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https://math-kit.pages.dev

Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
1
REVIEW
4
PASS
18
INFO
3

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

Mobile Desktop
93
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

945 ms

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

1.61 s

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

316 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.

945 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.

4.60 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
26
18 PASS 4 REVIEW 1 FIX
D
Third-Party Impact
Action
61% third-party, 0 ms blocking
FIX
61% third-party, 0 ms blocking
Warning::
Third-party code accounts for 61% of page weight (254.3 KiB of 418.9 KiB)
Info::
Third-party blocking time is low (0 ms)
39%
61%
First-party Third-party
C
JS Execution Cost
Action
1092ms total JS execution
REVIEW
1092ms total JS execution
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7CVV...: 333ms CPU time
Warning::
https://nap5k.com/tag.min.js: 287ms CPU time
Info::
https://math-kit.pages.dev/: 164ms CPU time
Info::
Unattributable: 162ms CPU time
Info::
https://math-kit.pages.dev/_astro/client.3KfiIzy5....: 81ms CPU time
Warning::
Third-party scripts: 684ms (63% of total)

Main Thread Breakdown

Script Evaluation 67% Other 17% Style & Layout 7% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtag/js?id=G-7CVV9WMFET333ms291ms37ms3rd
https://nap5k.com/tag.min.js287ms268ms10ms3rd
https://math-kit.pages.dev/164ms48ms5ms1st
Unattributable162ms16ms0ms1st
https://math-kit.pages.dev/_astro/client.3KfiIzy5.js81ms73ms0ms1st
https://static.cloudflareinsights.com/beacon.min.js64ms46ms4ms3rd
B
JS Bundles
10 scripts, 132 KB unused
REVIEW
10 scripts, 132 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7CVV...: 73 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://math-kit.pages.dev/_astro/client.3KfiIzy5....: 34 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://nap5k.com/tag.min.js: 25 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 132 KB
132 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-7CVV9WMFET178 KB73 KB (41%)✓3rd
https://math-kit.pages.dev/_astro/client.3KfiIzy5.js66 KB34 KB (52%)✓1st
https://nap5k.com/tag.min.js64 KB25 KB (40%)✓3rd
https://static.cloudflareinsights.com/beacon.min.js10 KB—✓3rd
https://math-kit.pages.dev/_astro/LiveSearch.BXbjaPt5.js1 KB—✓1st
https://math-kit.pages.dev/_astro/ThemeToggle.BZbGTRGI.js2 KB—✓1st
https://math-kit.pages.dev/_astro/MobileNav.C5xFqA13.js2 KB—✓1st
https://math-kit.pages.dev/_astro/react.yIOJJ3r4.js5 KB—✓1st
https://math-kit.pages.dev/_astro/jsx-runtime.DvU585tb.js2 KB—✓1st
https://math-kit.pages.dev/_astro/LiveSearch.C-7xtf-6.js12 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

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

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
419 KB transferred, 23 requests
PASS
419 KB transferred, 23 requests
Info::
Page weighs 1.1 MB (419 KB transferred)
Info::
23 HTTP requests
Info::
Estimated 0.09 g CO2 per page load
419 KB / 2.4 MB budget
419 KB transferred
23 requests
0.09 g CO2 per page load
JavaScript 341.7 KiB 82%
Fonts 47.5 KiB 11%
HTML 11.1 KiB 3%
CSS 8.1 KiB 2%
Other 6.7 KiB 2%
Other 1.8 KiB 0%
Other 1.1 KiB 0%
Other 551 B 0%
Images 408 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
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
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 0 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
1 fonts (48 KB)
PASS
1 fonts (48 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

48 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 945 ms LCP 1.6 shttps://math-kit.pages.dev/fonts/inter-var-latin.woff2inter-var-latin.woff2 https://math-kit.pages.dev/fonts/inter-var-latin.woff2 — 47.5 KiB — 60 ms — font-display: swap
inter-var-latin.woff2 woff2 swap
Size 48 KB
Load time 60 ms
Start 104 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
2
preload
1
dns-prefetch
—
prefetch
—

3 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
23 resources · 419 KB · 132 KB savings available
PASS
23 resources · 419 KB · 132 KB savings available
Info::
Within 1MB page-weight target
Got: 419 KB
Info::
~132 KB of savings available
Warning::
10 third-party resources (61% of weight)
23 resources · 418.9 KiB · 10 third-party Within 1MB page-weight target
JavaScript 82% · 341.7 KiB
Font 11% · 47.5 KiB
Document 3% · 11.1 KiB
Other 2% · 8.4 KiB
CSS 2% · 8.1 KiB
Image 1% · 2.2 KiB

~132.1 KiB of savings available

Remove unused JavaScript: 132.1 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
No render-blocking JS or document.write usage detected
PASS
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
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
23 requests over 614ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 945 ms LCP 1.6 shttps://math-kit.pages.dev// https://math-kit.pages.dev/ — 200 — 11.1 KiB — 92 ms — h2https://nap5k.com/tag.min.jsnap5k.com/tag.min.js https://nap5k.com/tag.min.js — 200 — 63.8 KiB — 154 ms — h3https://math-kit.pages.dev/fonts/inter-var-latin.woff2/fonts/inter-var-latin.woff2 https://math-kit.pages.dev/fonts/inter-var-latin.woff2 — 200 — 47.5 KiB — 60 ms — h2https://math-kit.pages.dev/_astro/Layout.25I-2_K_.css/_astro/Layout.25I-2_K_.css https://math-kit.pages.dev/_astro/Layout.25I-2_K_.css — 200 — 8.1 KiB — 47 ms — h2https://www.googletagmanager.com/gtag/js?id=G-7CVV9WMFETwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-7CVV9WMFET — 200 — 177.8 KiB — 171 ms — h2https://static.cloudflareinsights.com/beacon.min.jsstatic.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js — 200 — 10.2 KiB — 90 ms — h2https://math-kit.pages.dev/_astro/LiveSearch.BXbjaPt5.js/_astro/LiveSearch.BXbjaPt5.js https://math-kit.pages.dev/_astro/LiveSearch.BXbjaPt5.js — 200 — 1.4 KiB — 64 ms — h3https://math-kit.pages.dev/_astro/client.3KfiIzy5.js/_astro/client.3KfiIzy5.js https://math-kit.pages.dev/_astro/client.3KfiIzy5.js — 200 — 66.1 KiB — 64 ms — h3https://math-kit.pages.dev/_astro/ThemeToggle.BZbGTRGI.js/_astro/ThemeToggle.BZbGTRGI.js https://math-kit.pages.dev/_astro/ThemeToggle.BZbGTRGI.js — 200 — 2.1 KiB — 51 ms — h3https://math-kit.pages.dev/_astro/MobileNav.C5xFqA13.js/_astro/MobileNav.C5xFqA13.js https://math-kit.pages.dev/_astro/MobileNav.C5xFqA13.js — 200 — 2.4 KiB — 82 ms — h3https://math-kit.pages.dev/_astro/react.yIOJJ3r4.js/_astro/react.yIOJJ3r4.js https://math-kit.pages.dev/_astro/react.yIOJJ3r4.js — 200 — 4.6 KiB — 29 ms — h3https://math-kit.pages.dev/_astro/jsx-runtime.DvU585tb.js/_astro/jsx-runtime.DvU585tb.js https://math-kit.pages.dev/_astro/jsx-runtime.DvU585tb.js — 200 — 1.6 KiB — 33 ms — h3https://math-kit.pages.dev/_astro/LiveSearch.C-7xtf-6.js/_astro/LiveSearch.C-7xtf-6.js https://math-kit.pages.dev/_astro/LiveSearch.C-7xtf-6.js — 200 — 11.8 KiB — 31 ms — h3https://math-kit.pages.dev/search-index.json/search-index.json https://math-kit.pages.dev/search-index.json — 200 — 4.9 KiB — 62 ms — h3https://math-kit.pages.dev/search-index.json/search-index.json https://math-kit.pages.dev/search-index.json — 200 — 1.3 KiB — 87 ms — h3https://my.rtmark.net/gid.jsmy.rtmark.net/gid.js https://my.rtmark.net/gid.js — 200 — 503 B — 84 ms — h3https://region1.analytics.google.com/g/collect?v=2&tid=G-7CVV9WMFET&gtm=45je6as1v9267014166za208zd9267014166xf1&_p=1793350493681&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&cid=538471511.1793350494&frm=0&pscdl=noapi&rcb=7&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&gaf=2&_s=1&tag_exp=115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121246026~121246034~123691370&sid=1793350493&sct=1&seg=0&dl=https%3A%2F%2Fmath-kit.pages.dev%2F&dt=Free%20Online%20Math%20Calculators%20%26%20Tables%20%7C%20MathKit&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=404region1.analytics.google.com/g/coll... https://region1.analytics.google.com/g/collect?v=2&tid=G-7CVV9WMFET&gtm=45je6as1v9267014166za208zd9267014166xf1&_p=1793350493681&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&cid=538471511.1793350494&frm=0&pscdl=noapi&rcb=7&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&gaf=2&_s=1&tag_exp=115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121246026~121246034~123691370&sid=1793350493&sct=1&seg=0&dl=https%3A%2F%2Fmath-kit.pages.dev%2F&dt=Free%20Online%20Math%20Calculators%20%26%20Tables%20%7C%20MathKit&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=404 — 204 — 551 B — 87 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-7CVV9WMFET&cid=538471511.1793350494&gtm=45je6as1v9267014166za208zd9267014166xf1&rcb=7&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121246026~121246034~123691370stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-7CVV9WMFET&cid=538471511.1793350494&gtm=45je6as1v9267014166za208zd9267014166xf1&rcb=7&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121246026~121246034~123691370 — 204 — 551 B — 91 ms — h2https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-7CVV9WMFET&cid=538471511.1793350494&gtm=45je6as1v9267014166za208zd9267014166xf1&rcb=7&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121246026~121246034~123691370&z=1034042383www.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-7CVV9WMFET&cid=538471511.1793350494&gtm=45je6as1v9267014166za208zd9267014166xf1&rcb=7&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121246026~121246034~123691370&z=1034042383 — 200 — 408 B — 94 ms — h2https://jhnwr.com/400/12151775?oo=1&sw_version=v1.967.0-s&oaid=0803dfbf7ba948caf10649e64ba50ee3&st=truejhnwr.com/400/12151775?oo=1&sw_vers... https://jhnwr.com/400/12151775?oo=1&sw_version=v1.967.0-s&oaid=0803dfbf7ba948caf10649e64ba50ee3&st=true — 204 — 594 B — 116 ms — h2https://cloudflareinsights.com/cdn-cgi/rumcloudflareinsights.com/cdn-cgi/rum https://cloudflareinsights.com/cdn-cgi/rum — 200 — 0 B — 86 ms — h2https://math-kit.pages.dev/favicon.svg/favicon.svg https://math-kit.pages.dev/favicon.svg — 200 — 1.8 KiB — 30 ms — h3https://cloudflareinsights.com/cdn-cgi/rumcloudflareinsights.com/cdn-cgi/rum https://cloudflareinsights.com/cdn-cgi/rum — 204 — 35 B — 21 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
63% of JavaScript execution is third-party
First-party Third-party 684ms · 252KB · €11/mo
Google Tag Manager
Tag Manager
Costly
Execution 333ms
Transfer 178 KB
Unused 41%
Monthly Cost €5/mo
nap5k.com
Other
Costly
Execution 287ms
Transfer 64 KB
Unused 40%
Monthly Cost €5/mo
static.cloudflareinsights.com
Other
Optional
Execution 64ms
Transfer 10 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 333ms and costs ~€5/month
  • nap5k.com adds 287ms and costs ~€5/month

63% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Google Tag Manager takes 333ms 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

nap5k.com takes 287ms 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

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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