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https://stelgano.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
1
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
79
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
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.

716 ms

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

4.10 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.

0.007

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

905 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.

4.18 s

Page Load Progression

394 ms
788 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.2 s
Checks
15
8 PASS 4 REVIEW 1 FIX
F
Page Weight Budget
Action
5.0 MB transferred, 25 requests
FIX
5.0 MB transferred, 25 requests
Critical::
Page weighs 5.1 MB (5.0 MB transferred)
Warning::
Images are 4.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.8 MB
Info::
25 HTTP requests
Info::
Estimated 1.0 g CO2 per page load
5.0 MB / 2.4 MB budget
5.0 MB transferred
25 requests
1.0 g CO2 per page load
Images 4.8 MiB 96%
Fonts 191.7 KiB 4%
CSS 14.9 KiB 0%
HTML 12.0 KiB 0%
Other 11.3 KiB 0%
JavaScript 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

C
Image Optimization
Action
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Warning::
https://stelgano.com/images/zero_knowledge_server.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://stelgano.com/images/contact_steg.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://stelgano.com/images/hero_visual.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://stelgano.com/images/ephemeral_identity.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://stelgano.com/images/client_side_crypto.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://stelgano.com/images/comparison_visual.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://stelgano.com/images/n_equals_1.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://stelgano.com/images/hero_illustration.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
9 images 4.8 MB
0 oversized -0 KB
8 legacy format
8 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

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

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

B
JS Execution Cost
715ms total JS execution
REVIEW
715ms total JS execution
Warning::
https://stelgano.com/: 532ms CPU time
Info::
Unattributable: 183ms CPU time
Info::
Third-party scripts: 183ms (26% of total)

Main Thread Breakdown

Other 73% Style & Layout 21%
ScriptTotalScriptingParse/CompileParty
https://stelgano.com/532ms4ms1ms1st
Unattributable183ms3ms0ms3rd
C
Page Weight Inventory
Action
25 resources · 5.0 MB · 0 KB savings available
REVIEW
25 resources · 5.0 MB · 0 KB savings available
Warning::
Page weight 4.0 MB over 1MB target
Got: 5.0 MB Expected: ≤ 1 MB
Info::
2 third-party resources (0% of weight)
Info::
8 resources over 200KB
25 resources · 5.0 MiB · 2 third-party 4.0 MiB over 1MB target
Image 96% · 4.8 MiB
Font 4% · 191.7 KiB
CSS 0% · 14.9 KiB
Document 0% · 12.0 KiB
Other 0% · 559 B
JavaScript 0% · 0 B
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+
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
10 fonts (192 KB)
PASS
10 fonts (192 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

192 KB total

Render-blocking

0

of 10

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 4.0 s FCP 716 ms LCP 4.1 shttps://stelgano.com/fonts/outfit-latin-400-normal.woff2outfit-latin-400-normal... https://stelgano.com/fonts/outfit-latin-400-normal.woff2 — 14.7 KiB — 80 ms — font-display: swaphttps://stelgano.com/fonts/outfit-latin-800-normal.woff2outfit-latin-800-normal... https://stelgano.com/fonts/outfit-latin-800-normal.woff2 — 14.8 KiB — 81 ms — font-display: swaphttps://stelgano.com/fonts/inter-latin-600-normal.woff2inter-latin-600-normal.... https://stelgano.com/fonts/inter-latin-600-normal.woff2 — 24.9 KiB — 94 ms — font-display: swaphttps://stelgano.com/fonts/outfit-latin-700-normal.woff2outfit-latin-700-normal... https://stelgano.com/fonts/outfit-latin-700-normal.woff2 — 14.8 KiB — 86 ms — font-display: swaphttps://stelgano.com/fonts/outfit-latin-300-normal.woff2outfit-latin-300-normal... https://stelgano.com/fonts/outfit-latin-300-normal.woff2 — 14.7 KiB — 80 ms — font-display: swaphttps://stelgano.com/fonts/jetbrains-mono-latin-400-normal.woff2jetbrains-mono-latin-40... https://stelgano.com/fonts/jetbrains-mono-latin-400-normal.woff2 — 21.7 KiB — 90 ms — font-display: swaphttps://stelgano.com/fonts/inter-latin-500-normal.woff2inter-latin-500-normal.... https://stelgano.com/fonts/inter-latin-500-normal.woff2 — 24.7 KiB — 92 ms — font-display: swaphttps://stelgano.com/fonts/inter-latin-400-normal.woff2inter-latin-400-normal.... https://stelgano.com/fonts/inter-latin-400-normal.woff2 — 24.2 KiB — 94 ms — font-display: swaphttps://stelgano.com/fonts/outfit-latin-600-normal.woff2outfit-latin-600-normal... https://stelgano.com/fonts/outfit-latin-600-normal.woff2 — 14.9 KiB — 87 ms — font-display: swaphttps://stelgano.com/fonts/jetbrains-mono-latin-500-normal.woff2jetbrains-mono-latin-50... https://stelgano.com/fonts/jetbrains-mono-latin-500-normal.woff2 — 22.4 KiB — 91 ms — font-display: swap
outfit-latin-400-normal... woff2 swap
Size 15 KB
Load time 80 ms
Start 308 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-800-normal... woff2 swap
Size 15 KB
Load time 81 ms
Start 309 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-600-normal.... woff2 swap
Size 25 KB
Load time 94 ms
Start 310 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-700-normal... woff2 swap
Size 15 KB
Load time 86 ms
Start 310 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-300-normal... woff2 swap
Size 15 KB
Load time 80 ms
Start 311 ms
Risk FOUT — text flashes from fallback to web font
jetbrains-mono-latin-40... woff2 swap
Size 22 KB
Load time 90 ms
Start 312 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-500-normal.... woff2 swap
Size 25 KB
Load time 92 ms
Start 313 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-400-normal.... woff2 swap
Size 24 KB
Load time 94 ms
Start 313 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-600-normal... woff2 swap
Size 15 KB
Load time 87 ms
Start 314 ms
Risk FOUT — text flashes from fallback to web font
jetbrains-mono-latin-50... woff2 swap
Size 22 KB
Load time 91 ms
Start 314 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 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://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da17715231245160 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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
25 requests over 828ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 716 ms LCP 4.1 shttps://stelgano.com// https://stelgano.com/ — 200 — 12.0 KiB — 110 ms — h3https://stelgano.com/cdn-cgi/speculation/cdn-cgi/speculation https://stelgano.com/cdn-cgi/speculation — 200 — 559 B — 9 ms — h3https://stelgano.com/assets/app.css/assets/app.css https://stelgano.com/assets/app.css — 200 — 14.9 KiB — 32 ms — h3https://stelgano.com/images/hero_visual.jpg/images/hero_visual.jpg https://stelgano.com/images/hero_visual.jpg — 200 — 236.4 KiB — 71 ms — h3https://stelgano.com/images/zero_knowledge_server.png/images/zero_knowledge_server.png https://stelgano.com/images/zero_knowledge_server.png — 200 — 905.8 KiB — 475 ms — h3https://stelgano.com/images/ephemeral_identity.png/images/ephemeral_identity.png https://stelgano.com/images/ephemeral_identity.png — 200 — 732.0 KiB — 457 ms — h3https://stelgano.com/images/client_side_crypto.png/images/client_side_crypto.png https://stelgano.com/images/client_side_crypto.png — 200 — 722.1 KiB — 439 ms — h3https://stelgano.com/images/comparison_visual.jpg/images/comparison_visual.jpg https://stelgano.com/images/comparison_visual.jpg — 200 — 296.6 KiB — 271 ms — h3https://stelgano.com/images/contact_steg.png/images/contact_steg.png https://stelgano.com/images/contact_steg.png — 200 — 408.4 KiB — 331 ms — h3https://stelgano.com/images/n_equals_1.png/images/n_equals_1.png https://stelgano.com/images/n_equals_1.png — 200 — 751.0 KiB — 456 ms — h3https://stelgano.com/images/hero_illustration.png/images/hero_illustration.png https://stelgano.com/images/hero_illustration.png — 200 — 835.1 KiB — 468 ms — h3https://stelgano.com/icons.svg/icons.svg https://stelgano.com/icons.svg — 200 — 6.6 KiB — 37 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — -1 — 0 B — 0 ms — data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='…www.w3.org/2000/svg'%3E%3Cfilter id... data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='… — 200 — 0 B — 0 ms — datahttps://stelgano.com/fonts/outfit-latin-400-normal.woff2/fonts/outfit-latin-400-normal.woff... https://stelgano.com/fonts/outfit-latin-400-normal.woff2 — 200 — 14.7 KiB — 80 ms — h3https://stelgano.com/fonts/outfit-latin-800-normal.woff2/fonts/outfit-latin-800-normal.woff... https://stelgano.com/fonts/outfit-latin-800-normal.woff2 — 200 — 14.8 KiB — 81 ms — h3https://stelgano.com/fonts/inter-latin-600-normal.woff2/fonts/inter-latin-600-normal.woff2 https://stelgano.com/fonts/inter-latin-600-normal.woff2 — 200 — 24.9 KiB — 94 ms — h3https://stelgano.com/fonts/outfit-latin-700-normal.woff2/fonts/outfit-latin-700-normal.woff... https://stelgano.com/fonts/outfit-latin-700-normal.woff2 — 200 — 14.8 KiB — 86 ms — h3https://stelgano.com/fonts/outfit-latin-300-normal.woff2/fonts/outfit-latin-300-normal.woff... https://stelgano.com/fonts/outfit-latin-300-normal.woff2 — 200 — 14.7 KiB — 80 ms — h3https://stelgano.com/fonts/jetbrains-mono-latin-400-normal.woff2/fonts/jetbrains-mono-latin-400-nor... https://stelgano.com/fonts/jetbrains-mono-latin-400-normal.woff2 — 200 — 21.7 KiB — 90 ms — h3https://stelgano.com/fonts/inter-latin-500-normal.woff2/fonts/inter-latin-500-normal.woff2 https://stelgano.com/fonts/inter-latin-500-normal.woff2 — 200 — 24.7 KiB — 92 ms — h3https://stelgano.com/fonts/inter-latin-400-normal.woff2/fonts/inter-latin-400-normal.woff2 https://stelgano.com/fonts/inter-latin-400-normal.woff2 — 200 — 24.2 KiB — 94 ms — h3https://stelgano.com/fonts/outfit-latin-600-normal.woff2/fonts/outfit-latin-600-normal.woff... https://stelgano.com/fonts/outfit-latin-600-normal.woff2 — 200 — 14.9 KiB — 87 ms — h3https://stelgano.com/fonts/jetbrains-mono-latin-500-normal.woff2/fonts/jetbrains-mono-latin-500-nor... https://stelgano.com/fonts/jetbrains-mono-latin-500-normal.woff2 — 200 — 22.4 KiB — 91 ms — h3https://stelgano.com/images/favicon-96x96.png/images/favicon-96x96.png https://stelgano.com/images/favicon-96x96.png — 200 — 4.2 KiB — 28 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
26% of JavaScript execution is third-party
First-party Third-party 183ms · 0KB · €2/mo
Unattributable
Other
Optional
Execution 183ms
Transfer 0 KB
Monthly Cost €2/mo

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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