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https://erhoeremich.de

Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
95
GRADE
A
FIX
1
REVIEW
5
PASS
17
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.
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.
92
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.

1.11 s

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

3.21 s

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.

0.011

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

2.26 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.

3.21 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
17 PASS 5 REVIEW 1 FIX
D
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.
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present

No Cache-Control header

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

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document 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
474 KB transferred, 12 requests
PASS
474 KB transferred, 12 requests
Info::
Page weighs 597 KB (474 KB transferred)
Info::
12 HTTP requests
Info::
Estimated 0.10 g CO2 per page load
474 KB / 2.4 MB budget
474 KB transferred
12 requests
0.10 g CO2 per page load
Images 349.9 KiB 74%
Fonts 87.3 KiB 18%
CSS 20.0 KiB 4%
HTML 10.6 KiB 2%
JavaScript 4.7 KiB 1%
Other 1.9 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-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
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 350 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
298ms total JS execution
PASS
298ms total JS execution
Info::
Unattributable: 171ms CPU time
Info::
https://erhoeremich.de/js/background-blur.min.605b...: 70ms CPU time
Info::
https://erhoeremich.de/: 56ms CPU time

Main Thread Breakdown

Other 55% Style & Layout 25% Script Evaluation 9% Parse HTML & CSS 7%
ScriptTotalScriptingParse/CompileParty
Unattributable171ms5ms0ms1st
https://erhoeremich.de/js/background-blur.min.605b3b942818f0ab5a717ae446135ec46b8ee5a2ad12ae56fb90dc2a76ce30c388f9fec8bcc18db15bd47e3fa8a09d779fa12aa9c184cf614a315bc72c6c163d.js70ms5ms1ms1st
https://erhoeremich.de/56ms8ms2ms1st
A+
Font Loading
1 fonts (87 KB)
PASS
1 fonts (87 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

87 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 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 3.2 shttps://erhoeremich.de/fonts/nasalization/nasalization-rg.otfnasalization-rg.otf https://erhoeremich.de/fonts/nasalization/nasalization-rg.otf — 87.3 KiB — 37 ms — font-display: swap
nasalization-rg.otf otf swap
Size 87 KB
Load time 37 ms
Start 644 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~26 KB and ~52 ms

A+
JS Bundles
4 scripts, 0 KB unused
PASS
4 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://erhoeremich.de/js/appearance.min.6f41174b3a05b680820fe08cadbfa5fb7a7ca347b76a0955cdc68b9d8aca1ce24f0547e138cea33bcc7904d551a90afcb1cc7f2d9fe8557075d501419046c08c.js1 KB—✓1st
https://erhoeremich.de/lib/zoom/zoom.min.umd.a527109b68c082a70f3697716dd72a9d5aa8b545cf800cecbbc7399f2ca6f6e0ce3e431f2062b48bbfa47c9ea42822714060bef309be073f49b9c0e30d318d7b.js3 KB—✓1st
https://erhoeremich.de/js/background-blur.min.605b3b942818f0ab5a717ae446135ec46b8ee5a2ad12ae56fb90dc2a76ce30c388f9fec8bcc18db15bd47e3fa8a09d779fa12aa9c184cf614a315bc72c6c163d.js1 KB—✓1st
https://erhoeremich.de/js/main.bundle.min.6f9e49850a316ceb9908ad4b153b391e55b41bbcee8b408b52410567544eeebe6776aa57d770d75952dc164e6071068a848bdc5cb48c4dbaef04d65b3f442667.js1 KB—✓1st
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+
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::
Both `ETag` and `Last-Modified` present -- efficient revalidation supported
The page returns both `ETag` (content hash) and `Last-Modified` (timestamp) headers. Browsers can issue conditional GETs with `If-None-Match` or `If-Modified-Since`; the server returns 304 Not Modified for unchanged content, saving bandwidth. ETag is the more reliable of the two (timestamps fail in DST transitions and clock skew).
A+
Page Weight Inventory
12 resources · 474 KB · 0 KB savings available
PASS
12 resources · 474 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 474 KB
Info::
1 resources over 200KB
12 resources · 474.4 KiB · 0 third-party Within 1MB page-weight target
Image 74% · 351.8 KiB
Font 18% · 87.3 KiB
CSS 4% · 20.0 KiB
Document 2% · 10.6 KiB
JavaScript 1% · 4.7 KiB
Other 0% · 0 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
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
4 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
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
12 requests over 724ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 3.2 shttps://erhoeremich.de// https://erhoeremich.de/ — 200 — 10.6 KiB — 446 ms — h2https://erhoeremich.de/css/main.bundle.min.a3901ad9a4a22181e90e750c3513dcb1f7178bf53d71750df5d4067d438d48f7f302830dbac6c719382ac436ec59dfe97156a798aa0d985695cbd303bd2d639a.css/css/main.bundle.min.a3901ad9a4a221... https://erhoeremich.de/css/main.bundle.min.a3901ad9a4a22181e90e750c3513dcb1f7178bf53d71750df5d4067d438d48f7f302830dbac6c719382ac436ec59dfe97156a798aa0d985695cbd303bd2d639a.css — 200 — 19.7 KiB — 138 ms — h2https://erhoeremich.de/js/appearance.min.6f41174b3a05b680820fe08cadbfa5fb7a7ca347b76a0955cdc68b9d8aca1ce24f0547e138cea33bcc7904d551a90afcb1cc7f2d9fe8557075d501419046c08c.js/js/appearance.min.6f41174b3a05b680... https://erhoeremich.de/js/appearance.min.6f41174b3a05b680820fe08cadbfa5fb7a7ca347b76a0955cdc68b9d8aca1ce24f0547e138cea33bcc7904d551a90afcb1cc7f2d9fe8557075d501419046c08c.js — 200 — 858 B — 36 ms — h2https://erhoeremich.de/lib/zoom/zoom.min.umd.a527109b68c082a70f3697716dd72a9d5aa8b545cf800cecbbc7399f2ca6f6e0ce3e431f2062b48bbfa47c9ea42822714060bef309be073f49b9c0e30d318d7b.js/lib/zoom/zoom.min.umd.a527109b68c0... https://erhoeremich.de/lib/zoom/zoom.min.umd.a527109b68c082a70f3697716dd72a9d5aa8b545cf800cecbbc7399f2ca6f6e0ce3e431f2062b48bbfa47c9ea42822714060bef309be073f49b9c0e30d318d7b.js — 200 — 2.8 KiB — 136 ms — h2https://erhoeremich.de/css/secure-players.min.f21c15d9513f3c74b6d9220669ea8b0ecd524727af3e3b712a391361452d6626.css/css/secure-players.min.f21c15d9513... https://erhoeremich.de/css/secure-players.min.f21c15d9513f3c74b6d9220669ea8b0ecd524727af3e3b712a391361452d6626.css — 200 — 357 B — 36 ms — h2https://erhoeremich.de/img/logo.png/img/logo.png https://erhoeremich.de/img/logo.png — 200 — 349.9 KiB — 133 ms — h2https://erhoeremich.de/js/background-blur.min.605b3b942818f0ab5a717ae446135ec46b8ee5a2ad12ae56fb90dc2a76ce30c388f9fec8bcc18db15bd47e3fa8a09d779fa12aa9c184cf614a315bc72c6c163d.js/js/background-blur.min.605b3b94281... https://erhoeremich.de/js/background-blur.min.605b3b942818f0ab5a717ae446135ec46b8ee5a2ad12ae56fb90dc2a76ce30c388f9fec8bcc18db15bd47e3fa8a09d779fa12aa9c184cf614a315bc72c6c163d.js — 200 — 535 B — 136 ms — h2https://erhoeremich.de/js/main.bundle.min.6f9e49850a316ceb9908ad4b153b391e55b41bbcee8b408b52410567544eeebe6776aa57d770d75952dc164e6071068a848bdc5cb48c4dbaef04d65b3f442667.js/js/main.bundle.min.6f9e49850a316ce... https://erhoeremich.de/js/main.bundle.min.6f9e49850a316ceb9908ad4b153b391e55b41bbcee8b408b52410567544eeebe6776aa57d770d75952dc164e6071068a848bdc5cb48c4dbaef04d65b3f442667.js — 200 — 581 B — 35 ms — h2https://erhoeremich.de/fonts/nasalization/nasalization-rg.otf/fonts/nasalization/nasalization-rg... https://erhoeremich.de/fonts/nasalization/nasalization-rg.otf — 200 — 87.3 KiB — 37 ms — h2https://erhoeremich.de/site.webmanifest/site.webmanifest https://erhoeremich.de/site.webmanifest — -1 — 0 B — 0 ms — https://erhoeremich.de/site.webmanifest/site.webmanifest https://erhoeremich.de/site.webmanifest — -1 — 0 B — 0 ms — https://erhoeremich.de/favicon-32x32.png/favicon-32x32.png https://erhoeremich.de/favicon-32x32.png — 200 — 1.9 KiB — 36 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
2 images, 699 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

2

Total Size

699 KB

1 missing alt text 1 missing dimensions
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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