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https://sleepfoundation.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
3
PASS
7
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.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

1.98 s

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

5.28 s

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

694 ms

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

0.000

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

2.79 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.

15.17 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
7 PASS 3 REVIEW 5 FIX
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 (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3189ms total JS execution
FIX
3189ms total JS execution
Warning::
Unattributable: 733ms CPU time
Warning::
https://www.sleepfoundation.org/: 518ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-9QPC...: 372ms CPU time
Warning::
https://scripts.clarity.ms/0.8.59/clarity.js: 369ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MCT...: 252ms CPU time
Warning::
Third-party scripts: 3189ms (100% of total)

Main Thread Breakdown

Script Evaluation 59% Other 20% Script Parsing & Compilation 8% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
Unattributable733ms194ms0ms3rd
https://www.sleepfoundation.org/518ms19ms6ms3rd
https://www.googletagmanager.com/gtag/js?id=G-9QPCDX3P15&cx=c&gtm=4e64h1372ms329ms37ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js369ms331ms7ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MCTPTGM252ms202ms40ms3rd
https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.js207ms158ms39ms3rd
https://www.googletagmanager.com/gtag/js?id=G-N7ZJLTJCQM&cx=c&gtm=4e64h1184ms141ms41ms3rd
https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/Render.09c3b018e31bf53360b4.js136ms112ms23ms3rd
https://static.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/1011.598ae9833e51b76bc1c3.js112ms98ms2ms3rd
https://static.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/sharedUtils.b3dbd88419e7ff83722b.js?cb=292ms83ms5ms3rd

Showing top 10 of 13 scripts

D
JS Bundles
Action
38 scripts, 375 KB unused
FIX
38 scripts, 375 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-9QPC...: 71 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-N7ZJ...: 69 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202510.2...: 68 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MCT...: 59 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s3-us-west-2.amazonaws.com/jsstore/a/020H3...: 43 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 375 KB
375 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-9QPCDX3P15&cx=c&gtm=4e64h1175 KB71 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-N7ZJLTJCQM&cx=c&gtm=4e64h1174 KB69 KB (40%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.js124 KB68 KB (55%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MCTPTGM147 KB59 KB (40%)✓3rd
https://s3-us-west-2.amazonaws.com/jsstore/a/020H3E2/ge.js90 KB43 KB (47%)✓3rd
https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/Render.09c3b018e31bf53360b4.js52 KB42 KB (82%)✓3rd
https://www.sleepfoundation.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.131 KB22 KB (72%)✓3rd
https://static.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/vendors~in_app_forms~signup_forms.a899b049d575de74ade1.js?cb=25 KB—✓3rd
https://static.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/event_adapter.b8cd6e2a0811110b50f7.js?cb=21 KB—✓3rd
https://www.clarity.ms/tag/kx7t1moyus1 KB—✓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
Page Weight Inventory
Action
100 resources · 1.7 MB · 375 KB savings available
FIX
100 resources · 1.7 MB · 375 KB savings available
Warning::
Page weight 706 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~375 KB of savings available
Warning::
99 third-party resources (100% of weight)
100 resources · 1.7 MiB · 99 third-party 706.0 KiB over 1MB target
JavaScript 61% · 1.0 MiB
Image 30% · 517.9 KiB
Other 4% · 61.6 KiB
CSS 3% · 48.7 KiB
Document 2% · 38.9 KiB

~374.7 KiB of savings available

Remove unused JavaScript: 374.7 KiB
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.

No Cache-Control header

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

C
Page Weight Budget
Action
1.7 MB transferred, 100 requests
REVIEW
1.7 MB transferred, 100 requests
Info::
Page weighs 4.9 MB (1.7 MB transferred)
Warning::
JavaScript is 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Info::
100 HTTP requests
Info::
Estimated 0.35 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
100 requests
0.35 g CO2 per page load
JavaScript 1.0 MiB 61%
Images 448.3 KiB 26%
Other 70.3 KiB 4%
CSS 44.1 KiB 3%
Other 41.6 KiB 2%
HTML 38.7 KiB 2%
Other 23.5 KiB 1%
Other 660 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

B
Image Optimization
28 images, 0 KB saveable
REVIEW
28 images, 0 KB saveable
Info::
All images are well-optimized
28 images 448 KB
0 oversized -0 KB
8 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
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
100 requests over 4069ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.0 s LCP 5.3 shttps://sleepfoundation.org// https://sleepfoundation.org/ — 301 — 211 B — 34 ms — h2https://www.sleepfoundation.org/www.sleepfoundation.org/ https://www.sleepfoundation.org/ — 200 — 38.7 KiB — 420 ms — h2https://www.sleepfoundation.org/wp-content/themes/onecaremedia-child/build/css/theme-76581-20260410-032059.css?ver=bBBDwawwww.sleepfoundation.org/wp-content/... https://www.sleepfoundation.org/wp-content/themes/onecaremedia-child/build/css/theme-76581-20260410-032059.css?ver=bBBDwaw — 200 — 33.3 KiB — 312 ms — h2https://www.sleepfoundation.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1www.sleepfoundation.org/wp-includes... https://www.sleepfoundation.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 31.1 KiB — 4 ms — h2https://www.sleepfoundation.org/wp-content/uploads/2025/10/sd-logo.svgwww.sleepfoundation.org/wp-content/... https://www.sleepfoundation.org/wp-content/uploads/2025/10/sd-logo.svg — 200 — 4.0 KiB — 6 ms — h3https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2025/07/Product-Attribute-_-Hybrid-Mattress.svgmedia.sleepfoundation.org/image/fet... https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2025/07/Product-Attribute-_-Hybrid-Mattress.svg — 200 — 1.1 KiB — 76 ms — h2https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2025/07/Product-Attribute-_-Pillow-Fill.svgmedia.sleepfoundation.org/image/fet... https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2025/07/Product-Attribute-_-Pillow-Fill.svg — 200 — 639 B — 3 ms — h2https://www.sleepfoundation.org/wp-content/themes/onecaremedia-child/build/js/theme.js?ver=bBBDwawwww.sleepfoundation.org/wp-content/... https://www.sleepfoundation.org/wp-content/themes/onecaremedia-child/build/js/theme.js?ver=bBBDwaw — 200 — 22.4 KiB — 4 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-MCTPTGMwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-MCTPTGM — 200 — 146.6 KiB — 161 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.js?did=018f58a6-9f87-75d8-9b78-7565132763abcdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js?did=018f58a6-9f87-75d8-9b78-7565132763ab — 200 — 9.1 KiB — 108 ms — h2https://www.sleepfoundation.org/wp-content/themes/onecaremedia-child/build/icons/symbol/icons.svgwww.sleepfoundation.org/wp-content/... https://www.sleepfoundation.org/wp-content/themes/onecaremedia-child/build/icons/symbol/icons.svg — 200 — 63.1 KiB — 5 ms — h3https://www.sleepfoundation.org/wp-content/themes/onecaremedia-child/assets/icons/sf-chevron-bold.svgwww.sleepfoundation.org/wp-content/... https://www.sleepfoundation.org/wp-content/themes/onecaremedia-child/assets/icons/sf-chevron-bold.svg — 200 — 871 B — 4 ms — h3https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2025/07/Brand-Messaging-_-Rigorously-Tested-1.svgmedia.sleepfoundation.org/image/fet... https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2025/07/Brand-Messaging-_-Rigorously-Tested-1.svg — 200 — 665 B — 5 ms — h2https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2025/07/WatchPAT.svgmedia.sleepfoundation.org/image/fet... https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2025/07/WatchPAT.svg — 200 — 584 B — 10 ms — h2https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2025/07/Product-Attribute-_-Pillow-Conforming.svgmedia.sleepfoundation.org/image/fet... https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2025/07/Product-Attribute-_-Pillow-Conforming.svg — 200 — 867 B — 19 ms — h2https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2025/07/Product-Attribute-_-CPAP-Noise-Level.svgmedia.sleepfoundation.org/image/fet... https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2025/07/Product-Attribute-_-CPAP-Noise-Level.svg — 200 — 585 B — 19 ms — h2https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2024/11/Helix-Midnight-Luxe_shadow-300x240.pngmedia.sleepfoundation.org/image/fet... https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2024/11/Helix-Midnight-Luxe_shadow-300x240.png — 200 — 7.7 KiB — 21 ms — h2https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2024/11/WinkBed_shadow-300x240.pngmedia.sleepfoundation.org/image/fet... https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2024/11/WinkBed_shadow-300x240.png — 200 — 9.6 KiB — 14 ms — h2https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2020/11/Dreamcloud-Classic-Hybrid-14-scaled-e1775660468472.jpgmedia.sleepfoundation.org/image/fet... https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2020/11/Dreamcloud-Classic-Hybrid-14-scaled-e1775660468472.jpg — 200 — 55.7 KiB — 22 ms — h2https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/w_768,h_513,c_fill/https://www.sleepfoundation.org/wp-content/uploads/2020/09/shutterstock_1034550532-768x513.jpgmedia.sleepfoundation.org/image/fet... https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/w_768,h_513,c_fill/https://www.sleepfoundation.org/wp-content/uploads/2020/09/shutterstock_1034550532-768x513.jpg — 200 — 14.4 KiB — 14 ms — h2https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/w_768,h_512,c_fill/https://www.sleepfoundation.org/wp-content/uploads/2020/09/sleep-apnea-treatments-update-768x512.jpgmedia.sleepfoundation.org/image/fet... https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/w_768,h_512,c_fill/https://www.sleepfoundation.org/wp-content/uploads/2020/09/sleep-apnea-treatments-update-768x512.jpg — 200 — 14.4 KiB — 11 ms — h2https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/w_300,h_200,c_fill/https://www.sleepfoundation.org/wp-content/uploads/2020/09/shutterstock_721660393-300x200.jpgmedia.sleepfoundation.org/image/fet... https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/w_300,h_200,c_fill/https://www.sleepfoundation.org/wp-content/uploads/2020/09/shutterstock_721660393-300x200.jpg — 200 — 4.1 KiB — 11 ms — h2https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/w_300,h_200,c_fill/https://www.sleepfoundation.org/wp-content/uploads/2023/06/a-woman-snoring-300x200.jpgmedia.sleepfoundation.org/image/fet... https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/w_300,h_200,c_fill/https://www.sleepfoundation.org/wp-content/uploads/2023/06/a-woman-snoring-300x200.jpg — 200 — 3.5 KiB — 19 ms — h2https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/w_300,h_200,c_fill/https://www.sleepfoundation.org/wp-content/uploads/2021/12/Is-Sleep-Apnea-Genetic-300x200.jpgmedia.sleepfoundation.org/image/fet... https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/w_300,h_200,c_fill/https://www.sleepfoundation.org/wp-content/uploads/2021/12/Is-Sleep-Apnea-Genetic-300x200.jpg — 200 — 6.6 KiB — 21 ms — h2https://i.ytimg.com/vi_webp/XAymAoVMUFo/maxresdefault.webpi.ytimg.com/vi_webp/XAymAoVMUFo/max... https://i.ytimg.com/vi_webp/XAymAoVMUFo/maxresdefault.webp — 200 — 77.9 KiB — 182 ms — h2https://i.ytimg.com/vi_webp/kCUAPvCXUCc/maxresdefault.webpi.ytimg.com/vi_webp/kCUAPvCXUCc/max... https://i.ytimg.com/vi_webp/kCUAPvCXUCc/maxresdefault.webp — 200 — 60.9 KiB — 140 ms — h2https://i.ytimg.com/vi_webp/5sZHGqyN0u8/maxresdefault.webpi.ytimg.com/vi_webp/5sZHGqyN0u8/max... https://i.ytimg.com/vi_webp/5sZHGqyN0u8/maxresdefault.webp — 200 — 71.9 KiB — 172 ms — h2https://i.ytimg.com/vi_webp/wDfUebgJ3fQ/maxresdefault.webpi.ytimg.com/vi_webp/wDfUebgJ3fQ/max... https://i.ytimg.com/vi_webp/wDfUebgJ3fQ/maxresdefault.webp — 200 — 55.8 KiB — 157 ms — h2https://i.ytimg.com/vi_webp/-HtzWrwuHcI/maxresdefault.webpi.ytimg.com/vi_webp/-HtzWrwuHcI/max... https://i.ytimg.com/vi_webp/-HtzWrwuHcI/maxresdefault.webp — 200 — 42.0 KiB — 187 ms — h2https://secure.gaug.es/track.jssecure.gaug.es/track.js https://secure.gaug.es/track.js — 200 — 4.0 KiB — 448 ms — http/1.1
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h2https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-FPXY3Q5Q3B&cid=58311775.1776803823&gtm=45je64h1v9123591180z8830955845za20gzb830955845zd830955845&rcb=18&aip=1&dma=1&dma_cps=a&gcs=G111&gcd=13t3tPt2t5l1&npa=0&frm=0&tag_exp=0~115938466~115938468~117266400&z=1554215650www.google.es/ads/ga-audiences?v=1&... https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-FPXY3Q5Q3B&cid=58311775.1776803823&gtm=45je64h1v9123591180z8830955845za20gzb830955845zd830955845&rcb=18&aip=1&dma=1&dma_cps=a&gcs=G111&gcd=13t3tPt2t5l1&npa=0&frm=0&tag_exp=0~115938466~115938468~117266400&z=1554215650 — 200 — 408 B — 96 ms — h2https://b-code.liadm.com/lc2.jsb-code.liadm.com/lc2.js https://b-code.liadm.com/lc2.js — 200 — 46.9 KiB — 159 ms — h2https://pro.ip-api.com/json/?key=HjZs0C1fcOqELGS&fields=16990211pro.ip-api.com/json/?key=HjZs0C1fcO... https://pro.ip-api.com/json/?key=HjZs0C1fcOqELGS&fields=16990211 — 200 — 257 B — 154 ms — http/1.1https://static-forms.klaviyo.com/forms/api/v7/TKJEB5/full-formsstatic-forms.klaviyo.com/forms/api/... https://static-forms.klaviyo.com/forms/api/v7/TKJEB5/full-forms — 200 — 17.6 KiB — 29 ms — h2https://www.sleepfoundation.org/wp-content/uploads/2024/02/cropped-favicon_new.pngwww.sleepfoundation.org/wp-content/... https://www.sleepfoundation.org/wp-content/uploads/2024/02/cropped-favicon_new.png — 200 — 5.2 KiB — 4 ms — h3https://www.sleepfoundation.org/wp-content/uploads/2024/02/cropped-favicon_new-32x32.pngwww.sleepfoundation.org/wp-content/... https://www.sleepfoundation.org/wp-content/uploads/2024/02/cropped-favicon_new-32x32.png — 200 — 845 B — 3 ms — h3https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/default~Render~back-in-stock-dynamic-button-handler~ClientStore~.4bf11aa64a4ba2568a3b.jsstatic-tracking.klaviyo.com/onsite/... https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/default~Render~back-in-stock-dynamic-button-handler~ClientStore~.4bf11aa64a4ba2568a3b.js — 200 — 4.4 KiB — 4 ms — h2https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/default~Render~ClientStore~~onsite-back-in-stock.d095d93e14859373a01c.jsstatic-tracking.klaviyo.com/onsite/... https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/default~Render~ClientStore~~onsite-back-in-stock.d095d93e14859373a01c.js — 200 — 4.2 KiB — 5 ms — h2https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/default~Render~ClientStore~.2de4fecba8a3d8d1f45f.jsstatic-tracking.klaviyo.com/onsite/... https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/default~Render~ClientStore~.2de4fecba8a3d8d1f45f.js — 200 — 20.1 KiB — 6 ms — h2https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/ClientStore.6ddd25a5be2d0e002c30.jsstatic-tracking.klaviyo.com/onsite/... https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/ClientStore.6ddd25a5be2d0e002c30.js — 200 — 3.0 KiB — 7 ms — h2https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/onsite-triggering-v2.e7b9a662b5ca75f8770f.jsstatic-tracking.klaviyo.com/onsite/... https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/onsite-triggering-v2.e7b9a662b5ca75f8770f.js — 200 — 6.9 KiB — 3 ms — h2https://rp.liadm.com/j?dtstmp=1776803823099&se=e30&duid=4768fda4d356--01kprw5fc12vbsq754aspdthjm&tv=v3.14.0&pu=https%3A%2F%2Fwww.sleepfoundation.org%2F&wpn=lc-bundle&wpv=v3.14.0&cd=.sleepfoundation.org&pv=20d5b2f1-9eae-4ebe-a38e-b5a3acd21e0brp.liadm.com/j?dtstmp=1776803823099... https://rp.liadm.com/j?dtstmp=1776803823099&se=e30&duid=4768fda4d356--01kprw5fc12vbsq754aspdthjm&tv=v3.14.0&pu=https%3A%2F%2Fwww.sleepfoundation.org%2F&wpn=lc-bundle&wpv=v3.14.0&cd=.sleepfoundation.org&pv=20d5b2f1-9eae-4ebe-a38e-b5a3acd21e0b — 302 — 495 B — 327 ms — h2https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/532.d799b8635a540140e839.cssstatic-tracking.klaviyo.com/onsite/... https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/532.d799b8635a540140e839.css — 200 — 9.3 KiB — 9 ms — h2https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/styles.3e7fa65f2ececea7cad2.jsstatic-tracking.klaviyo.com/onsite/... https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/styles.3e7fa65f2ececea7cad2.js — 200 — 4.5 KiB — 3 ms — h2https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/vendors~Render.4aced80dbbd41a0ae3f3.jsstatic-tracking.klaviyo.com/onsite/... https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/vendors~Render.4aced80dbbd41a0ae3f3.js — 200 — 7.1 KiB — 4 ms — h2https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/Render.09c3b018e31bf53360b4.jsstatic-tracking.klaviyo.com/onsite/... https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/Render.09c3b018e31bf53360b4.js — 200 — 51.5 KiB — 10 ms — h2https://rp4.liadm.com/j?dtstmp=1776803823099&se=e30&duid=4768fda4d356--01kprw5fc12vbsq754aspdthjm&tv=v3.14.0&pu=https%3A%2F%2Fwww.sleepfoundation.org%2F&wpn=lc-bundle&wpv=v3.14.0&cd=.sleepfoundation.org&pv=20d5b2f1-9eae-4ebe-a38e-b5a3acd21e0b&i6=MjAwMTo0MWQwOmFiMDA6OjQ6MDozNzg%3D&n3pc=truerp4.liadm.com/j?dtstmp=177680382309... https://rp4.liadm.com/j?dtstmp=1776803823099&se=e30&duid=4768fda4d356--01kprw5fc12vbsq754aspdthjm&tv=v3.14.0&pu=https%3A%2F%2Fwww.sleepfoundation.org%2F&wpn=lc-bundle&wpv=v3.14.0&cd=.sleepfoundation.org&pv=20d5b2f1-9eae-4ebe-a38e-b5a3acd21e0b&i6=MjAwMTo0MWQwOmFiMDA6OjQ6MDozNzg%3D&n3pc=true — 200 — 249 B — 465 ms — h2https://idx.liadm.com/idex/unknown/72731?duid=4768fda4d356--01kprw5fc12vbsq754aspdthjm&cd=.sleepfoundation.org&pu=https%3A%2F%2Fwww.sleepfoundation.org%2F&qf=0.9&resolve=md5idx.liadm.com/idex/unknown/72731?du... https://idx.liadm.com/idex/unknown/72731?duid=4768fda4d356--01kprw5fc12vbsq754aspdthjm&cd=.sleepfoundation.org&pu=https%3A%2F%2Fwww.sleepfoundation.org%2F&qf=0.9&resolve=md5 — 204 — 377 B — 340 ms — h2https://alocdn.com/c/vn3d8u2u/a/xtarget/p.jsonalocdn.com/c/vn3d8u2u/a/xtarget/p.j... https://alocdn.com/c/vn3d8u2u/a/xtarget/p.json — 302 — 466 B — 565 ms — h2https://alocdn.com/c/vn3d8u2u/a/xtarget/p.json?tdc=1&url=https%3A%2F%2Fwww.sleepfoundation.org%2Falocdn.com/c/vn3d8u2u/a/xtarget/p.j... https://alocdn.com/c/vn3d8u2u/a/xtarget/p.json?tdc=1&url=https%3A%2F%2Fwww.sleepfoundation.org%2F — 200 — 410 B — 182 ms — h2https://j.clarity.ms/collectj.clarity.ms/collect https://j.clarity.ms/collect — 204 — 287 B — 105 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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 3189ms · 848KB · $42/mo
Unattributable
Other
Costly
Execution 733ms
Transfer 0 KB
Monthly Cost $10/mo
www.sleepfoundation.org
Other
Costly
Execution 518ms
Transfer 39 KB
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 372ms
Transfer 175 KB
Unused 41%
Monthly Cost $5/mo
Microsoft Clarity
Session Replay
Costly
Execution 369ms
Transfer 26 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 252ms
Transfer 147 KB
Unused 40%
Monthly Cost $3/mo
OneTrust
Consent
Essential
Execution 207ms
Transfer 124 KB
Unused 55%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 184ms
Transfer 174 KB
Unused 40%
Monthly Cost $2/mo
static-tracking.klaviyo.com
Other
Optional
Execution 136ms
Transfer 52 KB
Unused 82%
Monthly Cost $2/mo
static.klaviyo.com
Other
Optional
Execution 112ms
Transfer 8 KB
Monthly Cost $1/mo
static.klaviyo.com
Other
Optional
Execution 92ms
Transfer 23 KB
Monthly Cost $1/mo
b-code.liadm.com
Other
Optional
Execution 92ms
Transfer 47 KB
Monthly Cost $1/mo
static.klaviyo.com
Other
Optional
Execution 65ms
Transfer 10 KB
Monthly Cost $1/mo
www.sleepfoundation.org
Other
Optional
Execution 58ms
Transfer 22 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 733ms and costs ~$10/month
  • www.sleepfoundation.org adds 518ms and costs ~$7/month
  • Google Tag Manager adds 372ms and costs ~$5/month
  • Microsoft Clarity adds 369ms and costs ~$5/month
  • Google Tag Manager adds 252ms and costs ~$3/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 733ms 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.sleepfoundation.org takes 518ms 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 372ms 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

Microsoft Clarity takes 369ms 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 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

55% 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

82% of static-tracking.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

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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