferred)

JavaScript is 743 KB — consider code splitting or lazy loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Got: 743 KB

326 HTTP requests — consider bundling or reducing

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

Estimated 0.62 g CO2 per page load

3.0 MB transferred

326 requests

0.62 g CO2 per page load

Images 989.5 KiB 33%

Other 979.9 KiB 32%

JavaScript 743.2 KiB 25%

Fonts 125.6 KiB 4%

HTML 81.5 KiB 3%

CSS 76.1 KiB 3%

Other 16.3 KiB 1%

Other 13.9 KiB 0%

Other 195 B 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

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.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

JS Execution Cost

Action

3789ms total JS execution

FIX

3789ms total JS execution

Unattributable: 1382ms CPU time

https://ateliervalere.myshopify.com/: 807ms CPU time

https://ateliervalere.myshopify.com/cdn/wpm/bc8540...: 481ms CPU time

https://www.googletagmanager.com/gtag/js?id=G-6KDE...: 214ms CPU time

https://cdn.shopify.com/shopifycloud/shop-js/modul...: 209ms CPU time

Third-party scripts: 678ms (18% of total)

Main Thread Breakdown

Script Evaluation 43% Other 40% Style & Layout 10% Script Parsing & Compilation 3% Parse HTML & CSS 3%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	1382ms	153ms	0ms	1st
https://ateliervalere.myshopify.com/	807ms	113ms	23ms	1st
https://ateliervalere.myshopify.com/cdn/wpm/bc8540278we853e1abpb62b2c4amde256306m.js	481ms	401ms	20ms	1st
https://www.googletagmanager.com/gtag/js?id=G-6KDE90CKZE	214ms	162ms	41ms	3rd
https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.register_CyWSTojb.esm.js	209ms	132ms	0ms	3rd
https://ateliervalere.myshopify.com/cdn/s/trekkie.storefront.f1ba865b3fecd812ad617f74ac079261075e9edb.min.js	142ms	127ms	13ms	1st
https://ateliervalere.myshopify.com/cdn/shopifycloud/perf-kit/shopify-perf-kit-3.9.4.min.js	134ms	105ms	8ms	1st
https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.debounce_C-IIq26m.esm.js	71ms	70ms	0ms	3rd
https://cdn.shopify.com/storefront/web-components/account.js	68ms	31ms	0ms	3rd
https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.useEventListener_D5-R6De3.esm.js	62ms	55ms	0ms	3rd

Showing top 10 of 14 scripts

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.

ETag present — enables conditional (304) responses

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

JS Bundles

243 scripts, 104 KB unused

REVIEW

243 scripts, 104 KB unused

https://www.googletagmanager.com/gtag/js?id=G-6KDE...: 70 KB unused (41%)

Consider code splitting or tree shaking to reduce unused code.

https://ateliervalere.myshopify.com/cdn/wpm/bc8540...: 34 KB unused (43%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 104 KB

104 KB unused JavaScript

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 (41%)	✓	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.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

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.

Page Weight Inventory

Action

326 resources · 3.0 MB · 104 KB savings available

REVIEW

326 resources · 3.0 MB · 104 KB savings available

Page weight 3.0 MB exceeds 1 MB target by 2.0 MB

Got: 3.0 MB Expected: ≤ 1 MB

~104 KB of savings available

125 third-party resources (32% of weight)

2 resources over 200KB

326 resources · 3.0 MiB · 125 third-party 2.0 MiB over 1MB target

JavaScript 55% · 1.6 MiB

Image 33% · 989.5 KiB

Font 4% · 125.6 KiB

CSS 4% · 113.7 KiB

Document 3% · 97.2 KiB

Other 1% · 22.1 KiB

~104.0 KiB of savings available

Remove unused JavaScript: 104.0 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

326 resources			3.0 MiB

Third-Party Impact

32% third-party, 0 ms blocking

PASS

32% third-party, 0 ms blocking

Third-party code accounts for 32% of page weight (962.1 KiB of 3.0 MiB)

Third-party blocking time is low (0 ms)

68%

32%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Image Optimization

11 images, 0 KB saveable

PASS

11 images, 0 KB saveable

All images are well-optimized

11 images 989 KB

0 oversized -0 KB

1 legacy format

0 missing dimensions CLS risk

A+

Font Loading

4 fonts (126 KB)

PASS

4 fonts (126 KB)

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

Web fonts

126 KB total

Render-blocking

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

redhattext_n4.f45549d85... woff2 swap

Size 16 KB

Load time 34 ms

Start 390 ms

Risk FOUT — text flashes from fallback to web font

bodonimoda_n4.025af1859... woff2 swap

Size 29 KB

Load time 38 ms

Start 390 ms

Risk FOUT — text flashes from fallback to web font

redhattext_n7.01cb72516... woff2 swap

Size 16 KB

Load time 181 ms

Start 463 ms

Risk FOUT — text flashes from fallback to web font

GTStandard-MMedium.woff2 woff2 swap

Size 64 KB

Load time 74 ms

Start 3.0 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+

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

Resource Hints

140 hints, 0 missing preconnects

PASS

140 hints, 0 missing preconnects

1 dns-prefetch redundant with preconnect on same origin

preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://cdn.ecomposer.app. Remove the redundant dns-prefetch entries.

3 URL(s) appear in multiple hints

The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: //ateliervalere.myshopify.com/cdn/fonts/bodoni_moda/bodonimoda_n4.025af1859727a91866b3c708393a6dc972156491.woff2 (preload+preload), //ateliervalere.myshopify.com/cdn/fonts/red_hat_text/redhattext_n4.f45549d853e5e3e2907f21be9aecf95e1eaa7516.woff2 (preload+preload), https://cdn.ecomposer.app (preconnect+dns-prefetch).

Page uses 140 resource hint(s)

Current Resource Hints

preconnect

preload

dns-prefetch

prefetch

+121

131

140 resource hints configured

preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://cdn.ecomposer.app. Remove the redundant dns-prefetch entries.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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+

Document Compression

Document response uses brotli

PASS

Document response uses brotli

Main HTML response uses brotli (Content-Encoding: br)

Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.

A+

Asset Compression

All 1 asset host use brotli

PASS

All 1 asset host use brotli

cdn.shopify.com serves assets with brotli (assets: 7)

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-Timing Observability

17 Server-Timing entries advertised

PASS

17 Server-Timing entries advertised

Server-Timing header advertises 17 timing entries

A+

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

`Vary` header declared: accept-encoding

The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).

`ETag` present -- conditional GET supported

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

JavaScript Blocking

1 JS blocking issue(s) detected

PASS

1 JS blocking issue(s) detected

Total JS execution time is 3.8 s -- over the 3.5s budget

Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.

A+

CSS Performance Depth

No CSS performance depth issues detected

PASS

No CSS performance depth issues detected

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall

326 requests over 6507ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

18% of JavaScript execution is third-party

First-party Third-party 678ms · 215KB · €4/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Google Tag Manager www.googletagmanager.com	Tag Manager	214ms	173 KB	41%	€1/mo	Costly
cdn.shopify.com cdn.shopify.com	Other	209ms	21 KB	—	€1/mo	Costly
cdn.shopify.com cdn.shopify.com	Other	71ms	1 KB	—	€0/mo	Optional
cdn.shopify.com cdn.shopify.com	Other	68ms	10 KB	—	€0/mo	Optional
cdn.shopify.com cdn.shopify.com	Other	62ms	1 KB	—	€0/mo	Optional
cdn.shopify.com cdn.shopify.com	Other	54ms	8 KB	—	€0/mo	Optional

Google Tag Manager

Tag Manager

Costly

Execution 214ms

Transfer 173 KB

Unused 41%

Monthly Cost €1/mo

cdn.shopify.com

Other

Costly

Execution 209ms

Transfer 21 KB

Monthly Cost €1/mo

cdn.shopify.com

Other

Optional

Execution 71ms

Transfer 1 KB

Monthly Cost €0/mo

cdn.shopify.com

Other

Optional

Execution 68ms

Transfer 10 KB

Monthly Cost €0/mo

cdn.shopify.com

Other

Optional

Execution 62ms

Transfer 1 KB

Monthly Cost €0/mo

cdn.shopify.com

Other

Optional

Execution 54ms

Transfer 8 KB

Monthly Cost €0/mo

These scripts may cost more than they're worth

Google Tag Manager adds 214ms and costs ~€1/month
cdn.shopify.com adds 209ms and costs ~€1/month

Google Tag Manager takes 214ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cdn.shopify.com takes 209ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

Image Optimization

18 images, 458 KB total, 137 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

458 KB

Oversized

Wasted

137 KB

6 missing lazy loading

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.