Performance

· 22 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

100

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.

402 ms

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

402 ms

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.

0.000

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

787 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

402 ms

Page Load Progression

395 ms

790 ms

1.2 s

1.6 s

2.0 s

2.4 s

2.8 s

3.2 s

Checks

10 PASS 4 REVIEW 4 FIX

Page Weight Budget

Action

21.6 MB transferred, 104 requests

FIX

21.6 MB transferred, 104 requests

Page weighs 25.1 MB (21.6 MB transferred)

Images are 5.2 MB — compress or use modern formats

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

Got: 5.2 MB

JavaScript is 771 KB — consider code splitting or lazy loading

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

Got: 771 KB

104 HTTP requests — consider bundling or reducing

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

Estimated 4.5 g CO2 per page load

21.6 MB transferred

104 requests

4.5 g CO2 per page load

Other 15.4 MiB 71%

Images 5.2 MiB 24%

JavaScript 770.8 KiB 3%

CSS 114.6 KiB 1%

HTML 111.7 KiB 1%

Fonts 40.0 KiB 0%

Other 1.3 KiB 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

Third-Party Impact

Action

74% third-party, 0 ms blocking

FIX

74% third-party, 0 ms blocking

Third-party code accounts for 74% of page weight (16.0 MiB of 21.6 MiB)

Third-party blocking time is low (0 ms)

26%

74%

First-party Third-party

Page Weight Inventory

Action

104 resources · 21.6 MB · 0 KB savings available

FIX

104 resources · 21.6 MB · 0 KB savings available

Page weight 21.6 MB exceeds 1 MB target by 20.6 MB

Got: 21.6 MB Expected: ≤ 1 MB

44 third-party resources (74% of weight)

15 resources over 200KB

104 resources · 21.6 MiB · 44 third-party 20.6 MiB over 1MB target

Media 71% · 15.4 MiB

Image 24% · 5.2 MiB

JavaScript 3% · 770.8 KiB

CSS 1% · 114.6 KiB

Document 1% · 111.7 KiB

Font 0% · 40.0 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

104 resources			21.6 MiB

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.

ETag present — enables conditional (304) responses

No Cache-Control header

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

JS Execution Cost

785ms total JS execution

REVIEW

785ms total JS execution

Unattributable: 393ms CPU time

https://sensitivestones.com/: 392ms CPU time

Third-party scripts: 393ms (50% of total)

Main Thread Breakdown

Other 62% Style & Layout 27% Rendering 4% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	393ms	3ms	0ms	3rd
https://sensitivestones.com/	392ms	19ms	0ms	1st

Compression Algorithm

Action

Main response served uncompressed

REVIEW

Main response served uncompressed

Main HTML response has no Content-Encoding (uncompressed)

The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.

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.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

Image Optimization

33 images, 0 KB saveable

PASS

33 images, 0 KB saveable

https://cdn.shopify.com/s/files/1/0627/6300/8088/f... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

33 images 5.2 MB

0 oversized -0 KB

1 legacy format

2 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A+

Font Loading

3 fonts (40 KB)

PASS

3 fonts (40 KB)

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

Web fonts

40 KB total

Render-blocking

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

jost_n5.7c8497861ffd15f... woff2 swap

Size 14 KB

Load time 71 ms

Start 142 ms

Risk FOUT — text flashes from fallback to web font

jost_n7.921dc18c13fa0b0... woff2 swap

Size 14 KB

Load time 112 ms

Start 142 ms

Risk FOUT — text flashes from fallback to web font

jost_n4.d47a1b6347ce4a4... woff2 swap

Size 13 KB

Load time 58 ms

Start 453 ms

Risk FOUT — text flashes from fallback to web font

Optimization checklist

Preload critical fonts (priority=high)
Use woff2 format for all fonts
Set font-display to swap, optional, or fallback
Subset large fonts (≤100 KB each)

A+

JS Bundles

37 scripts, 0 KB unused

PASS

37 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://sensitivestones.com/cdn/shop/t/49/assets/app.min.js?v=74502586755104031401771660434	38 KB	—	✓	1st
https://sensitivestones.com/cdn/shop/t/49/assets/foxkit-app.min.js?v=48166617155657649261771660476	15 KB	—	✓	1st
https://sensitivestones.com/cdn/shop/t/49/assets/lazy-image.min.js?v=164341435460352801361771660492	1 KB	—	✓	1st
https://githubfix.myshopify.com/cdn/shop/t/1/assets/asyncLoadG.js	2 KB	—	✓	3rd
https://loadspark.myshopify.com/cdn/shop/t/1/assets/network-1.0.0.js	4 KB	—	✓	3rd
https://quickstart-41d588e3.myshopify.com/cdn/shop/t/3/assets/viewsB.js	2 KB	—	✓	3rd
https://sensitivestones.com/cdn/shopifycloud/portable-wallets/latest/portable-wallets.en.js	75 KB	—	✓	1st
https://sensitivestones.com/cdn/shopifycloud/shop-js/modules/v2/loader.init-shop-cart-sync.en.esm.js	1 KB	—	✓	1st
https://sensitivestones.com/cdn/shop/t/49/assets/theme-global.aio.min.js?v=183163406347237672661771660560	3 KB	—	✓	1st
https://sensitivestones.com/cdn/shop/t/49/assets/product-form.min.js?v=68270388290648218341771660517	2 KB	—	✓	1st

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

HTTP/3 (QUIC)

HTTP/3 advertised via Alt-Svc

PASS

HTTP/3 advertised via Alt-Svc

HTTP/3 (QUIC) is supported

First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.

A+

LCP Image Preload

LCP preload audit not available

PASS

LCP preload audit not available

LCP image preload audit not available for this scan

A+

Server-Timing Observability

18 Server-Timing entries advertised

PASS

18 Server-Timing entries advertised

Server-Timing header advertises 18 timing entries

Network Waterfall

104 requests over 865ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

50% of JavaScript execution is third-party

First-party Third-party 393ms · 0KB · €2/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	393ms	0 KB	—	€2/mo	Costly

Unattributable

Other

Costly

Execution 393ms

Transfer 0 KB

Monthly Cost €2/mo

These scripts may cost more than they're worth

Unattributable adds 393ms and costs ~€2/month

50% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 393ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

Real-User Performance (CrUX)

Field metrics from the Chrome User Experience Report

INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-04-10 — 2026-05-07)

LCP (p75)

1460 ms

95% good

INP (p75)

267 ms

66% good

CLS (p75)

0.100

74% good

FCP (p75)

1467 ms

TTFB (p75)

887 ms

Image Optimization

72 images, 9803 KB total, 3924 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

9803 KB

Oversized

Wasted

3924 KB

8 missing alt text 53 missing dimensions 5 missing lazy loading

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.