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https://www.glossier.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
65
GRADE
D
FIX
5
REVIEW
1
PASS
6
INFO
2

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

Mobile Desktop
19
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.
81
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.

6.52 s

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

17.19 s

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

7.18 s

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

0.156

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

11.05 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.

43.05 s

Page Load Progression

1.1 s
2.2 s
3.3 s
4.4 s
5.5 s
6.6 s
7.6 s
8.7 s
Checks
14
6 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
6.2 MB transferred, 413 requests
FIX
6.2 MB transferred, 413 requests
Critical::
Page weighs 15.2 MB (6.2 MB transferred)
Warning::
JavaScript is 3.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.7 MB
Warning::
413 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.3 g CO2 per page load
6.2 MB / 2.4 MB budget
6.2 MB transferred
413 requests
1.3 g CO2 per page load
JavaScript 3.7 MiB 59%
Other 1.2 MiB 20%
Images 651.9 KiB 10%
HTML 255.6 KiB 4%
Fonts 151.8 KiB 2%
Other 116.3 KiB 2%
Other 78.7 KiB 1%
CSS 49.8 KiB 1%
Other 21.7 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
71% third-party, 0 ms blocking
FIX
71% third-party, 0 ms blocking
Warning::
Third-party code accounts for 71% of page weight (4.4 MiB of 6.2 MiB)
Info::
Third-party blocking time is low (0 ms)
29%
71%
First-party Third-party
F
JS Execution Cost
Action
25037ms total JS execution
FIX
25037ms total JS execution
Warning::
Unattributable: 3027ms CPU time
Warning::
https://www.glossier.com/cdn/wpm/bcfa8229ew36b6053...: 2626ms CPU time
Warning::
https://www.glossier.com/cdn/shop/t/1393/assets/ap...: 1880ms CPU time
Warning::
https://edge.fullstory.com/s/fs.js: 1804ms CPU time
Warning::
https://www.glossier.com/: 1553ms CPU time
Warning::
Third-party scripts: 16043ms (64% of total)

Main Thread Breakdown

Script Evaluation 65% Other 17% Style & Layout 9% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
Unattributable3027ms616ms0ms3rd
https://www.glossier.com/cdn/wpm/bcfa8229ew36b6053dp1e134caame9d83f21m.js2626ms1932ms40ms1st
https://www.glossier.com/cdn/shop/t/1393/assets/app.min.js?v=1164942171228730231017748810131880ms585ms126ms1st
https://edge.fullstory.com/s/fs.js1804ms1377ms27ms3rd
https://www.glossier.com/1553ms470ms32ms1st
https://cdn.optimizely.com/js/22916101539.js1423ms1025ms47ms3rd
https://www.glossier.com/cdn/shop/t/1393/assets/index.min.js?v=1313063465820065470717748810131304ms953ms35ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-KW9HP9Z972ms887ms63ms3rd
https://onsite.joinground.com/ground.js868ms812ms36ms3rd
https://21bd15724800.cdn4.forter.com/sn/21bd15724800/script.js845ms729ms43ms3rd

Showing top 10 of 47 scripts

F
JS Bundles
Action
216 scripts, 1.2 MB unused
FIX
216 scripts, 1.2 MB unused
Warning::
https://7ce243a1e1a2.cdn4.forter.com/sn/7ce243a1e1...: 94 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://21bd15724800.cdn4.forter.com/sn/21bd157248...: 81 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://21bd15724800.cdn4.forter.com/sn/21bd157248...: 81 KB unused (42%)
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/destination?...: 67 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.2 MB
1272 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://7ce243a1e1a2.cdn4.forter.com/sn/7ce243a1e1a2/script.js221 KB94 KB (43%)✓3rd
https://21bd15724800.cdn4.forter.com/sn/21bd15724800/script.js213 KB81 KB (42%)✓3rd
https://21bd15724800.cdn4.forter.com/sn/21bd15724800/script.js213 KB81 KB (42%)✓3rd
https://static.rechargecdn.com/assets/js/widget.min.js?shop=glossier-admin.myshopify.com119 KB75 KB (63%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=G-J11MBLGD5V&cx=c&gtm=4e6411168 KB67 KB (40%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.js128 KB66 KB (51%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=MC-CKB65RMMGX&cx=c&gtm=4e6411135 KB64 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=GT-TBW8XFPT135 KB59 KB (44%)✓3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMw.js110 KB59 KB (54%)✓3rd
https://static.clairedefermat.com/pixel/v2/pixel.js70 KB58 KB (84%)✓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.

C
Image Optimization
Action
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
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::
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.
26 images 652 KB
0 oversized -0 KB
15 legacy format
6 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

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

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

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
11 fonts (185 KB)
PASS
11 fonts (185 KB)
Info::
11 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

11

185 KB total

Render-blocking

0

of 11

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s FCP 6.5 s LCP 17.2 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-Mono.woff?v=95926578357820724491774881013Apercu-Mono.woff https://www.glossier.com/cdn/shop/t/1393/assets/Apercu-Mono.woff?v=95926578357820724491774881013 — 11.7 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 — 18.3 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 — 17.2 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 — 18.3 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/0627/9164/7477/files/font-apercupro-medium.woff?v=1679586878font-apercupro-medium.woff https://cdn.shopify.com/s/files/1/0627/9164/7477/files/font-apercupro-medium.woff?v=1679586878 — 18.2 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 — 16.6 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 16 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-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
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
font-apercupro-regular.... woff2 swap
Size 17 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
font-apercupro-medium.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.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 ~35 KB and ~70 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
16 hints, 0 missing preconnects
PASS
16 hints, 0 missing preconnects
Info::
Page uses 16 resource hint(s)

Current Resource Hints

preconnect
3
preload
4
dns-prefetch
1
prefetch
8

16 resource hints configured

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
413 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
64% of JavaScript execution is third-party
First-party Third-party 16043ms · 2431KB · €85/mo
Unattributable
Other
Costly
Execution 3027ms
Transfer 0 KB
Monthly Cost €16/mo
edge.fullstory.com
Other
Costly
Execution 1804ms
Transfer 80 KB
Unused 32%
Monthly Cost €10/mo
Optimizely
A/B Testing
Costly
Execution 1423ms
Transfer 105 KB
Unused 30%
Monthly Cost €8/mo
Google Tag Manager
Tag Manager
Costly
Execution 972ms
Transfer 172 KB
Unused 31%
Monthly Cost €5/mo
onsite.joinground.com
Other
Costly
Execution 868ms
Transfer 64 KB
Monthly Cost €5/mo
21bd15724800.cdn4.forter.com
Other
Costly
Execution 845ms
Transfer 213 KB
Unused 42%
Monthly Cost €4/mo
7ce243a1e1a2.cdn4.forter.com
Other
Costly
Execution 737ms
Transfer 221 KB
Unused 43%
Monthly Cost €4/mo
(program):2
Other
Costly
Execution 692ms
Transfer 0 KB
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 630ms
Transfer 168 KB
Unused 40%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 475ms
Transfer 135 KB
Unused 44%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 448ms
Transfer 143 KB
Unused 35%
Monthly Cost €2/mo
static.klaviyo.com
Other
Costly
Execution 409ms
Transfer 8 KB
Monthly Cost €2/mo
assets.gorgias.chat
Other
Costly
Execution 408ms
Transfer 93 KB
Unused 49%
Monthly Cost €2/mo
OneTrust
Consent
Essential
Execution 358ms
Transfer 128 KB
Unused 51%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Costly
Execution 317ms
Transfer 135 KB
Unused 48%
Monthly Cost €2/mo
static.rechargecdn.com
Other
Costly
Execution 252ms
Transfer 119 KB
Unused 63%
Monthly Cost €1/mo
analytics.tiktok.com
Other
Costly
Execution 226ms
Transfer 110 KB
Unused 54%
Monthly Cost €1/mo
us-assets.i.posthog.com
Other
Costly
Execution 225ms
Transfer 65 KB
Unused 51%
Monthly Cost €1/mo
assets.gorgias.chat
Other
Costly
Execution 216ms
Transfer 36 KB
Unused 68%
Monthly Cost €1/mo
static.klaviyo.com
Other
Optional
Execution 187ms
Transfer 52 KB
Unused 81%
Monthly Cost €1/mo
Facebook Pixel
Advertising
Optional
Execution 175ms
Transfer 95 KB
Unused 38%
Monthly Cost €1/mo
static.klaviyo.com
Other
Optional
Execution 169ms
Transfer 1 KB
Monthly Cost €1/mo
d.impactradius-event.com
Other
Optional
Execution 164ms
Transfer 26 KB
Monthly Cost €1/mo
edge.fullstory.com
Other
Optional
Execution 155ms
Transfer 14 KB
Monthly Cost €1/mo
sc-static.net
Other
Optional
Execution 144ms
Transfer 25 KB
Monthly Cost €1/mo
crossborder-integration.global-e.com
Other
Optional
Execution 139ms
Transfer 23 KB
Monthly Cost €1/mo
Facebook Pixel
Advertising
Optional
Execution 95ms
Transfer 28 KB
Monthly Cost €0/mo
static.klaviyo.com
Other
Optional
Execution 83ms
Transfer 23 KB
Monthly Cost €0/mo
static.clairedefermat.com
Other
Optional
Execution 82ms
Transfer 70 KB
Unused 84%
Monthly Cost €0/mo
static.klaviyo.com
Other
Optional
Execution 56ms
Transfer 3 KB
Monthly Cost €0/mo
tr.snapchat.com
Other
Optional
Execution 55ms
Transfer 0 KB
Monthly Cost €0/mo
static.klaviyo.com
Other
Optional
Execution 53ms
Transfer 9 KB
Monthly Cost €0/mo
analytics.tiktok.com
Other
Optional
Execution 53ms
Transfer 40 KB
Monthly Cost €0/mo
www.redditstatic.com
Other
Optional
Execution 52ms
Transfer 19 KB
Monthly Cost €0/mo
OneTrust
Consent
Essential
Execution 50ms
Transfer 9 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 3027ms and costs ~€16/month
  • edge.fullstory.com adds 1804ms and costs ~€10/month
  • Optimizely adds 1423ms and costs ~€8/month
  • Google Tag Manager adds 972ms and costs ~€5/month
  • onsite.joinground.com adds 868ms and costs ~€5/month
  • 21bd15724800.cdn4.forter.com adds 845ms and costs ~€4/month
  • 7ce243a1e1a2.cdn4.forter.com adds 737ms and costs ~€4/month
  • (program):2 adds 692ms and costs ~€4/month
  • Google Tag Manager adds 630ms and costs ~€3/month
  • Google Tag Manager adds 475ms and costs ~€3/month
  • Google Tag Manager adds 448ms and costs ~€2/month
  • static.klaviyo.com adds 409ms and costs ~€2/month
  • assets.gorgias.chat adds 408ms and costs ~€2/month
  • Google Tag Manager adds 317ms and costs ~€2/month
  • static.rechargecdn.com adds 252ms and costs ~€1/month
  • analytics.tiktok.com adds 226ms and costs ~€1/month
  • us-assets.i.posthog.com adds 225ms and costs ~€1/month
  • assets.gorgias.chat adds 216ms and costs ~€1/month

64% 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 3027ms 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 1804ms 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 1423ms 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 972ms 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 868ms 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

21bd15724800.cdn4.forter.com takes 845ms 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

7ce243a1e1a2.cdn4.forter.com takes 737ms 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 692ms 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 630ms 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 475ms 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 448ms 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

static.klaviyo.com takes 409ms 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 408ms 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 OneTrust'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

Google Tag Manager takes 317ms 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

static.rechargecdn.com takes 252ms 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

analytics.tiktok.com takes 226ms 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 analytics.tiktok.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

us-assets.i.posthog.com takes 225ms 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

assets.gorgias.chat takes 216ms 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

68% 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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