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https://stelgano.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
1
REVIEW
4
PASS
10
INFO
2

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

Mobile Desktop
74
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.
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.

2.02 s

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

7.79 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.

0.008

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

2.02 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.

7.80 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
17
10 PASS 4 REVIEW 1 FIX
F
Page Weight Budget
Action
5.0 MB transferred, 24 requests
FIX
5.0 MB transferred, 24 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::
24 HTTP requests
Info::
Estimated 1.0 g CO2 per page load
5.0 MB / 2.4 MB budget
5.0 MB transferred
24 requests
1.0 g CO2 per page load
Images 4.8 MiB 96%
Fonts 191.7 KiB 4%
CSS 13.7 KiB 0%
HTML 11.5 KiB 0%
Other 11.0 KiB 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/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/contact_steg.png 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/ephemeral_identity.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
5 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

C
JS Execution Cost
Action
1365ms total JS execution
REVIEW
1365ms total JS execution
Warning::
https://stelgano.com/: 1041ms CPU time
Warning::
Unattributable: 324ms CPU time
Info::
Third-party scripts: 324ms (24% of total)

Main Thread Breakdown

Other 65% Style & Layout 25% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://stelgano.com/1041ms9ms2ms1st
Unattributable324ms7ms0ms3rd
C
Page Weight Inventory
Action
24 resources · 5.0 MB · 0 KB savings available
REVIEW
24 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::
1 third-party resources (0% of weight)
Info::
8 resources over 200KB
24 resources · 5.0 MiB · 1 third-party 4.0 MiB over 1MB target
Image 96% · 4.8 MiB
Font 4% · 191.7 KiB
CSS 0% · 13.7 KiB
Document 0% · 11.5 KiB
Other 0% · 446 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 5.0 s 6.0 s 7.0 s 8.0 s FCP 2.0 s LCP 7.8 shttps://stelgano.com/fonts/outfit-latin-400-normal.woff2outfit-latin-400-normal... https://stelgano.com/fonts/outfit-latin-400-normal.woff2 — 14.7 KiB — 71 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 — 67 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 — 74 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 — 84 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 — 71 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 — 74 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 — 87 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 — 96 ms — font-display: swaphttps://stelgano.com/fonts/outfit-latin-600-normal.woff2outfit-latin-600-normal... https://stelgano.com/fonts/outfit-latin-600-normal.woff2 — 14.8 KiB — 77 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 — 86 ms — font-display: swap
outfit-latin-400-normal... woff2 swap
Size 15 KB
Load time 71 ms
Start 260 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-800-normal... woff2 swap
Size 15 KB
Load time 67 ms
Start 260 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-700-normal... woff2 swap
Size 15 KB
Load time 74 ms
Start 260 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-600-normal.... woff2 swap
Size 25 KB
Load time 84 ms
Start 261 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-300-normal... woff2 swap
Size 15 KB
Load time 71 ms
Start 261 ms
Risk FOUT — text flashes from fallback to web font
jetbrains-mono-latin-40... woff2 swap
Size 22 KB
Load time 74 ms
Start 261 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-500-normal.... woff2 swap
Size 25 KB
Load time 87 ms
Start 261 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-400-normal.... woff2 swap
Size 24 KB
Load time 96 ms
Start 261 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-600-normal... woff2 swap
Size 15 KB
Load time 77 ms
Start 262 ms
Risk FOUT — text flashes from fallback to web font
jetbrains-mono-latin-50... woff2 swap
Size 22 KB
Load time 86 ms
Start 262 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
No JavaScript
PASS
No JavaScript
Info::
No JavaScript bundles
No JavaScript files loaded.
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+
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+
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
24 requests over 525ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 2.0 s LCP 7.8 shttps://stelgano.com// https://stelgano.com/ — 200 — 11.5 KiB — 84 ms — h2https://stelgano.com/cdn-cgi/speculation/cdn-cgi/speculation https://stelgano.com/cdn-cgi/speculation — 200 — 446 B — 22 ms — h2https://stelgano.com/assets/app.css/assets/app.css https://stelgano.com/assets/app.css — 200 — 13.7 KiB — 75 ms — h2https://stelgano.com/images/hero_visual.jpg/images/hero_visual.jpg https://stelgano.com/images/hero_visual.jpg — 200 — 235.8 KiB — 97 ms — h2https://stelgano.com/images/zero_knowledge_server.png/images/zero_knowledge_server.png https://stelgano.com/images/zero_knowledge_server.png — 200 — 905.9 KiB — 125 ms — h2https://stelgano.com/images/ephemeral_identity.png/images/ephemeral_identity.png https://stelgano.com/images/ephemeral_identity.png — 200 — 732.0 KiB — 254 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 — 252 ms — h3https://stelgano.com/images/comparison_visual.jpg/images/comparison_visual.jpg https://stelgano.com/images/comparison_visual.jpg — 200 — 296.6 KiB — 198 ms — h3https://stelgano.com/images/contact_steg.png/images/contact_steg.png https://stelgano.com/images/contact_steg.png — 200 — 408.4 KiB — 237 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 — 254 ms — h3https://stelgano.com/images/hero_illustration.png/images/hero_illustration.png https://stelgano.com/images/hero_illustration.png — 200 — 835.1 KiB — 254 ms — h3https://stelgano.com/icons.svg/icons.svg https://stelgano.com/icons.svg — 200 — 6.4 KiB — 104 ms — h3data: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 — 71 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 — 67 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 — 74 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 — 84 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 — 71 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 — 74 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 — 87 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 — 96 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 — 14.8 KiB — 77 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 — 86 ms — h3https://stelgano.com/images/favicon-96x96.png/images/favicon-96x96.png https://stelgano.com/images/favicon-96x96.png — 200 — 4.2 KiB — 48 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
24% of JavaScript execution is third-party
First-party Third-party 324ms · 0KB · $4/mo
Unattributable
Other
Costly
Execution 324ms
Transfer 0 KB
Monthly Cost $4/mo

These scripts may cost more than they're worth

  • Unattributable adds 324ms and costs ~$4/month

Unattributable takes 324ms 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

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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