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.

669 ms

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

1.05 s

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

20 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.

1.65 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.

4.91 s

Page Load Progression

1.3 s

2.6 s

3.8 s

5.1 s

6.4 s

7.7 s

8.9 s

10.2 s

Checks

16 PASS 2 REVIEW 2 FIX

Page Weight Budget

Action

4.3 MB transferred, 472 requests

FIX

4.3 MB transferred, 472 requests

Page weighs 6.2 MB (4.3 MB transferred)

Images are 2.1 MB — compress or use modern formats

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

Got: 2.1 MB

JavaScript is 650 KB — consider code splitting or lazy loading

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

Got: 650 KB

472 HTTP requests — consider bundling or reducing

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

Estimated 0.90 g CO2 per page load

4.3 MB transferred

472 requests

0.90 g CO2 per page load

Images 2.1 MiB 49%

Other 978.8 KiB 22%

JavaScript 649.9 KiB 15%

HTML 182.2 KiB 4%

Fonts 140.7 KiB 3%

Other 131.1 KiB 3%

CSS 99.9 KiB 2%

Other 58.9 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

6177ms total JS execution

FIX

6177ms total JS execution

https://www.mossandmolt.com/: 4847ms CPU time

Unattributable: 472ms CPU time

https://www.mossandmolt.com/cdn/shop/t/18/assets/m...: 289ms CPU time

https://cdn.shopify.com/extensions/01a1b026-3afe-7...: 193ms CPU time

https://www.mossandmolt.com/cdn/wpm/b43600932w1bbc...: 183ms CPU time

Third-party scripts: 261ms (4% of total)

Main Thread Breakdown

Style & Layout 62% Other 17% Script Evaluation 14% Rendering 5%

Script	Total	Scripting	Parse/Compile	Party
https://www.mossandmolt.com/	4847ms	276ms	35ms	1st
Unattributable	472ms	25ms	0ms	1st
https://www.mossandmolt.com/cdn/shop/t/18/assets/mm-shrimp-bar.js?v=120813251631150360881793383007	289ms	31ms	0ms	1st
https://cdn.shopify.com/extensions/01a1b026-3afe-7d47-9926-779602cea877/judgeme-849/assets/loader.js	193ms	99ms	0ms	3rd
https://www.mossandmolt.com/cdn/wpm/b43600932w1bbca933p2f8a9c65m024fd2f2m.js	183ms	135ms	8ms	1st
https://www.mossandmolt.com/cdn/shop/t/18/assets/mm-oct15-nav.js?v=65700980751981609241793391424	126ms	10ms	0ms	1st
https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.register_lK8tAztS.esm.js	68ms	42ms	0ms	3rd

Page Weight Inventory

Action

472 resources · 4.3 MB · 39 KB savings available

REVIEW

472 resources · 4.3 MB · 39 KB savings available

Page weight 4.3 MB exceeds 1 MB target by 3.3 MB

Got: 4.3 MB Expected: ≤ 1 MB

187 third-party resources (19% of weight)

2 resources over 200KB

472 resources · 4.3 MiB · 187 third-party 3.3 MiB over 1MB target

Image 49% · 2.1 MiB

JavaScript 38% · 1.6 MiB

Document 6% · 281.4 KiB

Font 3% · 140.7 KiB

CSS 2% · 105.9 KiB

Other 1% · 33.1 KiB

~38.7 KiB of savings available

Remove unused JavaScript: 38.7 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

472 resources			4.3 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 (841.1 KiB of 4.3 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

61 images, 0 KB saveable

PASS

61 images, 0 KB saveable

All images are well-optimized

61 images 2.1 MB

0 oversized -0 KB

1 legacy format

0 missing dimensions CLS risk

A+

Font Loading

5 fonts (141 KB)

PASS

5 fonts (141 KB)

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

Web fonts

141 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 34 ms

Start 725 ms