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https://sleepfoundation.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
100
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

510 ms

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

750 ms

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

0 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.

627 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.16 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
15
5 PASS 4 REVIEW 4 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
37 scripts, 307 KB unused
FIX
37 scripts, 307 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://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 (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static-tracking.klaviyo.com/onsite/js/buil...: 42 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 307 KB
307 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://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 (48%)✓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=24 KB—✓3rd
https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/post_identification_sync.7ab744259835bf66561d.js?cb=22 KB—✓3rd
https://static.klaviyo.com/onsite/js/klaviyo.js?company_id=TKJEB53 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
88 resources · 1.5 MB · 307 KB savings available
FIX
88 resources · 1.5 MB · 307 KB savings available
Warning::
Page weight 561 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~307 KB of savings available
Warning::
87 third-party resources (100% of weight)
88 resources · 1.5 MiB · 87 third-party 560.9 KiB over 1MB target
JavaScript 59% · 929.6 KiB
Image 35% · 548.8 KiB
CSS 3% · 44.1 KiB
Document 2% · 38.9 KiB
Other 1% · 23.5 KiB

~306.8 KiB of savings available

Remove unused JavaScript: 306.8 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.

B
Page Weight Budget
1.5 MB transferred, 88 requests
REVIEW
1.5 MB transferred, 88 requests
Info::
Page weighs 4.2 MB (1.5 MB transferred)
Warning::
JavaScript is 930 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 930 KB
Info::
88 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
88 requests
0.32 g CO2 per page load
JavaScript 929.6 KiB 59%
Images 479.6 KiB 30%
Other 70.3 KiB 4%
CSS 44.1 KiB 3%
HTML 38.7 KiB 2%
Other 20.5 KiB 1%
Other 1.4 KiB 0%
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
25 images, 0 KB saveable
REVIEW
25 images, 0 KB saveable
Info::
All images are well-optimized
25 images 480 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
575ms total JS execution
REVIEW
575ms total JS execution
Info::
https://www.sleepfoundation.org/: 129ms CPU time
Info::
Unattributable: 120ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-9QPC...: 102ms CPU time
Info::
https://scripts.clarity.ms/0.8.59/clarity.js: 87ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-MCT...: 84ms CPU time
Warning::
Third-party scripts: 575ms (100% of total)

Main Thread Breakdown

Script Evaluation 59% Other 18% Style & Layout 9% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.sleepfoundation.org/129ms7ms2ms3rd
Unattributable120ms19ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-9QPCDX3P15&cx=c&gtm=4e64h1102ms83ms10ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js87ms80ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MCTPTGM84ms69ms13ms3rd
https://www.googletagmanager.com/gtag/js?id=G-N7ZJLTJCQM&cx=c&gtm=4e64h153ms36ms13ms3rd
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
Network Waterfall
88 requests over 13224ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 510 ms LCP 750 mshttps://sleepfoundation.org// https://sleepfoundation.org/ — 301 — 211 B — 33 ms — h2https://www.sleepfoundation.org/www.sleepfoundation.org/ https://www.sleepfoundation.org/ — 200 — 38.7 KiB — 234 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 — 17 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 — 15 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 — 5 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 — 21 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 — 20 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 — 12 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 — 173 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 — 11 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 — 8 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 — 583 B — 8 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 — 644 B — 20 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 — 17 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 — 17 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 — 9.8 KiB — 17 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 — 27 ms — h2https://secure.gaug.es/track.jssecure.gaug.es/track.js https://secure.gaug.es/track.js — 200 — 4.0 KiB — 458 ms — http/1.1https://s3-us-west-2.amazonaws.com/jsstore/a/020H3E2/ge.jss3-us-west-2.amazonaws.com/jsstore/... https://s3-us-west-2.amazonaws.com/jsstore/a/020H3E2/ge.js — 200 — 90.4 KiB — 929 ms — http/1.1https://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 — 26 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 — 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/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 — 3.8 KiB — 17 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 — 23 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 — 10 ms — h2https://media.sleepfoundation.org/image/fetch/f_auto,fl_lossy,q_auto:eco/https://www.sleepfoundation.org/wp-content/uploads/2020/04/Mattress-Roundtable18-768x432.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/2020/04/Mattress-Roundtable18-768x432.jpg — 200 — 46.0 KiB — 14 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 — 78.2 KiB — 120 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 — 60.6 KiB — 139 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 — 149 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 — 158 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 — 158 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 510 ms LCP 750 mshttps://sleepfoundation.org// https://sleepfoundation.org/ — 301 — 211 B — 33 ms — h2https://www.sleepfoundation.org/www.sleepfoundation.org/ https://www.sleepfoundation.org/ — 200 — 38.7 KiB — 234 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 — 17 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 — 15 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 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h2https://rp4.liadm.com/j?dtstmp=1776803841552&se=e30&duid=4768fda4d356--01kprw61cf12dkdbvp4pe46t1a&tv=v3.14.0&pu=https%3A%2F%2Fwww.sleepfoundation.org%2F&wpn=lc-bundle&wpv=v3.14.0&cd=.sleepfoundation.org&pv=bce4a40d-277a-4634-a195-9d4ea2129668&i6=MjAwMTo0MWQwOmFiMDA6OjQ6MDozNzg%3D&n3pc=truerp4.liadm.com/j?dtstmp=177680384155... https://rp4.liadm.com/j?dtstmp=1776803841552&se=e30&duid=4768fda4d356--01kprw61cf12dkdbvp4pe46t1a&tv=v3.14.0&pu=https%3A%2F%2Fwww.sleepfoundation.org%2F&wpn=lc-bundle&wpv=v3.14.0&cd=.sleepfoundation.org&pv=bce4a40d-277a-4634-a195-9d4ea2129668&i6=MjAwMTo0MWQwOmFiMDA6OjQ6MDozNzg%3D&n3pc=true — 200 — 249 B — 299 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 — 3 ms — 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https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/Render.09c3b018e31bf53360b4.js — 200 — 51.5 KiB — 4 ms — h2https://idx.liadm.com/idex/unknown/72731?duid=4768fda4d356--01kprw61cf12dkdbvp4pe46t1a&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--01kprw61cf12dkdbvp4pe46t1a&cd=.sleepfoundation.org&pu=https%3A%2F%2Fwww.sleepfoundation.org%2F&qf=0.9&resolve=md5 — 204 — 377 B — 298 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 — 543 ms — h2https://j.clarity.ms/collectj.clarity.ms/collect https://j.clarity.ms/collect — 204 — 287 B — 101 ms — http/1.1https://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 — -1 — 0 B — 10.2 s —
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 575ms · 561KB · $8/mo
www.sleepfoundation.org
Other
Optional
Execution 129ms
Transfer 39 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 120ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 102ms
Transfer 175 KB
Unused 41%
Monthly Cost $1/mo
Microsoft Clarity
Session Replay
Optional
Execution 87ms
Transfer 26 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 84ms
Transfer 147 KB
Unused 40%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 53ms
Transfer 174 KB
Unused 40%
Monthly Cost $1/mo

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

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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