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

100

SEO

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

657 ms

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

1.13 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.

0.026

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

1.41 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.

1.13 s

Page Load Progression

861 ms

1.7 s

2.6 s

3.4 s

4.3 s

5.2 s

6.0 s

6.9 s

Checks

16 PASS 2 REVIEW 2 FIX

Page Weight Budget

Action

4.2 MB transferred, 411 requests

FIX

4.2 MB transferred, 411 requests

Page weighs 6.3 MB (4.2 MB transferred)

Images are 2.2 MB — compress or use modern formats

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

Got: 2.2 MB

JavaScript is 578 KB — consider code splitting or lazy loading

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

Got: 578 KB

411 HTTP requests — consider bundling or reducing

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

Estimated 0.87 g CO2 per page load

4.2 MB transferred

411 requests

0.87 g CO2 per page load

Images 2.2 MiB 52%

Other 812.7 KiB 19%

JavaScript 578.5 KiB 14%

HTML 187.3 KiB 4%

Fonts 179.4 KiB 4%

Other 126.1 KiB 3%

CSS 86.0 KiB 2%

Other 56.8 KiB 1%

Other 3.3 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

4543ms total JS execution

FIX

4543ms total JS execution

https://www.mossandmolt.com/: 3399ms CPU time

Unattributable: 304ms CPU time

https://www.mossandmolt.com/cdn/wpm/bf882002ew93f4...: 246ms CPU time

https://www.mossandmolt.com/cdn/shop/t/18/assets/m...: 170ms CPU time

https://cdn.shopify.com/extensions/01a1c05e-97bc-7...: 167ms CPU time

Third-party scripts: 300ms (7% of total)

Main Thread Breakdown

Style & Layout 63% Script Evaluation 16% Other 14% Rendering 4%

Script	Total	Scripting	Parse/Compile	Party
https://www.mossandmolt.com/	3399ms	273ms	25ms	1st
Unattributable	304ms	21ms	0ms	1st
https://www.mossandmolt.com/cdn/wpm/bf882002ew93f4c027p0c16e2cama50b1ec1m.js	246ms	127ms	8ms	1st
https://www.mossandmolt.com/cdn/shop/t/18/assets/mm-shrimp-bar.js?v=120813251631150360881793383007	170ms	18ms	0ms	1st
https://cdn.shopify.com/extensions/01a1c05e-97bc-7b92-a0a6-bbd3ac7cef55/judgeme-850/assets/loader.js	167ms	88ms	0ms	3rd
https://www.mossandmolt.com/cdn/shop/t/18/assets/mm-oct15-nav.js?v=65700980751981609241793391424	124ms	11ms	0ms	1st
https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.register_f-gtu_uJ.esm.js	80ms	32ms	0ms	3rd
https://cdn.shopify.com/storefront/web-components/account.js	53ms	10ms	0ms	3rd

Page Weight Inventory

Action

411 resources · 4.2 MB · 39 KB savings available

REVIEW

411 resources · 4.2 MB · 39 KB savings available

Page weight 4.2 MB exceeds 1 MB target by 3.2 MB

Got: 4.2 MB Expected: ≤ 1 MB

192 third-party resources (21% of weight)

2 resources over 200KB

411 resources · 4.2 MiB · 192 third-party 3.2 MiB over 1MB target

Image 52% · 2.2 MiB

JavaScript 34% · 1.4 MiB

Document 7% · 288.6 KiB

Font 4% · 179.4 KiB

CSS 2% · 91.3 KiB

Other 1% · 25.9 KiB

~38.7 KiB of savings available

Remove unused JavaScript: 38.7 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

411 resources			4.2 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 (893.8 KiB of 4.2 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.

A+

Image Optimization

62 images, 0 KB saveable

PASS

62 images, 0 KB saveable

All images are well-optimized

62 images 2.2 MB

0 oversized -0 KB

1 legacy format

0 missing dimensions CLS risk

A+

Font Loading

6 fonts (179 KB)

PASS

6 fonts (179 KB)

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

Web fonts

179 KB total

Render-blocking

of 6

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 46 ms

Start 267 ms