https://ateliervalere.myshopify.com
Performance
· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
87
GRADE
B
FIX
2
REVIEW
4
PASS
14
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
96
98
96
92
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
375 ms
750 ms
1.1 s 1.5 s 1.9 s 2.2 s 2.6 s 3.0 sChecks
2314 PASS 4 REVIEW 2 FIX
DPage Weight BudgetAction2.5 MB transferred, 304 requestsFIX
Page Weight Budget
Action2.5 MB transferred, 304 requests
2.5 MB transferred, 304 requests
Warning::
Page weighs 3.8 MB (2.5 MB transferred)
Warning::
JavaScript is 741 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 741 KB
Warning::
304 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
304 requests
0.52 g CO2 per page load
Other 839.9 KiB 33%
JavaScript 741.4 KiB 29%
Images 644.8 KiB 25%
Fonts 125.6 KiB 5%
HTML 81.5 KiB 3%
CSS 76.1 KiB 3%
Other 16.3 KiB 1%
Other 12.7 KiB 1%
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
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.
Info::
ETag present — enables conditional (304) responses
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BJS Execution Cost900ms total JS executionREVIEW
JS Execution Cost
900ms total JS execution
900ms total JS execution
Warning::
Unattributable: 361ms CPU time
Warning::
https://ateliervalere.myshopify.com/: 273ms CPU time
Info::
https://ateliervalere.myshopify.com/cdn/wpm/bc8540...: 84ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-6KDE...: 69ms CPU time
Info::
https://cdn.shopify.com/storefront/web-components/...: 63ms CPU time
Info::
Third-party scripts: 132ms (15% of total)
Main Thread Breakdown
Script Evaluation 39% Other 39% Style & Layout 13% Parse HTML & CSS 3%
| 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
JS Bundles
228 scripts, 104 KB unused
228 scripts, 104 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-6KDE...: 70 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ateliervalere.myshopify.com/cdn/wpm/bc8540...: 34 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
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 (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.
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
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.
CPage Weight InventoryAction304 resources · 2.5 MB · 104 KB savings availableREVIEW
Page Weight Inventory
Action304 resources · 2.5 MB · 104 KB savings available
304 resources · 2.5 MB · 104 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::
~104 KB of savings available
Info::
122 third-party resources (38% of weight)
Info::
2 resources over 200KB
304 resources · 2.5 MiB · 122 third-party 1.5 MiB over 1MB target
JavaScript 62% · 1.5 MiB
Image 25% · 644.8 KiB
Font 5% · 125.6 KiB
Document 4% · 97.2 KiB
CSS 3% · 81.4 KiB
Other 1% · 20.9 KiB
~103.6 KiB of savings available
Remove unused JavaScript: 103.6 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 304 resources | 2.5 MiB | ||||||
AThird-Party Impact38% third-party, 0 ms blockingPASS
Third-Party Impact
38% third-party, 0 ms blocking
38% third-party, 0 ms blocking
Info::
Third-party code accounts for 38% of page weight (960.3 KiB of 2.5 MiB)
Info::
Third-party blocking time is low (0 ms)
62%
38%
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.
A+Image Optimization11 images, 0 KB saveablePASS
Image Optimization
11 images, 0 KB saveable
11 images, 0 KB saveable
Info::
All images are well-optimized
11 images 645 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+Font Loading4 fonts (126 KB)PASS
Font Loading
4 fonts (126 KB)
4 fonts (126 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
126 KB total
Render-blocking
0
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 105 ms
Start 347 ms
Risk FOUT — text flashes from fallback to web font
bodonimoda_n4.025af1859... woff2 swap
Size 29 KB
Load time 145 ms
Start 347 ms
Risk FOUT — text flashes from fallback to web font
redhattext_n7.01cb72516... woff2 swap
Size 16 KB
Load time 101 ms
Start 471 ms
Risk FOUT — text flashes from fallback to web font
GTStandard-MMedium.woff2 woff2 swap
Size 64 KB
Load time 50 ms
Start 1.6 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 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 HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
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+Document CompressionDocument response uses brotliPASS
Document Compression
Document response uses brotli
Document response uses brotli
Info::
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 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: 7)
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-Timing Observability17 Server-Timing entries advertisedPASS
Server-Timing Observability
17 Server-Timing entries advertised
17 Server-Timing entries advertised
Info::
Server-Timing header advertises 17 timing entries
A+Server Response Intelligence2 server-response signal(s) detectedPASS
Server Response Intelligence
2 server-response signal(s) detected
2 server-response signal(s) detected
Info::
`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).
Info::
`ETag` present -- conditional GET supported
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall304 requests over 5232msINFO
Network Waterfall
304 requests over 5232ms
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
15% of JavaScript execution is third-party
First-party Third-party 132ms · 183KB · €1/mo
| 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 |
Google Tag Manager
Tag Manager
Execution 69ms
Transfer 173 KB
Unused 40%
Monthly Cost €0/mo
cdn.shopify.com
Other
Execution 63ms
Transfer 10 KB
Monthly Cost €0/mo
Image Optimization18 images, 458 KB total, 137 KB wastedINFO
Image Optimization
18 images, 458 KB total, 137 KB wasted
Image Optimization Audit
Total Images
18
Total Size
458 KB
Oversized
2
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.