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

100

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.

745 ms

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

1.35 s

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

4 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.083

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.07 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.

2.21 s

Page Load Progression

803 ms

1.6 s

2.4 s

3.2 s

4.0 s

4.8 s

5.6 s

6.4 s

Checks

16 PASS 2 REVIEW 2 FIX

Page Weight Budget

Action

3.8 MB transferred, 424 requests

FIX

3.8 MB transferred, 424 requests

Page weighs 5.9 MB (3.8 MB transferred)

Images are 1.7 MB — compress or use modern formats

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

Got: 1.7 MB

JavaScript is 652 KB — consider code splitting or lazy loading

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

Got: 652 KB

424 HTTP requests — consider bundling or reducing

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

Estimated 0.79 g CO2 per page load

3.8 MB transferred

424 requests

0.79 g CO2 per page load

Images 1.7 MiB 45%

Other 840.7 KiB 22%

JavaScript 652.1 KiB 17%

HTML 273.1 KiB 7%

Fonts 141.7 KiB 4%

CSS 96.2 KiB 3%

Other 58.9 KiB 2%

Other 50.0 KiB 1%

Other 6.3 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

JS Execution Cost

Action

4775ms total JS execution

FIX

4775ms total JS execution

https://www.mossandmolt.com/: 3637ms CPU time

Unattributable: 310ms CPU time

https://www.mossandmolt.com/cdn/shop/t/18/assets/m...: 199ms CPU time

https://www.mossandmolt.com/cdn/wpm/b610a19cewf693...: 195ms CPU time

https://cdn.shopify.com/extensions/01a18d57-d208-7...: 168ms CPU time

Third-party scripts: 295ms (6% of total)

Main Thread Breakdown

Style & Layout 64% Other 15% Script Evaluation 15% Rendering 4%

Script	Total	Scripting	Parse/Compile	Party
https://www.mossandmolt.com/	3637ms	213ms	30ms	1st
Unattributable	310ms	23ms	0ms	1st
https://www.mossandmolt.com/cdn/shop/t/18/assets/mm-shrimp-bar.js?v=120813251631150360881793383007	199ms	18ms	0ms	1st
https://www.mossandmolt.com/cdn/wpm/b610a19cewf693d529pf324840bm6169d9b4m.js	195ms	151ms	5ms	1st
https://cdn.shopify.com/extensions/01a18d57-d208-7bfa-9eb8-ea7f7d250fe5/judgeme-838/assets/loader.js	168ms	81ms	0ms	3rd
https://www.mossandmolt.com/cdn/shop/t/18/assets/mm-oct15-nav.js?v=65700980751981609241793391424	82ms	8ms	0ms	1st
https://cdn.shopify.com/storefront/web-components/account.js	73ms	10ms	0ms	3rd
https://www.mossandmolt.com/cdn/shopifycloud/storefront/assets/storefront/remote_product_tracking-91d95044.js	56ms	34ms	1ms	1st
https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.register_oML0Hu4L.esm.js	53ms	30ms	0ms	3rd

Page Weight Inventory

Action

424 resources · 3.8 MB · 35 KB savings available

REVIEW

424 resources · 3.8 MB · 35 KB savings available

Page weight 3.8 MB exceeds 1 MB target by 2.8 MB

Got: 3.8 MB Expected: ≤ 1 MB

194 third-party resources (21% of weight)

3 resources over 200KB

424 resources · 3.8 MiB · 194 third-party 2.8 MiB over 1MB target

Image 45% · 1.7 MiB

JavaScript 40% · 1.5 MiB

Document 8% · 292.7 KiB

Font 4% · 141.7 KiB

CSS 3% · 102.2 KiB

Other 1% · 40.0 KiB

~35.1 KiB of savings available

Remove unused JavaScript: 35.1 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

424 resources			3.8 MiB

HTTP Caching

private, max-age=0, must-revalidate

REVIEW

private, max-age=0, must-revalidate

Cache-Control header is set

Got: private, max-age=0, must-revalidate

ETag present — enables conditional (304) responses

Cache-Control

private, max-age=0, must-revalidate

Directive	Value	Meaning
private	—	Only browser cache, not CDN/proxy
max-age	0	Cache for 0 seconds
must-revalidate	—	Must recheck with server after expiry

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 (791.2 KiB of 3.8 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

42 images, 0 KB saveable

PASS

42 images, 0 KB saveable

All images are well-optimized

42 images 1.7 MB

0 oversized -0 KB

2 legacy format

0 missing dimensions CLS risk

A+

Font Loading

5 fonts (142 KB)

PASS

5 fonts (142 KB)

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

Web fonts

142 KB total

Render-blocking

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

mossmolt-jersey20.woff2 woff2 swap

Size 29 KB

Load time 40 ms

Start 200 ms