https://artistikath.de
Performance
· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
93
GRADE
A
FIX
1
REVIEW
4
PASS
14
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
99
98
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
466 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
466 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.
1.21 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.
466 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 sChecks
2214 PASS 4 REVIEW 1 FIX
FHTTP CachingActionNo cache headersFIX
HTTP Caching
ActionNo cache headers
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.
BPage Weight Budget1.1 MB transferred, 29 requestsREVIEW
Page Weight Budget
1.1 MB transferred, 29 requests
1.1 MB transferred, 29 requests
Info::
Page weighs 1.5 MB (1.1 MB transferred)
Info::
29 HTTP requests
Info::
Estimated 0.23 g CO2 per page load
1.1 MB transferred
29 requests
0.23 g CO2 per page load
Images 901.0 KiB 79%
JavaScript 141.2 KiB 12%
Fonts 73.4 KiB 6%
Other 9.8 KiB 1%
CSS 9.2 KiB 1%
HTML 4.7 KiB 0%
Other 518 B 0%
0 2.4 MB 4.9 MB
Under budget
CDocument CompressionActionDocument response served uncompressedREVIEW
Document Compression
ActionDocument response served uncompressed
Document response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
Main HTML Cache-Control
No Cache-Control header on main HTML response
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.
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
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.
A+Third-Party Impact1% third-party, 0 ms blockingPASS
Third-Party Impact
1% third-party, 0 ms blocking
1% third-party, 0 ms blocking
Info::
Third-party code accounts for 1% of page weight (6.8 KiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
AImage Optimization4 images, 0 KB saveablePASS
Image Optimization
4 images, 0 KB saveable
4 images, 0 KB saveable
Warning::
https://artistikath.de/media/artworks/21/01.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://artistikath.de/media/artworks/20/01.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://artistikath.de/media/artworks/19/01.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
4 images 901 KB
0 oversized -0 KB
0 legacy format
3 missing dimensions CLS risk
Set explicit width and height to prevent CLS.
Why this matters
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Why this matters
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Why this matters
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
A+JS Execution Cost195ms total JS executionPASS
JS Execution Cost
195ms total JS execution
195ms total JS execution
Info::
https://artistikath.de/assets/index-BujYFSjo.js: 73ms CPU time
Info::
https://artistikath.de/de: 64ms CPU time
Info::
Unattributable: 58ms CPU time
Main Thread Breakdown
Other 41% Script Evaluation 36% Style & Layout 17% Rendering 3%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://artistikath.de/assets/index-BujYFSjo.js | 73ms | 65ms | 1ms | 1st |
| https://artistikath.de/de | 64ms | 3ms | 1ms | 1st |
| Unattributable | 58ms | 2ms | 0ms | 1st |
A+Font Loading2 fonts (73 KB)PASS
Font Loading
2 fonts (73 KB)
2 fonts (73 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
73 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
Outfit-Variable.woff2 woff2 swap
Size 39 KB
Load time 380 ms
Start 467 ms
Risk FOUT — text flashes from fallback to web font
Syne-Latin.woff2 woff2 swap
Size 34 KB
Load time 91 ms
Start 467 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+JS Bundles16 scripts, 35 KB unusedPASS
JS Bundles
16 scripts, 35 KB unused
16 scripts, 35 KB unused
Warning::
https://artistikath.de/assets/index-BujYFSjo.js: 35 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 35 KB
35 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://artistikath.de/assets/index-BujYFSjo.js | 83 KB | 35 KB (42%) | ✓ | 1st |
| https://artistikath.de/assets/copy-CMD8sCJW.js | 15 KB | — | ✓ | 1st |
| https://artistikath.de/assets/react-dom-CvqTzanH.js | 1 KB | — | ✓ | 1st |
| https://artistikath.de/assets/utils-DojpP95n.js | 7 KB | — | ✓ | 1st |
| https://artistikath.de/assets/dist-rYY0ay2T.js | 0 KB | — | ✓ | 1st |
| https://artistikath.de/assets/live-Bc8Si8dI.js | 9 KB | — | ✓ | 1st |
| https://artistikath.de/assets/shop-CyUW0-SS.js | 2 KB | — | ✓ | 1st |
| https://artistikath.de/assets/_lang-e6gF4uQi.js | 2 KB | — | ✓ | 1st |
| https://artistikath.de/assets/Cart-DhXyaMvV.js | 12 KB | — | ✓ | 1st |
| https://artistikath.de/assets/separator-B63DBMa4.js | 0 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
A+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
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 PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Server Response Intelligence1 server-response signal(s) detectedPASS
Server Response Intelligence
1 server-response signal(s) detected
1 server-response signal(s) detected
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.
APage Weight Inventory29 resources · 1.1 MB · 35 KB savings availablePASS
Page Weight Inventory
29 resources · 1.1 MB · 35 KB savings available
29 resources · 1.1 MB · 35 KB savings available
Warning::
Page weight 1.1 MB exceeds 1 MB target by 116 KB
Got: 1.1 MB Expected: ≤ 1 MB
Info::
2 third-party resources (1% of weight)
Info::
1 resources over 200KB
29 resources · 1.1 MiB · 2 third-party 115.8 KiB over 1MB target
Image 80% · 910.3 KiB
JavaScript 12% · 141.2 KiB
Font 6% · 73.4 KiB
CSS 1% · 9.2 KiB
Document 0% · 4.7 KiB
Other 0% · 1.0 KiB
~35.2 KiB of savings available
Remove unused JavaScript: 35.2 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 29 resources | 1.1 MiB | ||||||
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Hetzner Online GmbH
Asset CompressionNo text asset hosts to measureINFO
Asset Compression
No text asset hosts to measure
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 Waterfall29 requests over 1253msINFO
Network Waterfall
29 requests over 1253ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization4 images, 900 KB total, 829 KB wastedINFO
Image Optimization
4 images, 900 KB total, 829 KB wasted
Image Optimization Audit
Total Images
4
Total Size
900 KB
Oversized
4
Wasted
829 KB
3 missing dimensions 2 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.