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

100

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.

625 ms

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

2.20 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.

1.14 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.

2.24 s

Page Load Progression

774 ms

1.5 s

2.3 s

3.1 s

3.9 s

4.6 s

5.4 s

6.2 s

Checks

14 PASS 3 REVIEW 3 FIX

Page Weight Budget

Action

3.2 MB transferred, 252 requests

FIX

3.2 MB transferred, 252 requests

Page weighs 4.0 MB (3.2 MB transferred)

Images are 1.5 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 1.5 MB

Fonts are 500 KB — consider subsetting or using system fonts

Subset fonts to include only used characters, or switch to system font stacks.

Got: 500 KB

252 HTTP requests — consider bundling or reducing

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

Estimated 0.68 g CO2 per page load

3.2 MB transferred

252 requests

0.68 g CO2 per page load

Images 1.5 MiB 46%

Other 745.3 KiB 23%

Fonts 499.7 KiB 15%

JavaScript 346.7 KiB 10%

HTML 76.8 KiB 2%

CSS 65.4 KiB 2%

Other 48.9 KiB 1%

Other 6.6 KiB 0%

Other 2.4 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

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.

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

4793ms total JS execution

FIX

4793ms total JS execution

https://lovelyhair.shop/: 4135ms CPU time

https://lovelyhair.shop/cdn/shop/t/13/assets/globa...: 279ms CPU time

Unattributable: 241ms CPU time

https://lovelyhair.shop/cdn/wpm/bec790c88wf78f89cd...: 79ms CPU time

https://lovelyhair.shop/cdn/shopifycloud/storefron...: 59ms CPU time

Main Thread Breakdown

Other 59% Style & Layout 29% Script Evaluation 7% Rendering 4%

Script	Total	Scripting	Parse/Compile	Party
https://lovelyhair.shop/	4135ms	54ms	11ms	1st
https://lovelyhair.shop/cdn/shop/t/13/assets/global.js?v=46603718469393930171790899505	279ms	14ms	0ms	1st
Unattributable	241ms	8ms	0ms	1st
https://lovelyhair.shop/cdn/wpm/bec790c88wf78f89cdp106eb8c0mb54b3ae5m.js	79ms	49ms	6ms	1st
https://lovelyhair.shop/cdn/shopifycloud/storefront/assets/shop_events_listener-4e26a9ce.js	59ms	30ms	1ms	1st

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

135 scripts, 67 KB unused

REVIEW

135 scripts, 67 KB unused

https://lovelyhair.shop/cdn/wpm/bec790c88wf78f89cd...: 46 KB unused (55%)

Consider code splitting or tree shaking to reduce unused code.

https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7....: 20 KB unused (76%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 67 KB

67 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://lovelyhair.shop/cdn/wpm/bec790c88wf78f89cdp106eb8c0mb54b3ae5m.js	85 KB	46 KB (55%)	✓	1st
https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js	27 KB	20 KB (76%)	✓	3rd
https://lovelyhair.shop/checkouts/internal/preloads.js?locale=en-FR	4 KB	—	✓	1st
https://shop.app/checkouts/internal/preloads.js?locale=en-FR&shop_id=95377490287	0 KB	—	✓	3rd
https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/loader.init-shop-cart-sync.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_DOQ7rkrY.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.window_CAbVMZox.esm.js	1 KB	—	✓	3rd
https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.init_CWcpnDvP.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

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

252 resources · 3.2 MB · 67 KB savings available

REVIEW

252 resources · 3.2 MB · 67 KB savings available

Page weight 3.2 MB exceeds 1 MB target by 2.2 MB

Got: 3.2 MB Expected: ≤ 1 MB

~67 KB of savings available

46 third-party resources (3% of weight)

1 resources over 200KB

252 resources · 3.2 MiB · 46 third-party 2.2 MiB over 1MB target

Image 46% · 1.5 MiB

JavaScript 34% · 1.1 MiB

Font 15% · 499.7 KiB

Document 2% · 82.1 KiB

CSS 2% · 65.4 KiB

Other 1% · 25.0 KiB

~66.6 KiB of savings available

Remove unused JavaScript: 66.6 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

252 resources			3.2 MiB

A+

Third-Party Impact

3% third-party, 0 ms blocking

PASS

3% third-party, 0 ms blocking

Third-party code accounts for 3% of page weight (105.8 KiB of 3.2 MiB)

Third-party blocking time is low (0 ms)

97%

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

40 images, 0 KB saveable

PASS

40 images, 0 KB saveable

All images are well-optimized

40 images 1.5 MB

0 oversized -0 KB

0 legacy format

0 missing dimensions CLS risk

A+

Font Loading

3 fonts (500 KB)

PASS

3 fonts (500 KB)

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

Web fonts

500 KB total

Render-blocking

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

inter-latin.woff2 woff2 swap

Size 173 KB

Load time 62 ms

Start 173 ms

Risk FOUT — text flashes from fallback to web font

Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need

playfair-latin.woff2 woff2 swap

Size 153 KB

Load time 71 ms

Start 173 ms

Risk FOUT — text flashes from fallback to web font

Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need

inter-italic-latin.woff2 woff2 swap

Size 175 KB

Load time 60 ms

Start 577 ms

Risk FOUT — text flashes from fallback to web font

Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need

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 ~250 KB and ~500 ms

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+

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: 10)

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

18 Server-Timing entries advertised

PASS

18 Server-Timing entries advertised

Server-Timing header advertises 18 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+

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

252 requests over 6257ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Image Optimization

76 images, 693 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

693 KB

5 missing lazy loading

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