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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
25
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
69
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.

12.38 s

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

19.19 s

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

17.87 s

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.

12.70 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.

59.26 s

Page Load Progression

517 ms
1.0 s
1.6 s
2.1 s
2.6 s
3.1 s
3.6 s
4.1 s
Checks
16
7 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
7.4 MB transferred, 341 requests
FIX
7.4 MB transferred, 341 requests
Critical::
Page weighs 25.3 MB (7.4 MB transferred)
Warning::
JavaScript is 6.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 6.4 MB
Warning::
341 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.6 g CO2 per page load
7.4 MB / 2.4 MB budget
7.4 MB transferred
341 requests
1.6 g CO2 per page load
JavaScript 6.4 MiB 86%
Images 480.8 KiB 6%
HTML 197.9 KiB 3%
Other 188.2 KiB 2%
Other 137.0 KiB 2%
CSS 55.1 KiB 1%
Fonts 33.9 KiB 0%
Other 7.4 KiB 0%
Other 3.6 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

F
JS Execution Cost
Action
45848ms total JS execution
FIX
45848ms total JS execution
Warning::
https://www.sephora.com/resources/87b0af1604642a03...: 16639ms CPU time
Warning::
https://www.sephora.com/: 11214ms CPU time
Warning::
Unattributable: 3288ms CPU time
Warning::
https://www.sephora.com/149e9513-01fa-4fb0-aad4-56...: 2800ms CPU time
Warning::
https://www.sephora.com/Cu1NG9QHJy1mN/MV78Hs/yFvck...: 1283ms CPU time
Info::
Third-party scripts: 10257ms (22% of total)

Main Thread Breakdown

Script Evaluation 84% Other 6% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.sephora.com/resources/87b0af1604642a03f9e3b5f9aca755a11630011008b7416639ms15647ms104ms1st
https://www.sephora.com/11214ms9633ms38ms1st
Unattributable3288ms1517ms1ms3rd
https://www.sephora.com/149e9513-01fa-4fb0-aad4-566afd725d1b/2d206a39-8ed7-437e-a3be-862e0f06eea3/ips.js?ak_bmsc-kp=03kUmb5cE7YhH73tCYjtLjJ78iwe40GeFpyYQ7sJ9grlJB52LvoYTD3B5gK2T61uIwzxUemr7GJJ0cd26Ec4MyKcTxHe2p1EzXMaZKXMGEBoMo7mGVqpShlB0bu6VbFjn1PoqBPpedi0Ox6OdOrWjDp4MOiuFjEZ8FVqftniuorVuoIDHF&x-kpsdk-v=j-1.2.308&x-kpsdk-im=AALL7DBFKG4xqLvEpIVkpzcKY9AdY-OWu7F6OuoR6XMw1ewiNZuMMU312koIxFy5WksnKPGxqJFgG1GnoCUvrT77Oxw2800ms2527ms50ms1st
https://www.sephora.com/Cu1NG9QHJy1mN/MV78Hs/yFvckEwo/N11kVcuaDOOa4c/c2dx/VTkV/e159LyEB1283ms1093ms108ms1st
https://www.sephora.com/Cu1NG9QHJy1mN/MV78Hs/yFvckEwo/6b1kVcua/SHl1/WgdV/bCceEThu?v=e874a147-1f59-895a-4120-b4b4b2fe54351092ms982ms44ms1st
https://www.sephora.com/js/ufe/isomorphic/main.bundle.B107CoriginmasterD20260402205602.js996ms577ms414ms1st
https://e309da9b9aaf.cdn4.forter.com/sn/e309da9b9aaf/script.js779ms670ms40ms3rd
https://assets.adobedtm.com/2f3ab3feab3d/ad943721620d/launch-1aafb95a572f.min.js471ms379ms61ms3rd
https://api.bluecore.com/triggermail.js/sephora.js468ms379ms41ms3rd

Showing top 10 of 52 scripts

F
JS Bundles
Action
130 scripts, 2.9 MB unused
FIX
130 scripts, 2.9 MB unused
Warning::
https://www.sephora.com/js/ufe/isomorphic/main.bun...: 543 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.sephora.com/js/ufe/isomorphic/commons....: 249 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.sephora.com/js/ufe/isomorphic/postload...: 216 KB unused (95%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 167 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 167 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.9 MB
2932 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.sephora.com/js/ufe/isomorphic/main.bundle.B107CoriginmasterD20260402205602.js964 KB543 KB (57%)✓1st
https://www.sephora.com/js/ufe/isomorphic/commons.chunk.B107CoriginmasterD20260402205602.js313 KB249 KB (80%)✓1st
https://www.sephora.com/js/ufe/isomorphic/postload.chunk.B107CoriginmasterD20260402205602.js227 KB216 KB (95%)✓1st
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB167 KB (46%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js0 KB167 KB (46%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js0 KB167 KB (46%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB167 KB (46%)✓3rd
https://www.sephora.com/js/ufe/isomorphic/priority.chunk.B107CoriginmasterD20260402205602.js165 KB145 KB (88%)✓1st
https://e309da9b9aaf.cdn4.forter.com/sn/e309da9b9aaf/script.js216 KB91 KB (42%)✓3rd
https://api.bluecore.com/triggermail.js/sephora.js101 KB71 KB (71%)✓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: max-age=0, no-cache, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, no-cache, no-store

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-cache—Cache but always revalidate first
no-store—Never cache this response
B
Third-Party Impact
50% third-party, 0 ms blocking
REVIEW
50% third-party, 0 ms blocking
Info::
Third-party code accounts for 50% of page weight (3.7 MiB of 7.4 MiB)
Info::
Third-party blocking time is low (0 ms)
50%
50%
First-party Third-party
B
Image Optimization
62 images, 0 KB saveable
REVIEW
62 images, 0 KB saveable
Info::
All images are well-optimized
62 images 481 KB
0 oversized -0 KB
40 legacy format
0 missing dimensions CLS risk
C
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
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
1 fonts (34 KB)
PASS
1 fonts (34 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

34 KB total

Render-blocking

0

of 1

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 20.0 s FCP 12.4 s LCP 19.2 shttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 0 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 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+
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
Network Waterfall
341 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
22% of JavaScript execution is third-party
First-party Third-party 10257ms · 2281KB · $136/mo
Unattributable
Other
Costly
Execution 3288ms
Transfer 0 KB
Monthly Cost $44/mo
e309da9b9aaf.cdn4.forter.com
Other
Costly
Execution 779ms
Transfer 216 KB
Unused 42%
Monthly Cost $10/mo
assets.adobedtm.com
Other
Costly
Execution 471ms
Transfer 107 KB
Unused 26%
Monthly Cost $6/mo
api.bluecore.com
Other
Costly
Execution 468ms
Transfer 101 KB
Unused 71%
Monthly Cost $6/mo
js-cdn.dynatrace.com
Other
Costly
Execution 444ms
Transfer 130 KB
Unused 36%
Monthly Cost $6/mo
cdn.clarip.com
Other
Costly
Execution 391ms
Transfer 4 KB
Monthly Cost $5/mo
www.gstatic.com
Other
Costly
Execution 344ms
Transfer 0 KB
Unused 46%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 309ms
Transfer 178 KB
Unused 36%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 304ms
Transfer 133 KB
Unused 45%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 285ms
Transfer 147 KB
Unused 37%
Monthly Cost $4/mo
resources.digital-cloud.medallia.com
Other
Costly
Execution 218ms
Transfer 70 KB
Unused 55%
Monthly Cost $3/mo
analytics.tiktok.com
Other
Costly
Execution 210ms
Transfer 110 KB
Unused 54%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 184ms
Transfer 133 KB
Unused 46%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 174ms
Transfer 130 KB
Unused 43%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 162ms
Transfer 128 KB
Unused 48%
Monthly Cost $2/mo
js.appboycdn.com
Other
Optional
Execution 158ms
Transfer 55 KB
Unused 51%
Monthly Cost $2/mo
assets.adobedtm.com
Other
Optional
Execution 150ms
Transfer 4 KB
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 140ms
Transfer 95 KB
Unused 35%
Monthly Cost $2/mo
sc-static.net
Other
Optional
Execution 129ms
Transfer 25 KB
Monthly Cost $2/mo
cdn.gladly.com
Other
Optional
Execution 127ms
Transfer 43 KB
Unused 52%
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 122ms
Transfer 78 KB
Unused 70%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 117ms
Transfer 115 KB
Unused 55%
Monthly Cost $2/mo
scripts.postie.com
Other
Optional
Execution 108ms
Transfer 27 KB
Monthly Cost $1/mo
cnstrc.com
Other
Optional
Execution 101ms
Transfer 67 KB
Unused 59%
Monthly Cost $1/mo
assets.adobedtm.com
Other
Optional
Execution 97ms
Transfer 1 KB
Monthly Cost $1/mo
assets.adobedtm.com
Other
Optional
Execution 91ms
Transfer 1 KB
Monthly Cost $1/mo
assets.adobedtm.com
Other
Optional
Execution 90ms
Transfer 1 KB
Monthly Cost $1/mo
assets.adobedtm.com
Other
Optional
Execution 85ms
Transfer 1 KB
Monthly Cost $1/mo
Bing UET
Advertising
Optional
Execution 80ms
Transfer 16 KB
Monthly Cost $1/mo
cdnjs
CDN
Optional
Execution 76ms
Transfer 23 KB
Monthly Cost $1/mo
assets.adobedtm.com
Other
Optional
Execution 74ms
Transfer 1 KB
Monthly Cost $1/mo
assets.adobedtm.com
Other
Optional
Execution 73ms
Transfer 1 KB
Monthly Cost $1/mo
assets.adobedtm.com
Other
Optional
Execution 66ms
Transfer 1 KB
Monthly Cost $1/mo
assets.adobedtm.com
Other
Optional
Execution 65ms
Transfer 1 KB
Monthly Cost $1/mo
assets.adobedtm.com
Other
Optional
Execution 61ms
Transfer 1 KB
Monthly Cost $1/mo
Facebook Pixel
Advertising
Optional
Execution 59ms
Transfer 37 KB
Monthly Cost $1/mo
s.go-mpulse.net
Other
Optional
Execution 55ms
Transfer 60 KB
Unused 44%
Monthly Cost $1/mo
assistjs.skimresources.com
Other
Optional
Execution 52ms
Transfer 2 KB
Monthly Cost $1/mo
analytics.tiktok.com
Other
Optional
Execution 51ms
Transfer 40 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 3288ms and costs ~$44/month
  • e309da9b9aaf.cdn4.forter.com adds 779ms and costs ~$10/month
  • assets.adobedtm.com adds 471ms and costs ~$6/month
  • api.bluecore.com adds 468ms and costs ~$6/month
  • js-cdn.dynatrace.com adds 444ms and costs ~$6/month
  • cdn.clarip.com adds 391ms and costs ~$5/month
  • www.gstatic.com adds 344ms and costs ~$5/month
  • Google Tag Manager adds 309ms and costs ~$4/month
  • Google Tag Manager adds 304ms and costs ~$4/month
  • Google Tag Manager adds 285ms and costs ~$4/month
  • resources.digital-cloud.medallia.com adds 218ms and costs ~$3/month
  • analytics.tiktok.com adds 210ms and costs ~$3/month

Unattributable takes 3288ms 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

e309da9b9aaf.cdn4.forter.com takes 779ms 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.adobedtm.com takes 471ms 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

api.bluecore.com takes 468ms 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

71% of api.bluecore.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

js-cdn.dynatrace.com takes 444ms 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

cdn.clarip.com takes 391ms 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.gstatic.com takes 344ms 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 309ms 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 304ms 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 285ms 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

resources.digital-cloud.medallia.com takes 218ms 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

55% of resources.digital-cloud.medallia.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 210ms 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

51% of js.appboycdn.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

52% of cdn.gladly.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

70% of Facebook Pixel'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

55% of Google Tag Manager'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

59% of cnstrc.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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