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https://www.withings.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
65
GRADE
D
FIX
5
REVIEW
2
PASS
5
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.
81
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.
77
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.

8.77 s

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

28.79 s

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

4.43 s

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

0.024

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

14.24 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.

36.92 s

Page Load Progression

850 ms
1.7 s
2.6 s
3.4 s
4.3 s
5.1 s
6.0 s
6.8 s
Checks
14
5 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
12.2 MB transferred, 197 requests
FIX
12.2 MB transferred, 197 requests
Critical::
Page weighs 20.4 MB (12.2 MB transferred)
Warning::
Images are 3.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.2 MB
Warning::
JavaScript is 2.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.6 MB
Info::
Fonts are 283 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 283 KB
Warning::
197 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.6 g CO2 per page load
12.2 MB / 2.4 MB budget
12.2 MB transferred
197 requests
2.6 g CO2 per page load
Other 5.6 MiB 46%
Images 3.2 MiB 26%
JavaScript 2.6 MiB 21%
Other 429.8 KiB 3%
Fonts 282.7 KiB 2%
CSS 131.1 KiB 1%
HTML 64.0 KiB 1%
Other 2.1 KiB 0%
Other 1.8 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (12.2 MiB of 12.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
18022ms total JS execution
FIX
18022ms total JS execution
Warning::
https://www-assets.withings.com/site/js/cart.sideb...: 3528ms CPU time
Warning::
Unattributable: 3173ms CPU time
Warning::
https://www-assets.withings.com/site/js/main.wi.mi...: 2427ms CPU time
Warning::
https://metrics.withings.com/f37tye7q7kpxzba.js?aw...: 1933ms CPU time
Warning::
https://www.withings.com/eu/en/: 1554ms CPU time
Warning::
Third-party scripts: 16271ms (90% of total)

Main Thread Breakdown

Script Evaluation 51% Other 26% Style & Layout 11% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www-assets.withings.com/site/js/cart.sidebar/prod/en/polyfills.bbe2b420840e6ddf7153e0d6b975ba3fcaf4d038.js3528ms2906ms2ms3rd
Unattributable3173ms265ms0ms3rd
https://www-assets.withings.com/site/js/main.wi.min.bbe2b420840e6ddf7153e0d6b975ba3fcaf4d038.js2427ms611ms151ms3rd
https://metrics.withings.com/f37tye7q7kpxzba.js?aw=TH6CL41933ms1719ms120ms3rd
https://www.withings.com/eu/en/1554ms157ms18ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-WLCVVSPW990ms672ms113ms3rd
https://sdk.privacy-center.org/sdk/5d68cf27fcc4e658e7bf39722c7dd84c606f7f7b/modern/sdk.5d68cf27fcc4e658e7bf39722c7dd84c606f7f7b.js795ms607ms58ms3rd
https://js.klarna.com/web-sdk/v1/1.0.192/sdk.js729ms471ms5ms3rd
https://sdk.privacy-center.org/sdk/5d68cf27fcc4e658e7bf39722c7dd84c606f7f7b/modern/ui-web-en-web.5d68cf27fcc4e658e7bf39722c7dd84c606f7f7b.js594ms288ms54ms3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js476ms283ms172ms3rd

Showing top 10 of 25 scripts

F
JS Bundles
Action
57 scripts, 1.3 MB unused
FIX
57 scripts, 1.3 MB unused
Warning::
https://www-assets.withings.com/site/js/main.wi.mi...: 189 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 179 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 179 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 179 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www-assets.withings.com/site/js/cart.sideb...: 170 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.3 MB
1315 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www-assets.withings.com/site/js/main.wi.min.bbe2b420840e6ddf7153e0d6b975ba3fcaf4d038.js264 KB189 KB (72%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js0 KB179 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB179 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js362 KB179 KB (49%)✓3rd
https://www-assets.withings.com/site/js/cart.sidebar/prod/en/main.bbe2b420840e6ddf7153e0d6b975ba3fcaf4d038.js290 KB170 KB (59%)✓3rd
https://js.klarna.com/web-sdk/v1/1.0.192/sdk.js136 KB69 KB (51%)✓3rd
https://metrics.withings.com/f37tye7q7kpxzba.js?aw=TH6CL4153 KB67 KB (44%)✓3rd
https://www-assets.withings.com/site/js/account.sidebar/prod/en/main.bbe2b420840e6ddf7153e0d6b975ba3fcaf4d038.js97 KB64 KB (66%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WLCVVSPW140 KB62 KB (45%)✓3rd
https://maps.googleapis.com/maps-api-v3/api/js/64/7d/main.js83 KB54 KB (66%)✓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.

No Cache-Control header

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

C
Image Optimization
Action
93 images, 0 KB saveable
REVIEW
93 images, 0 KB saveable
Warning::
https://media-cdn.withings.com/press/logo_withings... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.withings.com/web/images/reassurances... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.withings.com/web/images/reassurances... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://image-cache.withings.com/site/media/wi_pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://image-cache.withings.com/site/media/wi_pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.withings.com/web/images/reassurances... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www-assets.withings.com/site/media/icons/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.withings.com/web/images/homepage/log... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www-assets.withings.com/site/media/icons/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www-assets.withings.com/site/media/icons/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://image-cache.withings.com/site/media/wi_pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.withings.com/web/images/reassurances... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.withings.com/web/images/reassurances... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
93 images 3.2 MB
0 oversized -0 KB
89 legacy format
13 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

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

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
6 fonts (283 KB)
PASS
6 fonts (283 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

283 KB total

Render-blocking

0

of 6

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 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s FCP 8.8 s LCP 28.8 shttps://www-assets.withings.com/site/media/fonts/aeonik/Aeonik-Regular.woff2Aeonik-Regular.woff2 https://www-assets.withings.com/site/media/fonts/aeonik/Aeonik-Regular.woff2 — 42.0 KiB — 0 ms — font-display: swaphttps://www-assets.withings.com/site/media/fonts/aeonik/Aeonik-Medium.woff2Aeonik-Medium.woff2 https://www-assets.withings.com/site/media/fonts/aeonik/Aeonik-Medium.woff2 — 44.0 KiB — 0 ms — font-display: swaphttps://www-assets.withings.com/site/media/fonts/icons/withings-icon.ttf?ktibljwithings-icon.ttf https://www-assets.withings.com/site/media/fonts/icons/withings-icon.ttf?ktiblj — 74.8 KiB — 0 ms — font-display: swaphttps://www-assets.withings.com/site/media/fonts/aeonik/Aeonik-Light.woff2Aeonik-Light.woff2 https://www-assets.withings.com/site/media/fonts/aeonik/Aeonik-Light.woff2 — 43.4 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 0 ms — font-display: swaphttps://www-assets.withings.com/site/media/fonts/aeonik/Aeonik-Bold.woff2Aeonik-Bold.woff2 https://www-assets.withings.com/site/media/fonts/aeonik/Aeonik-Bold.woff2 — 44.7 KiB — 0 ms — font-display: swap
Aeonik-Regular.woff2 woff2 swap
Size 42 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Aeonik-Medium.woff2 woff2 swap
Size 44 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
withings-icon.ttf ttf swap
Size 75 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
Aeonik-Light.woff2 woff2 swap
Size 43 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Aeonik-Bold.woff2 woff2 swap
Size 45 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 ~22 KB and ~44 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
1
preload
1
dns-prefetch
1
prefetch
—

3 resource hints configured

Network Waterfall
197 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
90% of JavaScript execution is third-party
First-party Third-party 16271ms · 1292KB · €86/mo
www-assets.withings.com
Other
Costly
Execution 3528ms
Transfer 18 KB
Monthly Cost €19/mo
Unattributable
Other
Costly
Execution 3173ms
Transfer 0 KB
Monthly Cost €17/mo
www-assets.withings.com
Other
Costly
Execution 2427ms
Transfer 264 KB
Unused 72%
Monthly Cost €13/mo
metrics.withings.com
Other
Costly
Execution 1933ms
Transfer 153 KB
Unused 44%
Monthly Cost €10/mo
Google Tag Manager
Tag Manager
Costly
Execution 990ms
Transfer 140 KB
Unused 45%
Monthly Cost €5/mo
sdk.privacy-center.org
Other
Costly
Execution 795ms
Transfer 90 KB
Unused 49%
Monthly Cost €4/mo
js.klarna.com
Other
Costly
Execution 729ms
Transfer 136 KB
Unused 51%
Monthly Cost €4/mo
sdk.privacy-center.org
Other
Costly
Execution 594ms
Transfer 53 KB
Monthly Cost €3/mo
www.gstatic.com
Other
Costly
Execution 476ms
Transfer 0 KB
Unused 49%
Monthly Cost €3/mo
www-assets.withings.com
Other
Costly
Execution 210ms
Transfer 47 KB
Unused 64%
Monthly Cost €1/mo
maps.googleapis.com
Other
Optional
Execution 187ms
Transfer 83 KB
Unused 66%
Monthly Cost €1/mo
cdn.shipup.co
Other
Optional
Execution 176ms
Transfer 27 KB
Monthly Cost €1/mo
static.klaviyo.com
Other
Optional
Execution 156ms
Transfer 1 KB
Monthly Cost €1/mo
pay.google.com
Other
Optional
Execution 121ms
Transfer 59 KB
Unused 52%
Monthly Cost €1/mo
static.klaviyo.com
Other
Optional
Execution 116ms
Transfer 3 KB
Monthly Cost €1/mo
www-assets.withings.com
Other
Optional
Execution 113ms
Transfer 2 KB
Monthly Cost €1/mo
static.klaviyo.com
Other
Optional
Execution 100ms
Transfer 2 KB
Monthly Cost €1/mo
www-assets.withings.com
Other
Optional
Execution 99ms
Transfer 78 KB
Monthly Cost €1/mo
js.klarna.com
Other
Optional
Execution 85ms
Transfer 24 KB
Monthly Cost €0/mo
static.klaviyo.com
Other
Optional
Execution 83ms
Transfer 19 KB
Monthly Cost €0/mo
sdk.privacy-center.org
Other
Optional
Execution 69ms
Transfer 57 KB
Monthly Cost €0/mo
cdn.rollbar.com
Other
Optional
Execution 57ms
Transfer 24 KB
Monthly Cost €0/mo
static-tracking.klaviyo.com
Other
Optional
Execution 54ms
Transfer 14 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • www-assets.withings.com adds 3528ms and costs ~€19/month
  • Unattributable adds 3173ms and costs ~€17/month
  • www-assets.withings.com adds 2427ms and costs ~€13/month
  • metrics.withings.com adds 1933ms and costs ~€10/month
  • Google Tag Manager adds 990ms and costs ~€5/month
  • sdk.privacy-center.org adds 795ms and costs ~€4/month
  • js.klarna.com adds 729ms and costs ~€4/month
  • sdk.privacy-center.org adds 594ms and costs ~€3/month
  • www.gstatic.com adds 476ms and costs ~€3/month
  • www-assets.withings.com adds 210ms and costs ~€1/month

90% 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

www-assets.withings.com takes 3528ms 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

Unattributable takes 3173ms 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-assets.withings.com takes 2427ms 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

72% of www-assets.withings.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

metrics.withings.com takes 1933ms 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 990ms 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

sdk.privacy-center.org takes 795ms 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

js.klarna.com takes 729ms 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 js.klarna.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

sdk.privacy-center.org takes 594ms 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 476ms 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-assets.withings.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

64% of www-assets.withings.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

66% of maps.googleapis.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 pay.google.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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