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https://sensconverter.org

Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
96
GRADE
A
FIX
0
REVIEW
3
PASS
20
INFO
4

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

Mobile Desktop
79
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
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.

2.10 s

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

3.94 s

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

289 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.

2.71 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.

3.94 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
27
20 PASS 3 REVIEW
C
JS Execution Cost
Action
1344ms total JS execution
REVIEW
1344ms total JS execution
Warning::
https://sensconverter.org/: 398ms CPU time
Warning::
https://sensconverter.org/_next/static/chunks/59-5...: 317ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-3XZB...: 248ms CPU time
Info::
https://sensconverter.org/_next/static/chunks/aec7...: 227ms CPU time
Info::
Unattributable: 154ms CPU time
Info::
Third-party scripts: 248ms (18% of total)

Main Thread Breakdown

Script Evaluation 51% Other 23% Style & Layout 15% Script Parsing & Compilation 7% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://sensconverter.org/398ms6ms15ms1st
https://sensconverter.org/_next/static/chunks/59-548f4271882cfb5f.js317ms282ms19ms1st
https://www.googletagmanager.com/gtag/js?id=G-3XZBGKFSVY248ms204ms37ms3rd
https://sensconverter.org/_next/static/chunks/aec749e8-f2c44eba138859e9.js227ms187ms14ms1st
Unattributable154ms7ms0ms1st
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
B
HTTP Caching
public, max-age=0, must-revalidate
REVIEW
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A+
Page Weight Budget
267 KB transferred, 26 requests
PASS
267 KB transferred, 26 requests
Info::
Page weighs 1.2 MB (267 KB transferred)
Info::
26 HTTP requests
Info::
Estimated 0.05 g CO2 per page load
267 KB / 2.4 MB budget
267 KB transferred
26 requests
0.05 g CO2 per page load
JavaScript 152.2 KiB 57%
Fonts 87.5 KiB 33%
HTML 17.4 KiB 7%
CSS 5.7 KiB 2%
Other 2.6 KiB 1%
Other 910 B 0%
Other 549 B 0%
Other 546 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
1% third-party, 0 ms blocking
PASS
1% third-party, 0 ms blocking
Info::
Third-party code accounts for 1% of page weight (2.1 KiB of 267.4 KiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
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+
Image Optimization
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
2 fonts (88 KB)
PASS
2 fonts (88 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

88 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.1 s LCP 3.9 shttps://sensconverter.org/_next/static/media/bb3ef058b751a6ad-s.p.woff2bb3ef058b751a6ad-s.p.woff2 https://sensconverter.org/_next/static/media/bb3ef058b751a6ad-s.p.woff2 — 39.9 KiB — 63 ms — font-display: swaphttps://sensconverter.org/_next/static/media/e4af272ccee01ff0-s.p.woff2e4af272ccee01ff0-s.p.woff2 https://sensconverter.org/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 47.6 KiB — 70 ms — font-display: swap
bb3ef058b751a6ad-s.p.woff2 woff2 swap
Size 40 KB
Load time 63 ms
Start 166 ms
Risk FOUT — text flashes from fallback to web font
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 70 ms
Start 167 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+
JS Bundles
14 scripts, 25 KB unused
PASS
14 scripts, 25 KB unused
Warning::
https://sensconverter.org/_next/static/chunks/59-5...: 25 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 25 KB
25 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://sensconverter.org/_next/static/chunks/59-548f4271882cfb5f.js50 KB25 KB (50%)✓1st
https://sensconverter.org/_next/static/chunks/main-app-56ca809ac99f47b5.js1 KB—✓1st
https://sensconverter.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 KB—✓1st
https://sensconverter.org/_next/static/chunks/webpack-81915df2aac055c1.js2 KB—✓1st
https://sensconverter.org/_next/static/chunks/aec749e8-f2c44eba138859e9.js52 KB—✓1st
https://app.pageview.app/js/script.js0 KB—✓3rd
https://www.googletagmanager.com/gtag/js?id=G-3XZBGKFSVY0 KB—✓3rd
https://sensconverter.org/_next/static/chunks/34-1d219e58e6cd95e7.js5 KB—✓1st
https://sensconverter.org/_next/static/chunks/524-adb5710f628337ae.js23 KB—✓1st
https://sensconverter.org/_next/static/chunks/app/%5Blocale%5D/layout-b1c94a85750aebca.js9 KB—✓1st

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

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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
—
preload
5
dns-prefetch
—
prefetch
—

5 resource hints configured

A+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
Document Compression
Document response uses brotli
PASS
Document response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML max-age=0 (≤ 5min) is appropriate
PASS
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: public, max-age=0, must-revalidate
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: accept-encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A+
Page Weight Inventory
26 resources · 267 KB · 25 KB savings available
PASS
26 resources · 267 KB · 25 KB savings available
Info::
Within 1MB page-weight target
Got: 267 KB
Info::
5 third-party resources (1% of weight)
26 resources · 267.4 KiB · 5 third-party Within 1MB page-weight target
JavaScript 57% · 152.2 KiB
Font 33% · 87.5 KiB
Document 7% · 17.4 KiB
CSS 2% · 5.7 KiB
Other 1% · 3.0 KiB
Image 1% · 1.7 KiB

~24.6 KiB of savings available

Remove unused JavaScript: 24.6 KiB
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
A
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
3 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
26 requests over 1620ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.1 s LCP 3.9 shttps://sensconverter.org// https://sensconverter.org/ — 200 — 16.3 KiB — 155 ms — h2https://sensconverter.org/cdn-cgi/speculation/cdn-cgi/speculation https://sensconverter.org/cdn-cgi/speculation — 200 — 483 B — 20 ms — h2https://www.googletagmanager.com/gtag/js?id=G-3XZBGKFSVYwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-3XZBGKFSVY — 200 — 0 B — 211 ms — h2https://app.pageview.app/js/script.jsapp.pageview.app/js/script.js https://app.pageview.app/js/script.js — 200 — 0 B — 3 ms — h3https://sensconverter.org/_next/static/media/bb3ef058b751a6ad-s.p.woff2/_next/static/media/bb3ef058b751a6a... https://sensconverter.org/_next/static/media/bb3ef058b751a6ad-s.p.woff2 — 200 — 39.9 KiB — 63 ms — h2https://sensconverter.org/_next/static/media/e4af272ccee01ff0-s.p.woff2/_next/static/media/e4af272ccee01ff... https://sensconverter.org/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 47.6 KiB — 70 ms — h2https://sensconverter.org/_next/static/css/6c8eafe36dc56eda.css/_next/static/css/6c8eafe36dc56eda.... https://sensconverter.org/_next/static/css/6c8eafe36dc56eda.css — 200 — 5.7 KiB — 48 ms — h2https://sensconverter.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js/cdn-cgi/scripts/5c5dd728/cloudflar... https://sensconverter.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 1.0 KiB — 39 ms — h2https://sensconverter.org/_next/static/chunks/webpack-81915df2aac055c1.js/_next/static/chunks/webpack-81915d... https://sensconverter.org/_next/static/chunks/webpack-81915df2aac055c1.js — 200 — 2.0 KiB — 29 ms — h2https://sensconverter.org/_next/static/chunks/aec749e8-f2c44eba138859e9.js/_next/static/chunks/aec749e8-f2c44... https://sensconverter.org/_next/static/chunks/aec749e8-f2c44eba138859e9.js — 200 — 52.2 KiB — 69 ms — h2https://sensconverter.org/_next/static/chunks/59-548f4271882cfb5f.js/_next/static/chunks/59-548f4271882... https://sensconverter.org/_next/static/chunks/59-548f4271882cfb5f.js — 200 — 49.7 KiB — 38 ms — h2https://sensconverter.org/_next/static/chunks/main-app-56ca809ac99f47b5.js/_next/static/chunks/main-app-56ca8... https://sensconverter.org/_next/static/chunks/main-app-56ca809ac99f47b5.js — 200 — 543 B — 50 ms — h2https://sensconverter.org/_next/static/chunks/34-1d219e58e6cd95e7.js/_next/static/chunks/34-1d219e58e6c... https://sensconverter.org/_next/static/chunks/34-1d219e58e6cd95e7.js — 200 — 5.4 KiB — 33 ms — h2https://sensconverter.org/_next/static/chunks/524-adb5710f628337ae.js/_next/static/chunks/524-adb5710f62... https://sensconverter.org/_next/static/chunks/524-adb5710f628337ae.js — 200 — 22.9 KiB — 54 ms — h2https://sensconverter.org/_next/static/chunks/app/%5Blocale%5D/layout-b1c94a85750aebca.js/_next/static/chunks/app/%5Blocale%... https://sensconverter.org/_next/static/chunks/app/%5Blocale%5D/layout-b1c94a85750aebca.js — 200 — 9.0 KiB — 67 ms — h2https://sensconverter.org/_next/static/chunks/20-4a2a1babd00b7405.js/_next/static/chunks/20-4a2a1babd00... https://sensconverter.org/_next/static/chunks/20-4a2a1babd00b7405.js — 200 — 3.8 KiB — 31 ms — h2https://sensconverter.org/_next/static/chunks/app/%5Blocale%5D/page-9fbf4ff0bfe5c843.js/_next/static/chunks/app/%5Blocale%... https://sensconverter.org/_next/static/chunks/app/%5Blocale%5D/page-9fbf4ff0bfe5c843.js — 200 — 2.7 KiB — 46 ms — h2https://sensconverter.org/_next/static/chunks/app/%5Blocale%5D/not-found-c45952ea478d11b9.js/_next/static/chunks/app/%5Blocale%... https://sensconverter.org/_next/static/chunks/app/%5Blocale%5D/not-found-c45952ea478d11b9.js — 200 — 1.9 KiB — 66 ms — h2https://sensconverter.org/site.webmanifest/site.webmanifest https://sensconverter.org/site.webmanifest — 200 — 910 B — 99 ms — h3https://sensconverter.org/icon.svg?3b8b597f9f86dc73/icon.svg?3b8b597f9f86dc73 https://sensconverter.org/icon.svg?3b8b597f9f86dc73 — 200 — 872 B — 59 ms — h3https://sensconverter.org/icon.svg/icon.svg https://sensconverter.org/icon.svg — 200 — 820 B — 52 ms — h3https://app.pageview.app/api/eventapp.pageview.app/api/event https://app.pageview.app/api/event — 202 — 546 B — 152 ms — h3https://region1.google-analytics.com/g/collect?v=2&tid=G-3XZBGKFSVY&gtm=45je6as1v9250224549za208zd9250224549xf1&_p=1793427089492&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&cid=275866728.1793427090&frm=0&ngs=1&pscdl=noapi&rcb=2&sr=412x823&uaa=&uab=64&uafvl=Not%253AA-Brand%3B8.0.0.0%7CChromium%3B156.0.8078.73&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115938466~115938468~118897920~118897930~120213116~120385422~120412528~120469145~120469153~121246026~121246034~123620776~123691370~123814945&sid=1793427089&sct=1&seg=0&dl=https%3A%2F%2Fsensconverter.org%2F&dt=Sens%20Converter%20%E2%80%94%20Free%20Mouse%20Sensitivity%20Converter&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=481region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-3XZBGKFSVY&gtm=45je6as1v9250224549za208zd9250224549xf1&_p=1793427089492&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&cid=275866728.1793427090&frm=0&ngs=1&pscdl=noapi&rcb=2&sr=412x823&uaa=&uab=64&uafvl=Not%253AA-Brand%3B8.0.0.0%7CChromium%3B156.0.8078.73&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115938466~115938468~118897920~118897930~120213116~120385422~120412528~120469145~120469153~121246026~121246034~123620776~123691370~123814945&sid=1793427089&sct=1&seg=0&dl=https%3A%2F%2Fsensconverter.org%2F&dt=Sens%20Converter%20%E2%80%94%20Free%20Mouse%20Sensitivity%20Converter&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=481 — 204 — 549 B — 85 ms — h2https://sensconverter.org/ads/native.html/ads/native.html https://sensconverter.org/ads/native.html — 308 — 533 B — 84 ms — h3https://sensconverter.org/ads/native/ads/native https://sensconverter.org/ads/native — 200 — 1.1 KiB — 78 ms — h3https://bauval.org/21/8c7fbac11fb896e84c7a9740971acd07bauval.org/21/8c7fbac11fb896e84c7a9... https://bauval.org/21/8c7fbac11fb896e84c7a9740971acd07 — 200 — 1.0 KiB — 123 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
18% of JavaScript execution is third-party
First-party Third-party 248ms · 0KB · €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 248ms
Transfer 0 KB
Monthly Cost €4/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 248ms and costs ~€4/month

Google Tag Manager takes 248ms 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

How third-party costs are calculated

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-10-02 — 2026-10-29)

LCP (p75)

972 ms

97% good

INP (p75)

43 ms

97% good

CLS (p75)

0.000

98% good

FCP (p75)

971 ms

TTFB (p75)

520 ms

This origin passes Core Web Vitals assessment
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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