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https://glossier.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
23
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
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.

4.01 s

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

6.06 s

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

3.39 s

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

0.196

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

9.12 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.

34.76 s

Page Load Progression

1.3 s
2.5 s
3.8 s
5.0 s
6.3 s
7.5 s
8.8 s
10.0 s
Checks
16
8 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
5.4 MB transferred, 354 requests
FIX
5.4 MB transferred, 354 requests
Critical::
Page weighs 12.0 MB (5.4 MB transferred)
Warning::
JavaScript is 3.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.0 MB
Warning::
354 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.1 g CO2 per page load
5.4 MB / 2.4 MB budget
5.4 MB transferred
354 requests
1.1 g CO2 per page load
JavaScript 3.0 MiB 57%
Other 1.2 MiB 23%
Images 645.5 KiB 12%
HTML 160.8 KiB 3%
Fonts 133.7 KiB 2%
Other 75.2 KiB 1%
Other 56.9 KiB 1%
CSS 49.9 KiB 1%
Other 18.0 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (5.4 MiB of 5.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
16865ms total JS execution
FIX
16865ms total JS execution
Warning::
Unattributable: 2429ms CPU time
Warning::
https://www.glossier.com/cdn/wpm/b0e8c7c7aw41bd75a...: 2173ms CPU time
Warning::
https://www.glossier.com/en-es: 2058ms CPU time
Warning::
https://edge.fullstory.com/s/fs.js: 1431ms CPU time
Warning::
https://cdn.optimizely.com/js/22916101539.js: 1249ms CPU time
Warning::
Third-party scripts: 16865ms (100% of total)

Main Thread Breakdown

Script Evaluation 58% Other 19% Style & Layout 13% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
Unattributable2429ms348ms0ms3rd
https://www.glossier.com/cdn/wpm/b0e8c7c7aw41bd75a1p837d7fd4m8b145375m.js2173ms1512ms18ms3rd
https://www.glossier.com/en-es2058ms212ms22ms3rd
https://edge.fullstory.com/s/fs.js1431ms920ms24ms3rd
https://cdn.optimizely.com/js/22916101539.js1249ms916ms42ms3rd
https://www.glossier.com/cdn/shop/t/1393/assets/app.min.js?v=116494217122873023101774881013947ms395ms92ms3rd
https://21bd15724800.cdn4.forter.com/sn/21bd15724800/script.js653ms533ms55ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KW9HP9Z644ms565ms64ms3rd
https://onsite.joinground.com/ground.js633ms581ms25ms3rd
https://7ce243a1e1a2.cdn4.forter.com/sn/7ce243a1e1a2/script.js451ms402ms38ms3rd

Showing top 10 of 32 scripts

F
JS Bundles
Action
189 scripts, 1.0 MB unused
FIX
189 scripts, 1.0 MB unused
Warning::
https://7ce243a1e1a2.cdn4.forter.com/sn/7ce243a1e1...: 92 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://21bd15724800.cdn4.forter.com/sn/21bd157248...: 88 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://21bd15724800.cdn4.forter.com/sn/21bd157248...: 88 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.rechargecdn.com/assets/js/widget.mi...: 75 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-J11M...: 67 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.0 MB
1052 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://7ce243a1e1a2.cdn4.forter.com/sn/7ce243a1e1a2/script.js220 KB92 KB (42%)✓3rd
https://21bd15724800.cdn4.forter.com/sn/21bd15724800/script.js215 KB88 KB (41%)✓3rd
https://21bd15724800.cdn4.forter.com/sn/21bd15724800/script.js215 KB88 KB (41%)✓3rd
https://static.rechargecdn.com/assets/js/widget.min.js?shop=glossier-admin.myshopify.com119 KB75 KB (63%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-J11MBLGD5V&cx=c&gtm=4e6461169 KB67 KB (40%)✓3rd
https://static.clairedefermat.com/pixel/v2/pixel.js70 KB58 KB (84%)✓3rd
https://www.glossier.com/cdn/shop/t/1393/assets/app.min.js?v=11649421712287302310177488101384 KB55 KB (65%)✓3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMw.js110 KB54 KB (49%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KW9HP9Z173 KB53 KB (31%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-960173363&cx=c&gtm=4e6461144 KB52 KB (36%)✓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

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, no-store

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-store—Never cache this response
C
Image Optimization
Action
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://glossier-prod.imgix.net/files/glossier-soi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://glossier-prod.imgix.net/files/glossier-soi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.glossier.com/cdn/shop/t/1393/assets/se... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://glossier-prod.imgix.net/files/glossier-soi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://glossier-prod.imgix.net/files/glossier-soi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 646 KB
0 oversized -0 KB
10 legacy format
6 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

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

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

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

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

Source: web.dev / Core Web Vitals

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
10 fonts (167 KB)
PASS
10 fonts (167 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

167 KB total

Render-blocking

0

of 10

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 FCP 4.0 s LCP 6.1 shttps://www.glossier.com/cdn/shop/t/1393/assets/Apercu.woff?v=27749520405110232131774881013Apercu.woff https://www.glossier.com/cdn/shop/t/1393/assets/Apercu.woff?v=27749520405110232131774881013 — 16.7 KiB — 0 ms — font-display: swaphttps://www.glossier.com/cdn/shop/t/1393/assets/Apercu-MediumItalic.woff?v=166049247236756587401774881013Apercu-MediumItalic.woff https://www.glossier.com/cdn/shop/t/1393/assets/Apercu-MediumItalic.woff?v=166049247236756587401774881013 — 18.0 KiB — 0 ms — font-display: swaphttps://www.glossier.com/cdn/shop/t/1393/assets/Apercu-Bold.woff?v=77441056927343755651774881013Apercu-Bold.woff https://www.glossier.com/cdn/shop/t/1393/assets/Apercu-Bold.woff?v=77441056927343755651774881013 — 16.5 KiB — 0 ms — font-display: swaphttps://www.glossier.com/cdn/shop/t/1393/assets/Apercu-Medium.woff?v=135256279722417433531774881013Apercu-Medium.woff https://www.glossier.com/cdn/shop/t/1393/assets/Apercu-Medium.woff?v=135256279722417433531774881013 — 16.8 KiB — 0 ms — font-display: swaphttps://www.glossier.com/cdn/shop/t/1393/assets/Apercu-Italic.woff?v=167501330633256636311774881013Apercu-Italic.woff https://www.glossier.com/cdn/shop/t/1393/assets/Apercu-Italic.woff?v=167501330633256636311774881013 — 18.4 KiB — 0 ms — font-display: swaphttps://www.glossier.com/cdn/shop/t/1393/assets/Apercu-Mono.woff?v=95926578357820724491774881013Apercu-Mono.woff https://www.glossier.com/cdn/shop/t/1393/assets/Apercu-Mono.woff?v=95926578357820724491774881013 — 11.8 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/0627/9164/7477/files/font-apercupro-regular.woff2?v=1652966868font-apercupro-regular.... https://cdn.shopify.com/s/files/1/0627/9164/7477/files/font-apercupro-regular.woff2?v=1652966868 — 17.8 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/0627/9164/7477/files/font-apercupro-medium.woff2?v=1679586878font-apercupro-medium.w... https://cdn.shopify.com/s/files/1/0627/9164/7477/files/font-apercupro-medium.woff2?v=1679586878 — 17.7 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/0627/9164/7477/files/Apercu.woff2?v=1721062709Apercu.woff2 https://cdn.shopify.com/s/files/1/0627/9164/7477/files/Apercu.woff2?v=1721062709 — 16.7 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/0627/9164/7477/files/Apercu-Bold.woff2?v=1721062709Apercu-Bold.woff2 https://cdn.shopify.com/s/files/1/0627/9164/7477/files/Apercu-Bold.woff2?v=1721062709 — 16.4 KiB — 0 ms — font-display: swap
Apercu.woff woff swap
Size 17 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Apercu-MediumItalic.woff woff swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Apercu-Bold.woff woff swap
Size 17 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Apercu-Medium.woff woff swap
Size 17 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Apercu-Italic.woff woff swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Apercu-Mono.woff woff swap
Size 12 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
font-apercupro-regular.... woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
font-apercupro-medium.w... woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Apercu.woff2 woff2 swap
Size 17 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Apercu-Bold.woff2 woff2 swap
Size 16 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)

Fixing the unchecked items could save ~29 KB and ~58 ms

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
19 hints, 0 missing preconnects
PASS
19 hints, 0 missing preconnects
Info::
Page uses 19 resource hint(s)

Current Resource Hints

preconnect
6
preload
4
dns-prefetch
1
prefetch
8

19 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
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
354 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
100% of JavaScript execution is third-party
First-party Third-party 16865ms · 2234KB · €89/mo
Unattributable
Other
Costly
Execution 2429ms
Transfer 0 KB
Monthly Cost €13/mo
www.glossier.com
Other
Costly
Execution 2173ms
Transfer 61 KB
Unused 41%
Monthly Cost €12/mo
www.glossier.com
Other
Costly
Execution 2058ms
Transfer 57 KB
Monthly Cost €11/mo
edge.fullstory.com
Other
Costly
Execution 1431ms
Transfer 80 KB
Unused 33%
Monthly Cost €8/mo
Optimizely
A/B Testing
Costly
Execution 1249ms
Transfer 105 KB
Unused 31%
Monthly Cost €7/mo
www.glossier.com
Other
Costly
Execution 947ms
Transfer 84 KB
Unused 65%
Monthly Cost €5/mo
21bd15724800.cdn4.forter.com
Other
Costly
Execution 653ms
Transfer 215 KB
Unused 41%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 644ms
Transfer 173 KB
Unused 31%
Monthly Cost €3/mo
onsite.joinground.com
Other
Costly
Execution 633ms
Transfer 68 KB
Unused 51%
Monthly Cost €3/mo
7ce243a1e1a2.cdn4.forter.com
Other
Costly
Execution 451ms
Transfer 220 KB
Unused 42%
Monthly Cost €2/mo
(program):2
Other
Costly
Execution 420ms
Transfer 0 KB
Monthly Cost €2/mo
assets.gorgias.chat
Other
Costly
Execution 351ms
Transfer 93 KB
Unused 49%
Monthly Cost €2/mo
www.glossier.com
Other
Costly
Execution 349ms
Transfer 85 KB
Unused 57%
Monthly Cost €2/mo
www.glossier.com
Other
Costly
Execution 328ms
Transfer 4 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Costly
Execution 267ms
Transfer 169 KB
Unused 40%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Costly
Execution 256ms
Transfer 144 KB
Unused 36%
Monthly Cost €1/mo
www.glossier.com
Other
Costly
Execution 253ms
Transfer 31 KB
Monthly Cost €1/mo
us-assets.i.posthog.com
Other
Costly
Execution 241ms
Transfer 65 KB
Unused 51%
Monthly Cost €1/mo
analytics.tiktok.com
Other
Costly
Execution 240ms
Transfer 110 KB
Unused 49%
Monthly Cost €1/mo
static.rechargecdn.com
Other
Optional
Execution 182ms
Transfer 119 KB
Unused 63%
Monthly Cost €1/mo
www.glossier.com
Other
Optional
Execution 150ms
Transfer 21 KB
Monthly Cost €1/mo
static.klaviyo.com
Other
Optional
Execution 143ms
Transfer 8 KB
Monthly Cost €1/mo
assets.gorgias.chat
Other
Optional
Execution 139ms
Transfer 38 KB
Unused 67%
Monthly Cost €1/mo
static.klaviyo.com
Other
Optional
Execution 136ms
Transfer 52 KB
Unused 81%
Monthly Cost €1/mo
static.klaviyo.com
Other
Optional
Execution 123ms
Transfer 11 KB
Monthly Cost €1/mo
d.impactradius-event.com
Other
Optional
Execution 112ms
Transfer 26 KB
Monthly Cost €1/mo
www.glossier.com
Other
Optional
Execution 100ms
Transfer 28 KB
Monthly Cost €1/mo
www.glossier.com
Other
Optional
Execution 98ms
Transfer 23 KB
Monthly Cost €1/mo
sc-static.net
Other
Optional
Execution 91ms
Transfer 25 KB
Monthly Cost €0/mo
crossborder-integration.global-e.com
Other
Optional
Execution 76ms
Transfer 23 KB
Monthly Cost €0/mo
static.clairedefermat.com
Other
Optional
Execution 73ms
Transfer 70 KB
Unused 84%
Monthly Cost €0/mo
www.glossier.com
Other
Optional
Execution 71ms
Transfer 26 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 2429ms and costs ~€13/month
  • www.glossier.com adds 2173ms and costs ~€12/month
  • www.glossier.com adds 2058ms and costs ~€11/month
  • edge.fullstory.com adds 1431ms and costs ~€8/month
  • Optimizely adds 1249ms and costs ~€7/month
  • www.glossier.com adds 947ms and costs ~€5/month
  • 21bd15724800.cdn4.forter.com adds 653ms and costs ~€3/month
  • Google Tag Manager adds 644ms and costs ~€3/month
  • onsite.joinground.com adds 633ms and costs ~€3/month
  • 7ce243a1e1a2.cdn4.forter.com adds 451ms and costs ~€2/month
  • (program):2 adds 420ms and costs ~€2/month
  • assets.gorgias.chat adds 351ms and costs ~€2/month
  • www.glossier.com adds 349ms and costs ~€2/month
  • www.glossier.com adds 328ms and costs ~€2/month
  • Google Tag Manager adds 267ms and costs ~€1/month
  • Google Tag Manager adds 256ms and costs ~€1/month
  • www.glossier.com adds 253ms and costs ~€1/month
  • us-assets.i.posthog.com adds 241ms and costs ~€1/month
  • analytics.tiktok.com adds 240ms and costs ~€1/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

Unattributable takes 2429ms 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

www.glossier.com takes 2173ms 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

www.glossier.com takes 2058ms 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

edge.fullstory.com takes 1431ms 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

Optimizely takes 1249ms 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

www.glossier.com takes 947ms 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

65% of www.glossier.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

21bd15724800.cdn4.forter.com takes 653ms 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

Google Tag Manager takes 644ms 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

onsite.joinground.com takes 633ms 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

51% of onsite.joinground.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

7ce243a1e1a2.cdn4.forter.com takes 451ms 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

(program):2 takes 420ms 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

assets.gorgias.chat takes 351ms 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

www.glossier.com takes 349ms 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

57% of www.glossier.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

www.glossier.com takes 328ms 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

Google Tag Manager takes 267ms 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

Google Tag Manager takes 256ms 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

www.glossier.com takes 253ms 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

us-assets.i.posthog.com takes 241ms 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

51% of us-assets.i.posthog.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

analytics.tiktok.com takes 240ms 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

63% of static.rechargecdn.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

67% of assets.gorgias.chat'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

81% of static.klaviyo.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

84% of static.clairedefermat.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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