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https://math-kit.pages.dev

Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
94
GRADE
A
FIX
0
REVIEW
4
PASS
15
INFO
3

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.
92
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.

456 ms

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

666 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.

456 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.

666 ms

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
22
15 PASS 4 REVIEW
B
Third-Party Impact
53% third-party, 0 ms blocking
REVIEW
53% third-party, 0 ms blocking
Warning::
Third-party code accounts for 53% of page weight (189.5 KiB of 355.5 KiB)
Info::
Third-party blocking time is low (0 ms)
47%
53%
First-party Third-party
B
JS Bundles
9 scripts, 107 KB unused
REVIEW
9 scripts, 107 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.
Info::
Total unused JavaScript: 107 KB
107 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://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

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
355 KB transferred, 20 requests
PASS
355 KB transferred, 20 requests
Info::
Page weighs 979 KB (355 KB transferred)
Info::
20 HTTP requests
Info::
Estimated 0.07 g CO2 per page load
355 KB / 2.4 MB budget
355 KB transferred
20 requests
0.07 g CO2 per page load
JavaScript 277.6 KiB 78%
Fonts 48.4 KiB 14%
HTML 11.2 KiB 3%
CSS 9.0 KiB 3%
Other 6.5 KiB 2%
Other 1.7 KiB 0%
Other 560 B 0%
Images 408 B 0%
Other 35 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+
JS Execution Cost
67ms total JS execution
PASS
67ms total JS execution
Info::
https://www.googletagmanager.com/gtag/js?id=G-7CVV...: 67ms CPU time
Warning::
Third-party scripts: 67ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Other 24% Style & Layout 12% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtag/js?id=G-7CVV9WMFET67ms57ms9ms3rd
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 FCP 456 ms LCP 666 mshttps://math-kit.pages.dev/fonts/inter-var-latin.woff2inter-var-latin.woff2 https://math-kit.pages.dev/fonts/inter-var-latin.woff2 — 48.4 KiB — 52 ms — font-display: swap
inter-var-latin.woff2 woff2 swap
Size 48 KB
Load time 52 ms
Start 125 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
20 resources · 355 KB · 107 KB savings available
PASS
20 resources · 355 KB · 107 KB savings available
Info::
Within 1MB page-weight target
Got: 355 KB
Info::
~107 KB of savings available
Warning::
7 third-party resources (53% of weight)
20 resources · 355.5 KiB · 7 third-party Within 1MB page-weight target
JavaScript 78% · 277.6 KiB
Font 14% · 48.4 KiB
Document 3% · 11.2 KiB
CSS 3% · 9.0 KiB
Other 2% · 7.1 KiB
Image 1% · 2.1 KiB

~106.9 KiB of savings available

Remove unused JavaScript: 106.9 KiB
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
20 requests over 543ms
INFO
0 ms 200 ms 400 ms 600 ms FCP 456 ms LCP 666 mshttps://math-kit.pages.dev// https://math-kit.pages.dev/ — 200 — 11.2 KiB — 116 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 — 48.4 KiB — 52 ms — h3https://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 — 172 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 — 9.0 KiB — 46 ms — h3https://static.cloudflareinsights.com/beacon.min.jsstatic.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js — 200 — 10.2 KiB — 69 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 — 65 ms — h3https://math-kit.pages.dev/_astro/client.3KfiIzy5.js/_astro/client.3KfiIzy5.js https://math-kit.pages.dev/_astro/client.3KfiIzy5.js — 200 — 66.0 KiB — 84 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 — 54 ms — h3https://math-kit.pages.dev/_astro/MobileNav.C5xFqA13.js/_astro/MobileNav.C5xFqA13.js https://math-kit.pages.dev/_astro/MobileNav.C5xFqA13.js — 200 — 2.3 KiB — 36 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 — 67 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 — 76 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 — 11.7 KiB — 42 ms — h3https://math-kit.pages.dev/search-index.json/search-index.json https://math-kit.pages.dev/search-index.json — 200 — 4.7 KiB — 35 ms — h3https://math-kit.pages.dev/search-index.json/search-index.json https://math-kit.pages.dev/search-index.json — 200 — 1.2 KiB — 60 ms — h3https://region1.analytics.google.com/g/collect?v=2&tid=G-7CVV9WMFET&gtm=45je6as0h1v9267014166za208zd9267014166xf1&_p=1793298136689&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&cid=676999639.1793298137&frm=0&pscdl=noapi&rcb=10&sr=800x600&uaa=x86&uab=64&uafvl=Not%253AA-Brand%3B8.0.0.0%7CChromium%3B156.0.8078.73&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121246026~121246034~123691369&sid=1793298136&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=377region1.analytics.google.com/g/coll... https://region1.analytics.google.com/g/collect?v=2&tid=G-7CVV9WMFET&gtm=45je6as0h1v9267014166za208zd9267014166xf1&_p=1793298136689&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&cid=676999639.1793298137&frm=0&pscdl=noapi&rcb=10&sr=800x600&uaa=x86&uab=64&uafvl=Not%253AA-Brand%3B8.0.0.0%7CChromium%3B156.0.8078.73&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121246026~121246034~123691369&sid=1793298136&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=377 — 204 — 551 B — 69 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-7CVV9WMFET&cid=676999639.1793298137&gtm=45je6as0h1v9267014166za208zd9267014166xf1&rcb=10&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121246026~121246034~123691369stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-7CVV9WMFET&cid=676999639.1793298137&gtm=45je6as0h1v9267014166za208zd9267014166xf1&rcb=10&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121246026~121246034~123691369 — 204 — 560 B — 71 ms — h2https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-7CVV9WMFET&cid=676999639.1793298137&gtm=45je6as0h1v9267014166za208zd9267014166xf1&rcb=10&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121246026~121246034~123691369&z=881396192www.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=676999639.1793298137&gtm=45je6as0h1v9267014166za208zd9267014166xf1&rcb=10&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121246026~121246034~123691369&z=881396192 — 200 — 408 B — 69 ms — h2https://cloudflareinsights.com/cdn-cgi/rumcloudflareinsights.com/cdn-cgi/rum https://cloudflareinsights.com/cdn-cgi/rum — 200 — 0 B — 59 ms — h2https://math-kit.pages.dev/favicon.svg/favicon.svg https://math-kit.pages.dev/favicon.svg — 200 — 1.7 KiB — 33 ms — h3https://cloudflareinsights.com/cdn-cgi/rumcloudflareinsights.com/cdn-cgi/rum https://cloudflareinsights.com/cdn-cgi/rum — 204 — 35 B — 27 ms — h2
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 67ms · 178KB · €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 67ms
Transfer 178 KB
Unused 41%
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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