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https://jeffreestarcosmetics.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
2
PASS
6
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
62
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

451 ms

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

6.87 s

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

130 ms

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

0.085

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

5.17 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.

9.93 s

Page Load Progression

1.4 s
2.7 s
4.1 s
5.4 s
6.8 s
8.1 s
9.5 s
10.8 s
Checks
14
6 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
17.2 MB transferred, 420 requests
FIX
17.2 MB transferred, 420 requests
Critical::
Page weighs 23.7 MB (17.2 MB transferred)
Warning::
Images are 13.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 13.1 MB
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Info::
Fonts are 247 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 247 KB
Warning::
420 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 3.6 g CO2 per page load
17.2 MB / 2.4 MB budget
17.2 MB transferred
420 requests
3.6 g CO2 per page load
Images 13.1 MiB 76%
JavaScript 2.4 MiB 14%
Other 1.2 MiB 7%
Fonts 246.8 KiB 1%
HTML 153.6 KiB 1%
CSS 126.5 KiB 1%
Other 31.6 KiB 0%
Other 11.1 KiB 0%
Other 9.9 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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

F
JS Execution Cost
Action
5486ms total JS execution
FIX
5486ms total JS execution
Warning::
https://jeffreestarcosmetics.com/: 3375ms CPU time
Warning::
Unattributable: 943ms CPU time
Info::
https://jeffreestarcosmetics.com/cdn/wpm/b0e8c7c7a...: 161ms CPU time
Info::
https://assets.gorgias.chat/build/static/js/279.6b...: 155ms CPU time
Info::
https://jeffreestarcosmetics.com/cdn/shopifycloud/...: 142ms CPU time
Info::
Third-party scripts: 1596ms (29% of total)

Main Thread Breakdown

Other 45% Script Evaluation 23% Style & Layout 17% Rendering 9% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://jeffreestarcosmetics.com/3375ms54ms5ms1st
Unattributable943ms26ms0ms3rd
https://jeffreestarcosmetics.com/cdn/wpm/b0e8c7c7aw41bd75a1p837d7fd4m8b145375m.js161ms97ms6ms1st
https://assets.gorgias.chat/build/static/js/279.6ba6eb825556cdb4.js155ms123ms5ms3rd
https://jeffreestarcosmetics.com/cdn/shopifycloud/storefront/assets/shop_events_listener-3da45d37.js142ms116ms0ms1st
https://jeffreestarcosmetics.com/cdn/shopifycloud/shop-js/modules/v2/chunk.index_4uAqGWkW.en.esm.js128ms13ms0ms1st
https://static.klaviyo.com/onsite/js/build-preview/commit-98747c9b1816a2f78e748cdc073a286a0296d9f7/vendors~in_app_forms~signup_forms~reviews~atlas.0201e888d834a3782e3a.js?cb=2118ms69ms0ms3rd
https://jeffreestarcosmetics.com/cdn/shop/t/245/assets/app.min.js?v=13335726632841062026176977716883ms34ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-81RXDPTBJQ79ms58ms20ms3rd
https://static.klaviyo.com/onsite/js/build-preview/commit-98747c9b1816a2f78e748cdc073a286a0296d9f7/1011.fa12d00c7a08724d2839.js71ms61ms0ms3rd

Showing top 10 of 14 scripts

F
JS Bundles
Action
163 scripts, 936 KB unused
FIX
163 scripts, 936 KB unused
Warning::
https://cdn.rebuyengine.com/onsite/js/global.js?bu...: 166 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn-swell-assets.yotpo.com/app.v1.0.368.js: 130 KB unused (86%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://dawtemplatesmaster.com/_shopify_app_ressou...: 78 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://dawtemplatesmaster.com/_shopify_app_ressou...: unminified — 46 KB could be saved
Warning::
https://www.googletagmanager.com/gtag/destination?...: 64 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-81RX...: 63 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 936 KB
936 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.rebuyengine.com/onsite/js/global.js?build=1775594982221 KB166 KB (75%)✓3rd
https://cdn-swell-assets.yotpo.com/app.v1.0.368.js192 KB130 KB (86%)✓3rd
https://dawtemplatesmaster.com/_shopify_app_ressources/osaria_sap_v2/mediaelement-osaria.js?shop=jeffree-star-cosmetics.myshopify.com90 KB78 KB (88%)✗3rd
https://www.googletagmanager.com/gtag/destination?id=MC-0MGTFZ50PE&cx=c&gtm=4e6461136 KB64 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-81RXDPTBJQ164 KB63 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-325015524&cx=c&gtm=4e6461144 KB59 KB (41%)✓3rd
https://cdn.506.io/eg/script.js?shop=jeffree-star-cosmetics.myshopify.com&v=978 KB57 KB (74%)✓3rd
https://gdprcdn.b-cdn.net/js/components.consentmo.js50 KB45 KB (93%)✓3rd
https://assets.gorgias.chat/build/static/js/279.6ba6eb825556cdb4.js93 KB41 KB (45%)✓3rd
https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-98747c9b1816a2f78e748cdc073a286a0296d9f7/Render.f778b94f6021eec68929.js52 KB35 KB (68%)✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.
Info::
ETag present — enables conditional (304) responses

No Cache-Control header

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

B
Third-Party Impact
40% third-party, 0 ms blocking
REVIEW
40% third-party, 0 ms blocking
Info::
Third-party code accounts for 40% of page weight (6.9 MiB of 17.2 MiB)
Info::
Third-party blocking time is low (0 ms)
60%
40%
First-party Third-party
B
Image Optimization
140 images, 0 KB saveable
REVIEW
140 images, 0 KB saveable
Info::
All images are well-optimized
140 images 13.1 MB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
12 fonts (247 KB)
PASS
12 fonts (247 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

247 KB total

Render-blocking

0

of 12

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 451 ms LCP 6.9 shttps://jeffreestarcosmetics.com/cdn/shop/t/245/assets/font-nohemi-regular.woff2?v=110191566278659115261719510354font-nohemi-regular.woff2 https://jeffreestarcosmetics.com/cdn/shop/t/245/assets/font-nohemi-regular.woff2?v=110191566278659115261719510354 — 21.8 KiB — 0 ms — font-display: swaphttps://jeffreestarcosmetics.com/cdn/shop/t/245/assets/font-din-condensed-light.woff2?v=85322731573101176081719510354font-din-condensed-ligh... https://jeffreestarcosmetics.com/cdn/shop/t/245/assets/font-din-condensed-light.woff2?v=85322731573101176081719510354 — 10.4 KiB — 0 ms — font-display: swaphttps://jeffreestarcosmetics.com/cdn/shop/t/245/assets/font-gt-alpina-fine-condensed-light.woff2?v=19042904983340866491719510355font-gt-alpina-fine-con... https://jeffreestarcosmetics.com/cdn/shop/t/245/assets/font-gt-alpina-fine-condensed-light.woff2?v=19042904983340866491719510355 — 12.7 KiB — 0 ms — font-display: swaphttps://jeffreestarcosmetics.com/cdn/shop/t/245/assets/font-nohemi-medium.woff2?v=152191782221796558911719510354font-nohemi-medium.woff2 https://jeffreestarcosmetics.com/cdn/shop/t/245/assets/font-nohemi-medium.woff2?v=152191782221796558911719510354 — 22.4 KiB — 0 ms — font-display: swaphttps://jeffreestarcosmetics.com/cdn/shop/t/245/assets/font-nohemi-light.woff2?v=86175879362497025441719510355font-nohemi-light.woff2 https://jeffreestarcosmetics.com/cdn/shop/t/245/assets/font-nohemi-light.woff2?v=86175879362497025441719510355 — 22.8 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/shop-assets/static_uploads/shoplift/GTStandard-MRegular.woff2GTStandard-MRegular.woff2 https://cdn.shopify.com/shop-assets/static_uploads/shoplift/GTStandard-MRegular.woff2 — 63.2 KiB — 0 ms — font-display: swaphttps://jeffreestarcosmetics.com/cdn/shop/t/245/assets/font-nohemi-bold.woff2?v=75447495459913113161719510355font-nohemi-bold.woff2 https://jeffreestarcosmetics.com/cdn/shop/t/245/assets/font-nohemi-bold.woff2?v=75447495459913113161719510355 — 22.3 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 0 B — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2pxiEyp8kv8JHgFVrJJfecnF... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 7.7 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/bebasneue/v16/JTUSjIg69CK48gW7PXoo9WlhyyTh89Y.woff2JTUSjIg69CK48gW7PXoo9Wl... https://fonts.gstatic.com/s/bebasneue/v16/JTUSjIg69CK48gW7PXoo9WlhyyTh89Y.woff2 — 8.4 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLCz7Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 7.7 KiB — 0 ms — font-display: swap
font-nohemi-regular.woff2 woff2 swap
Size 22 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
font-din-condensed-ligh... woff2 swap
Size 10 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
font-gt-alpina-fine-con... woff2 swap
Size 13 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
font-nohemi-medium.woff2 woff2 swap
Size 22 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
font-nohemi-light.woff2 woff2 swap
Size 23 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GTStandard-MRegular.woff2 woff2 swap
Size 63 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
font-nohemi-bold.woff2 woff2 swap
Size 22 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
pxiEyp8kv8JHgFVrJJfecnF... woff2 swap
Size 8 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
JTUSjIg69CK48gW7PXoo9Wl... woff2 swap
Size 8 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLCz7Z1x... woff2 swap
Size 8 KB
Load time 0 ms
Start 0 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+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
420 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
29% of JavaScript execution is third-party
First-party Third-party 1596ms · 898KB · €8/mo
Unattributable
Other
Costly
Execution 943ms
Transfer 0 KB
Monthly Cost €5/mo
assets.gorgias.chat
Other
Optional
Execution 155ms
Transfer 93 KB
Unused 45%
Monthly Cost €1/mo
static.klaviyo.com
Other
Optional
Execution 118ms
Transfer 10 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 79ms
Transfer 164 KB
Unused 38%
Monthly Cost €0/mo
static.klaviyo.com
Other
Optional
Execution 71ms
Transfer 8 KB
Monthly Cost €0/mo
gdprcdn.b-cdn.net
Other
Optional
Execution 64ms
Transfer 65 KB
Unused 54%
Monthly Cost €0/mo
cdn.rebuyengine.com
Other
Optional
Execution 62ms
Transfer 221 KB
Unused 75%
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 53ms
Transfer 144 KB
Unused 41%
Monthly Cost €0/mo
cdn-swell-assets.yotpo.com
Other
Optional
Execution 50ms
Transfer 192 KB
Unused 86%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 943ms and costs ~€5/month

Unattributable takes 943ms 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

54% of gdprcdn.b-cdn.net's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

75% of cdn.rebuyengine.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

86% of cdn-swell-assets.yotpo.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

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

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