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.

663 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.

0 ms

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

0.039

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

1.60 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.

1.05 s

Page Load Progression

911 ms

1.8 s

2.7 s

3.6 s

4.6 s

5.5 s

6.4 s

7.3 s

Checks

15 PASS 2 REVIEW 3 FIX

Page Weight Budget

Action

4.3 MB transferred, 420 requests

FIX

4.3 MB transferred, 420 requests

Page weighs 6.4 MB (4.3 MB transferred)

Images are 1.6 MB — compress or use modern formats

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

Got: 1.6 MB

JavaScript is 642 KB — consider code splitting or lazy loading

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

Got: 642 KB

420 HTTP requests — consider bundling or reducing

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

Estimated 0.89 g CO2 per page load

4.3 MB transferred

420 requests

0.89 g CO2 per page load

Images 1.6 MiB 37%

Other 831.4 KiB 19%

JavaScript 642.1 KiB 15%

Other 618.8 KiB 14%

HTML 182.6 KiB 4%

Fonts 141.1 KiB 3%

Other 131.7 KiB 3%

CSS 118.5 KiB 3%

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

3983ms total JS execution

FIX

3983ms total JS execution

https://www.mossandmolt.com/: 3055ms CPU time

Unattributable: 337ms CPU time

https://www.mossandmolt.com/cdn/shop/t/18/assets/m...: 171ms CPU time

https://www.mossandmolt.com/cdn/wpm/ba415808dw2c13...: 167ms CPU time

https://cdn.shopify.com/extensions/01a1ca44-d4c2-7...: 154ms CPU time

Third-party scripts: 154ms (4% of total)

Main Thread Breakdown

Style & Layout 60% Script Evaluation 17% Other 16% Rendering 4%

Script	Total	Scripting	Parse/Compile	Party
https://www.mossandmolt.com/	3055ms	258ms	28ms	1st
Unattributable	337ms	26ms	0ms	1st
https://www.mossandmolt.com/cdn/shop/t/18/assets/mm-amz-info.js?v=96361204987043249471794334097	171ms	23ms	0ms	1st
https://www.mossandmolt.com/cdn/wpm/ba415808dw2c139137pa995880fm244b3dcfm.js	167ms	99ms	5ms	1st
https://cdn.shopify.com/extensions/01a1ca44-d4c2-734d-9bb5-8ebb3734d98b/judgeme-856/assets/loader.js	154ms	84ms	0ms	3rd
https://www.mossandmolt.com/cdn/shop/t/18/assets/mm-oct15-nav.js?v=136258265581687000371794435476	99ms	8ms	0ms	1st

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.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

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

420 resources · 4.3 MB · 39 KB savings available

REVIEW

420 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

198 third-party resources (36% of weight)

3 resources over 200KB

420 resources · 4.3 MiB · 198 third-party 3.3 MiB over 1MB target

Image 38% · 1.6 MiB

JavaScript 35% · 1.5 MiB

Media 14% · 618.8 KiB

Document 7% · 286.6 KiB

Font 3% · 141.1 KiB

CSS 3% · 124.5 KiB

Other 1% · 31.6 KiB

~39.2 KiB of savings available

Remove unused JavaScript: 39.2 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

420 resources			4.3 MiB

Third-Party Impact

36% third-party, 0 ms blocking

PASS

36% third-party, 0 ms blocking

Third-party code accounts for 36% of page weight (1.5 MiB of 4.3 MiB)

Third-party blocking time is low (0 ms)

64%

36%

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

59 images, 0 KB saveable

PASS

59 images, 0 KB saveable

All images are well-optimized

59 images 1.6 MB

0 oversized -0 KB

0 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 28 KB

Load time 40 ms

Start 771 ms