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https://r3webdesign.de

Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
94
GRADE
A
FIX
1
REVIEW
6
PASS
16
INFO
3

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

Mobile Desktop
99
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.
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.

1.58 s

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

1.70 s

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

34 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.005

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

3.00 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.

1.72 s

Page Load Progression

384 ms
768 ms
1.2 s
1.5 s
1.9 s
2.3 s
2.7 s
3.1 s
Checks
26
16 PASS 6 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
Image Optimization
6 images, 0 KB saveable
REVIEW
6 images, 0 KB saveable
Info::
All images are well-optimized
6 images 21 KB
0 oversized -0 KB
6 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1658ms total JS execution
REVIEW
1658ms total JS execution
Warning::
https://r3webdesign.de/: 1378ms CPU time
Warning::
Unattributable: 280ms CPU time

Main Thread Breakdown

Style & Layout 50% Other 33% Rendering 10% Parse HTML & CSS 3% Script Evaluation 3%
ScriptTotalScriptingParse/CompileParty
https://r3webdesign.de/1378ms24ms6ms1st
Unattributable280ms27ms0ms1st
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
137 KB transferred, 15 requests
PASS
137 KB transferred, 15 requests
Info::
Page weighs 315 KB (137 KB transferred)
Info::
15 HTTP requests
Info::
Estimated 0.03 g CO2 per page load
137 KB / 2.4 MB budget
137 KB transferred
15 requests
0.03 g CO2 per page load
Fonts 60.3 KiB 44%
HTML 49.9 KiB 36%
Images 21.1 KiB 15%
Other 2.6 KiB 2%
JavaScript 2.5 KiB 2%
Other 445 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+
Font Loading
2 fonts (60 KB)
PASS
2 fonts (60 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

60 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 500 ms 1.0 s 1.5 s FCP 1.6 s LCP 1.7 shttps://r3webdesign.de/_astro/inter-latin-wght-normal.Dx4kXJAl.woff2inter-latin-wght-normal... https://r3webdesign.de/_astro/inter-latin-wght-normal.Dx4kXJAl.woff2 — 47.3 KiB — 205 ms — font-display: swaphttps://r3webdesign.de/_astro/architects-daughter-latin-400-normal.DOGE_9Aw.woff2architects-daughter-lat... https://r3webdesign.de/_astro/architects-daughter-latin-400-normal.DOGE_9Aw.woff2 — 13.0 KiB — 202 ms — font-display: swap
inter-latin-wght-normal... woff2 swap
Size 47 KB
Load time 205 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
architects-daughter-lat... woff2 swap
Size 13 KB
Load time 202 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
4 scripts, 0 KB unused
PASS
4 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://r3webdesign.de/_astro/page.CDGqskMv.js1 KB—✓1st
https://r3webdesign.de/site-effects.js1 KB—✓1st
https://r3webdesign.de/_astro/index.astro_astro_type_script_index_1_lang.ewlBtr1L.js0 KB—✓1st
https://r3webdesign.de/_astro/carousel.Bz7Clw4a.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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
—
prefetch
—

1 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+
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
15 resources · 137 KB · 0 KB savings available
PASS
15 resources · 137 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 137 KB
15 resources · 137.0 KiB · 0 third-party Within 1MB page-weight target
Font 44% · 60.3 KiB
Document 36% · 49.9 KiB
Image 17% · 23.8 KiB
JavaScript 2% · 2.5 KiB
Other 0% · 445 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
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
15 requests over 2158ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.6 s LCP 1.7 shttps://r3webdesign.de// https://r3webdesign.de/ — 200 — 49.9 KiB — 1.3 s — h2https://r3webdesign.de/_astro/inter-latin-wght-normal.Dx4kXJAl.woff2/_astro/inter-latin-wght-normal.Dx4... https://r3webdesign.de/_astro/inter-latin-wght-normal.Dx4kXJAl.woff2 — 200 — 47.3 KiB — 205 ms — h2https://r3webdesign.de/_astro/page.CDGqskMv.js/_astro/page.CDGqskMv.js https://r3webdesign.de/_astro/page.CDGqskMv.js — 200 — 1.1 KiB — 203 ms — h2https://r3webdesign.de/logo-mark-dark.svg/logo-mark-dark.svg https://r3webdesign.de/logo-mark-dark.svg — 200 — 3.7 KiB — 202 ms — h2https://r3webdesign.de/sketch/corner-tl.svg/sketch/corner-tl.svg https://r3webdesign.de/sketch/corner-tl.svg — 200 — 2.6 KiB — 373 ms — h2https://r3webdesign.de/sketch/corner-tr.svg/sketch/corner-tr.svg https://r3webdesign.de/sketch/corner-tr.svg — 200 — 5.2 KiB — 375 ms — h2https://r3webdesign.de/sketch/corner-bl.svg/sketch/corner-bl.svg https://r3webdesign.de/sketch/corner-bl.svg — 200 — 1.2 KiB — 198 ms — h2https://r3webdesign.de/sketch/corner-br.svg/sketch/corner-br.svg https://r3webdesign.de/sketch/corner-br.svg — 200 — 1.5 KiB — 199 ms — h2https://r3webdesign.de/sketch/hero-logo.svg/sketch/hero-logo.svg https://r3webdesign.de/sketch/hero-logo.svg — 200 — 7.0 KiB — 365 ms — h2https://r3webdesign.de/site-effects.js/site-effects.js https://r3webdesign.de/site-effects.js — 200 — 572 B — 365 ms — h2https://r3webdesign.de/_astro/index.astro_astro_type_script_index_1_lang.ewlBtr1L.js/_astro/index.astro_astro_type_scri... https://r3webdesign.de/_astro/index.astro_astro_type_script_index_1_lang.ewlBtr1L.js — 200 — 93 B — 367 ms — h2https://r3webdesign.de/site.webmanifest/site.webmanifest https://r3webdesign.de/site.webmanifest — 200 — 445 B — 394 ms — h3https://r3webdesign.de/_astro/architects-daughter-latin-400-normal.DOGE_9Aw.woff2/_astro/architects-daughter-latin-4... https://r3webdesign.de/_astro/architects-daughter-latin-400-normal.DOGE_9Aw.woff2 — 200 — 13.0 KiB — 202 ms — h3https://r3webdesign.de/_astro/carousel.Bz7Clw4a.js/_astro/carousel.Bz7Clw4a.js https://r3webdesign.de/_astro/carousel.Bz7Clw4a.js — 200 — 760 B — 200 ms — h3https://r3webdesign.de/favicon.ico/favicon.ico https://r3webdesign.de/favicon.ico — 200 — 2.6 KiB — 198 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
15 images, 28 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

15

Total Size

28 KB

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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