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.

726 ms

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

1.65 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.

0.030

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.

2.13 s

Page Load Progression

935 ms

1.9 s

2.8 s

3.7 s

4.7 s

5.6 s

6.5 s

7.5 s

Checks

16 PASS 2 REVIEW 2 FIX

Page Weight Budget

Action

4.0 MB transferred, 439 requests

FIX

4.0 MB transferred, 439 requests

Page weighs 6.0 MB (4.0 MB transferred)

Images are 1.9 MB — compress or use modern formats

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

Got: 1.9 MB

JavaScript is 655 KB — consider code splitting or lazy loading

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

Got: 655 KB

439 HTTP requests — consider bundling or reducing

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

Estimated 0.84 g CO2 per page load

4.0 MB transferred

439 requests

0.84 g CO2 per page load

Images 1.9 MiB 48%

Other 935.2 KiB 23%

JavaScript 655.0 KiB 16%

HTML 261.4 KiB 6%

Fonts 141.6 KiB 3%

Other 58.9 KiB 1%

CSS 49.9 KiB 1%

Other 37.4 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

4539ms total JS execution

FIX

4539ms total JS execution

https://www.mossandmolt.com/: 3457ms CPU time

Unattributable: 335ms CPU time

https://www.mossandmolt.com/cdn/wpm/b610a19cewf693...: 228ms CPU time

https://www.mossandmolt.com/cdn/shop/t/18/assets/m...: 190ms CPU time

https://cdn.shopify.com/extensions/01a19f7d-4422-7...: 173ms CPU time

Third-party scripts: 223ms (5% of total)

Main Thread Breakdown

Style & Layout 63% Other 16% Script Evaluation 14% Rendering 5%

Script	Total	Scripting	Parse/Compile	Party
https://www.mossandmolt.com/	3457ms	207ms	35ms	1st
Unattributable	335ms	27ms	0ms	1st
https://www.mossandmolt.com/cdn/wpm/b610a19cewf693d529pf324840bm6169d9b4m.js	228ms	111ms	6ms	1st
https://www.mossandmolt.com/cdn/shop/t/18/assets/mm-shrimp-bar.js?v=120813251631150360881793383007	190ms	19ms	0ms	1st
https://cdn.shopify.com/extensions/01a19f7d-4422-7e9b-a1a4-bde5bbe4ede9/judgeme-843/assets/loader.js	173ms	79ms	0ms	3rd
https://www.mossandmolt.com/cdn/shop/t/18/assets/mm-oct15-nav.js?v=65700980751981609241793391424	106ms	9ms	0ms	1st
https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.register_oML0Hu4L.esm.js	50ms	29ms	0ms	3rd

Page Weight Inventory

Action

439 resources · 4.0 MB · 38 KB savings available

REVIEW

439 resources · 4.0 MB · 38 KB savings available

Page weight 4.0 MB exceeds 1 MB target by 3.0 MB

Got: 4.0 MB Expected: ≤ 1 MB

189 third-party resources (19% of weight)

1 resources over 200KB

439 resources · 4.0 MiB · 189 third-party 3.0 MiB over 1MB target

Image 48% · 1.9 MiB

JavaScript 40% · 1.6 MiB

Document 7% · 279.9 KiB

Font 3% · 141.6 KiB

CSS 1% · 55.9 KiB

Other 1% · 24.0 KiB

~37.7 KiB of savings available

Remove unused JavaScript: 37.7 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

439 resources			4.0 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

A+

Third-Party Impact

19% third-party, 0 ms blocking

PASS

19% third-party, 0 ms blocking

Third-party code accounts for 19% of page weight (785.0 KiB of 4.0 MiB)

Third-party blocking time is low (0 ms)

81%

19%

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

54 images, 0 KB saveable

PASS

54 images, 0 KB saveable

All images are well-optimized

54 images 1.9 MB

0 oversized -0 KB

1 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 30 ms

Start 176 ms