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https://tomdawayhet.com

Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
3
REVIEW
4
PASS
16
INFO
3

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

Mobile Desktop
89
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.

2.44 s

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

3.04 s

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

2 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.

3.91 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.

3.14 s

Page Load Progression

408 ms
817 ms
1.2 s
1.6 s
2.0 s
2.5 s
2.9 s
3.3 s
Checks
26
16 PASS 4 REVIEW 3 FIX
D
Third-Party Impact
Action
89% third-party, 0 ms blocking
FIX
89% third-party, 0 ms blocking
Warning::
Third-party code accounts for 89% of page weight (656.8 KiB of 735.2 KiB)
Info::
Third-party blocking time is low (0 ms)
89%
First-party Third-party
D
JS Execution Cost
Action
2743ms total JS execution
FIX
2743ms total JS execution
Warning::
https://tomdawayhet.com/: 2136ms CPU time
Warning::
Unattributable: 309ms CPU time
Info::
https://js.tomdawayhet.com/main.js?457829d75764ad1...: 245ms CPU time
Info::
https://tomdawayhet.com/css/: 53ms CPU time
Info::
Third-party scripts: 245ms (9% of total)

Main Thread Breakdown

Other 61% Style & Layout 26% Rendering 6% Script Evaluation 5%
ScriptTotalScriptingParse/CompileParty
https://tomdawayhet.com/2136ms8ms1ms1st
Unattributable309ms7ms0ms1st
https://js.tomdawayhet.com/main.js?457829d75764ad1319710cc6fce18d75245ms131ms2ms3rd
https://tomdawayhet.com/css/53ms0ms0ms1st
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
Compression Algorithm
Main response uses gzip; brotli would be ~20% smaller
REVIEW
Main response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
735 KB transferred, 17 requests
PASS
735 KB transferred, 17 requests
Info::
Page weighs 1.4 MB (735 KB transferred)
Info::
17 HTTP requests
Info::
Estimated 0.15 g CO2 per page load
735 KB / 2.4 MB budget
735 KB transferred
17 requests
0.15 g CO2 per page load
Images 484.2 KiB 66%
Fonts 160.0 KiB 22%
CSS 70.7 KiB 10%
Other 9.4 KiB 1%
HTML 7.3 KiB 1%
JavaScript 2.9 KiB 0%
Other 630 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
6 images, 0 KB saveable
PASS
6 images, 0 KB saveable
Info::
All images are well-optimized
6 images 484 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
4 fonts (160 KB)
PASS
4 fonts (160 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

160 KB total

Render-blocking

0

of 4

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 FCP 2.4 s LCP 3.0 shttps://fonts.tomdawayhet.com/mluvka/Mluvka-Bold-web.woff2Mluvka-Bold-web.woff2 https://fonts.tomdawayhet.com/mluvka/Mluvka-Bold-web.woff2 — 40.2 KiB — 518 ms — font-display: swaphttps://fonts.tomdawayhet.com/mluvka/Mluvka-Medium-web.woff2Mluvka-Medium-web.woff2 https://fonts.tomdawayhet.com/mluvka/Mluvka-Medium-web.woff2 — 39.8 KiB — 514 ms — font-display: swaphttps://fonts.tomdawayhet.com/mluvka/Mluvka-Regular-web.woff2Mluvka-Regular-web.woff2 https://fonts.tomdawayhet.com/mluvka/Mluvka-Regular-web.woff2 — 39.8 KiB — 685 ms — font-display: swaphttps://fonts.tomdawayhet.com/mluvka/Mluvka-SemiBold-web.woff2Mluvka-SemiBold-web.woff2 https://fonts.tomdawayhet.com/mluvka/Mluvka-SemiBold-web.woff2 — 40.2 KiB — 685 ms — font-display: swap
Mluvka-Bold-web.woff2 woff2 swap
Size 40 KB
Load time 518 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
Mluvka-Medium-web.woff2 woff2 swap
Size 40 KB
Load time 514 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
Mluvka-Regular-web.woff2 woff2 swap
Size 40 KB
Load time 685 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
Mluvka-SemiBold-web.woff2 woff2 swap
Size 40 KB
Load time 685 ms
Start 1.6 s
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
1 scripts, 0 KB unused
PASS
1 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://js.tomdawayhet.com/main.js?457829d75764ad1319710cc6fce18d753 KB—✓3rd
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+
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+
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
17 resources · 735 KB · 0 KB savings available
PASS
17 resources · 735 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 735 KB
Warning::
14 third-party resources (89% of weight)
17 resources · 735.2 KiB · 14 third-party Within 1MB page-weight target
Image 67% · 493.6 KiB
Font 22% · 160.0 KiB
CSS 10% · 70.7 KiB
Document 1% · 7.3 KiB
JavaScript 0% · 2.9 KiB
Other 0% · 630 B
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
Network Waterfall
17 requests over 2584ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.4 s LCP 3.0 shttps://tomdawayhet.com// https://tomdawayhet.com/ — 200 — 7.3 KiB — 644 ms — h2https://fonts.tomdawayhet.com/mluvka/font.cssfonts.tomdawayhet.com/mluvka/font.c... https://fonts.tomdawayhet.com/mluvka/font.css — 200 — 316 B — 885 ms — h2https://tomdawayhet.com/css//css/ https://tomdawayhet.com/css/ — 200 — 70.4 KiB — 531 ms — h2https://audio.tomdawayhet.com/releases/call-it-funky.mp3audio.tomdawayhet.com/releases/call... https://audio.tomdawayhet.com/releases/call-it-funky.mp3 — 200 — 3.8 KiB — 551 ms — h2https://js.tomdawayhet.com/main.js?457829d75764ad1319710cc6fce18d75js.tomdawayhet.com/main.js?457829d7... https://js.tomdawayhet.com/main.js?457829d75764ad1319710cc6fce18d75 — 200 — 2.9 KiB — 907 ms — h2https://tomdawayhet.com/site.webmanifest/site.webmanifest https://tomdawayhet.com/site.webmanifest — 200 — 630 B — 363 ms — h3https://img.tomdawayhet.com/tom-da-wayhet-portrait.webpimg.tomdawayhet.com/tom-da-wayhet-p... https://img.tomdawayhet.com/tom-da-wayhet-portrait.webp — 200 — 41.9 KiB — 260 ms — h2https://img.tomdawayhet.com/releases/call-it-funky.webpimg.tomdawayhet.com/releases/call-i... https://img.tomdawayhet.com/releases/call-it-funky.webp — 200 — 92.9 KiB — 224 ms — h2https://img.tomdawayhet.com/releases/alien-salsa.webpimg.tomdawayhet.com/releases/alien-... https://img.tomdawayhet.com/releases/alien-salsa.webp — 200 — 155.2 KiB — 283 ms — h2https://img.tomdawayhet.com/releases/run.webpimg.tomdawayhet.com/releases/run.we... https://img.tomdawayhet.com/releases/run.webp — 200 — 71.1 KiB — 235 ms — h2https://img.tomdawayhet.com/releases/summer-trip.webpimg.tomdawayhet.com/releases/summer... https://img.tomdawayhet.com/releases/summer-trip.webp — 200 — 119.3 KiB — 257 ms — h2https://fonts.tomdawayhet.com/mluvka/Mluvka-Bold-web.woff2fonts.tomdawayhet.com/mluvka/Mluvka... https://fonts.tomdawayhet.com/mluvka/Mluvka-Bold-web.woff2 — 200 — 40.2 KiB — 518 ms — h3https://fonts.tomdawayhet.com/mluvka/Mluvka-Medium-web.woff2fonts.tomdawayhet.com/mluvka/Mluvka... https://fonts.tomdawayhet.com/mluvka/Mluvka-Medium-web.woff2 — 200 — 39.8 KiB — 514 ms — h3https://fonts.tomdawayhet.com/mluvka/Mluvka-Regular-web.woff2fonts.tomdawayhet.com/mluvka/Mluvka... https://fonts.tomdawayhet.com/mluvka/Mluvka-Regular-web.woff2 — 200 — 39.8 KiB — 685 ms — h3https://fonts.tomdawayhet.com/mluvka/Mluvka-SemiBold-web.woff2fonts.tomdawayhet.com/mluvka/Mluvka... https://fonts.tomdawayhet.com/mluvka/Mluvka-SemiBold-web.woff2 — 200 — 40.2 KiB — 685 ms — h3https://icons.tomdawayhet.com/favicon-light.svg?457829d75764ad1319710cc6fce18d75icons.tomdawayhet.com/favicon-light... https://icons.tomdawayhet.com/favicon-light.svg?457829d75764ad1319710cc6fce18d75 — 200 — 528 B — 258 ms — h2https://icons.tomdawayhet.com/favicon-192x192.pngicons.tomdawayhet.com/favicon-192x1... https://icons.tomdawayhet.com/favicon-192x192.png — 200 — 8.9 KiB — 252 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
9% of JavaScript execution is third-party
First-party Third-party 245ms · 3KB · €1/mo
js.tomdawayhet.com
Other
Costly
Execution 245ms
Transfer 3 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • js.tomdawayhet.com adds 245ms and costs ~€1/month

js.tomdawayhet.com takes 245ms 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

Image Optimization
5 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

5

Total Size

0 KB

5 missing dimensions 1 missing lazy loading
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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