Performance

· 23 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.

619 ms

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

1.49 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.

1.40 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.

1.51 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 s

Checks

14 PASS 4 REVIEW 2 FIX

Page Weight Budget

Action

3.3 MB transferred, 422 requests

FIX

3.3 MB transferred, 422 requests

Page weighs 4.6 MB (3.3 MB transferred)

Images are 1.2 MB — compress or use modern formats

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

Got: 1.2 MB

JavaScript is 657 KB — consider code splitting or lazy loading

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

Got: 657 KB

422 HTTP requests — consider bundling or reducing

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

Estimated 0.69 g CO2 per page load

3.3 MB transferred

422 requests

0.69 g CO2 per page load

Images 1.2 MiB 37%

Other 1.1 MiB 34%

JavaScript 656.8 KiB 19%

Fonts 171.0 KiB 5%

HTML 116.3 KiB 3%

CSS 49.9 KiB 1%

Other 10.9 KiB 0%

Other 6.6 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

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

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 Execution Cost

Action

1149ms total JS execution

REVIEW

1149ms total JS execution

https://voglastore.com/: 717ms CPU time

Unattributable: 349ms CPU time

https://voglastore.com/cdn/wpm/b264bf420w2e1681cap...: 83ms CPU time

Main Thread Breakdown

Other 34% Style & Layout 29% Script Evaluation 27% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
https://voglastore.com/	717ms	46ms	9ms	1st
Unattributable	349ms	8ms	0ms	1st
https://voglastore.com/cdn/wpm/b264bf420w2e1681cap8d55857fm7d879f9cm.js	83ms	58ms	5ms	1st

JS Bundles

265 scripts, 68 KB unused

REVIEW

265 scripts, 68 KB unused

https://voglastore.com/cdn/wpm/b264bf420w2e1681cap...: 46 KB unused (55%)

Consider code splitting or tree shaking to reduce unused code.

https://cdn.shopify.com/storefront/web-components/...: 22 KB unused (52%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 68 KB

68 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://voglastore.com/cdn/wpm/b264bf420w2e1681cap8d55857fm7d879f9cm.js	85 KB	46 KB (55%)	✓	1st
https://cdn.shopify.com/storefront/web-components/chat/agent-runtime-DqFtYUdX.js	43 KB	22 KB (52%)	✓	3rd
https://voglastore.com/cdn/shop/t/5/assets/constants.js?v=132983761750457495441757085207	1 KB	—	✓	1st
https://voglastore.com/cdn/shop/t/5/assets/pubsub.js?v=25310214064522200911757085208	1 KB	—	✓	1st
https://voglastore.com/cdn/shop/t/5/assets/global.js?v=7301445359237545521757085207	9 KB	—	✓	1st
https://voglastore.com/cdn/shop/t/5/assets/details-disclosure.js?v=13653116266235556501757085207	1 KB	—	✓	1st
https://voglastore.com/cdn/shop/t/5/assets/details-modal.js?v=25581673532751508451757085207	1 KB	—	✓	1st
https://voglastore.com/cdn/shop/t/5/assets/search-form.js?v=133129549252120666541757085208	1 KB	—	✓	1st
https://voglastore.com/cdn/shop/t/5/assets/animations.js?v=88693664871331136111757085207	2 KB	—	✓	1st
https://voglastore.com/checkouts/internal/preloads.js?locale=en-FR	4 KB	—	✓	1st

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

422 resources · 3.3 MB · 68 KB savings available

REVIEW

422 resources · 3.3 MB · 68 KB savings available

Page weight 3.3 MB exceeds 1 MB target by 2.3 MB

Got: 3.3 MB Expected: ≤ 1 MB

~68 KB of savings available

138 third-party resources (21% of weight)

422 resources · 3.3 MiB · 138 third-party 2.3 MiB over 1MB target

JavaScript 47% · 1.5 MiB

Image 41% · 1.3 MiB

Font 5% · 171.0 KiB

CSS 4% · 126.6 KiB

Document 4% · 123.1 KiB

Other 1% · 17.6 KiB

~68.0 KiB of savings available

Remove unused JavaScript: 68.0 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

422 resources			3.3 MiB

Third-Party Impact

21% third-party, 0 ms blocking

PASS

21% third-party, 0 ms blocking

Third-party code accounts for 21% of page weight (728.3 KiB of 3.3 MiB)

Third-party blocking time is low (0 ms)

79%

21%

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

35 images, 0 KB saveable

PASS

35 images, 0 KB saveable

https://cdn.shopify.com/s/files/1/0556/1384/9807/f... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

35 images 1.2 MB

0 oversized -0 KB

1 legacy format

1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

A+

Font Loading

5 fonts (171 KB)

PASS

5 fonts (171 KB)

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

Web fonts

171 KB total

Render-blocking

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

comfortaa_n4.a743a7214d... woff2 swap

Size 16 KB

Load time 34 ms

Start 442 ms