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https://stelgano.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
1
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
83
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.
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.

468 ms

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

3.02 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.

0.024

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

640 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.

3.02 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
15
7 PASS 5 REVIEW 1 FIX
F
Page Weight Budget
Action
5.2 MB transferred, 23 requests
FIX
5.2 MB transferred, 23 requests
Critical::
Page weighs 5.8 MB (5.2 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::
23 HTTP requests
Info::
Estimated 1.1 g CO2 per page load
5.2 MB / 2.4 MB budget
5.2 MB transferred
23 requests
1.1 g CO2 per page load
Images 4.8 MiB 93%
JavaScript 183.9 KiB 3%
Fonts 181.8 KiB 3%
CSS 14.2 KiB 0%
HTML 12.2 KiB 0%
Other 3.2 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/hero_illustration.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.
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/hero_visual.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
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/comparison_visual.jpg 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 Bundles
1 scripts, 73 KB unused
REVIEW
1 scripts, 73 KB unused
Warning::
https://stelgano.com/assets/js/app-ffc2a27041fef30...: 73 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 73 KB
73 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://stelgano.com/assets/js/app-ffc2a27041fef307dde16d479437c9b1.js?vsn=d184 KB73 KB (40%)✓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

C
Page Weight Inventory
Action
23 resources · 5.2 MB · 73 KB savings available
REVIEW
23 resources · 5.2 MB · 73 KB savings available
Warning::
Page weight 4.2 MB over 1MB target
Got: 5.2 MB Expected: ≤ 1 MB
Info::
~73 KB of savings available
Info::
1 third-party resources (0% of weight)
Info::
8 resources over 200KB
23 resources · 5.2 MiB · 1 third-party 4.2 MiB over 1MB target
Image 93% · 4.8 MiB
JavaScript 3% · 183.9 KiB
Font 3% · 181.8 KiB
CSS 0% · 14.2 KiB
Document 0% · 12.2 KiB

~73.1 KiB of savings available

Remove unused JavaScript: 73.1 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0, private, must-revalidate
REVIEW
max-age=0, private, must-revalidate
Info::
Cache-Control header is set
Got: max-age=0, private, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, private, must-revalidate

DirectiveValueMeaning
max-age0Cache for 0 seconds
private—Only browser cache, not CDN/proxy
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+
JS Execution Cost
426ms total JS execution
PASS
426ms total JS execution
Info::
https://stelgano.com/: 199ms CPU time
Info::
Unattributable: 173ms CPU time
Info::
https://stelgano.com/assets/js/app-ffc2a27041fef30...: 54ms CPU time
Info::
Third-party scripts: 173ms (41% of total)

Main Thread Breakdown

Other 64% Style & Layout 20% Script Evaluation 7% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://stelgano.com/199ms2ms0ms1st
Unattributable173ms2ms0ms3rd
https://stelgano.com/assets/js/app-ffc2a27041fef307dde16d479437c9b1.js?vsn=d54ms24ms19ms1st
A+
Font Loading
10 fonts (182 KB)
PASS
10 fonts (182 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

182 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 FCP 468 ms LCP 3.0 shttps://stelgano.com/fonts/outfit-latin-400-normal-23191c444b9e40528bdfc989d29560ea.woff2?vsn=doutfit-latin-400-normal... https://stelgano.com/fonts/outfit-latin-400-normal-23191c444b9e40528bdfc989d29560ea.woff2?vsn=d — 13.8 KiB — 127 ms — font-display: swaphttps://stelgano.com/fonts/outfit-latin-800-normal-900f0bbe1debca0dad4c7cadca56b83f.woff2?vsn=doutfit-latin-800-normal... https://stelgano.com/fonts/outfit-latin-800-normal-900f0bbe1debca0dad4c7cadca56b83f.woff2?vsn=d — 13.8 KiB — 127 ms — font-display: swaphttps://stelgano.com/fonts/inter-latin-600-normal-2ede57db1a3a5f41f40467e7a43a1dd4.woff2?vsn=dinter-latin-600-normal-... https://stelgano.com/fonts/inter-latin-600-normal-2ede57db1a3a5f41f40467e7a43a1dd4.woff2?vsn=d — 23.9 KiB — 126 ms — font-display: swaphttps://stelgano.com/fonts/outfit-latin-700-normal-6a0674c3b77b4d6c7d0a423c59740655.woff2?vsn=doutfit-latin-700-normal... https://stelgano.com/fonts/outfit-latin-700-normal-6a0674c3b77b4d6c7d0a423c59740655.woff2?vsn=d — 13.8 KiB — 126 ms — font-display: swaphttps://stelgano.com/fonts/outfit-latin-300-normal-9b74615df5869c028b578a3d7911189f.woff2?vsn=doutfit-latin-300-normal... https://stelgano.com/fonts/outfit-latin-300-normal-9b74615df5869c028b578a3d7911189f.woff2?vsn=d — 13.7 KiB — 127 ms — font-display: swaphttps://stelgano.com/fonts/jetbrains-mono-latin-400-normal-caf0dfde4e448468f09b7bed230206a4.woff2?vsn=djetbrains-mono-latin-40... https://stelgano.com/fonts/jetbrains-mono-latin-400-normal-caf0dfde4e448468f09b7bed230206a4.woff2?vsn=d — 20.7 KiB — 127 ms — font-display: swaphttps://stelgano.com/fonts/inter-latin-500-normal-51205681a1ba304816fc629e8989256b.woff2?vsn=dinter-latin-500-normal-... https://stelgano.com/fonts/inter-latin-500-normal-51205681a1ba304816fc629e8989256b.woff2?vsn=d — 23.8 KiB — 126 ms — font-display: swaphttps://stelgano.com/fonts/inter-latin-400-normal-da03732a27e16543f09d6a6a62b0cdd4.woff2?vsn=dinter-latin-400-normal-... https://stelgano.com/fonts/inter-latin-400-normal-da03732a27e16543f09d6a6a62b0cdd4.woff2?vsn=d — 23.2 KiB — 127 ms — font-display: swaphttps://stelgano.com/fonts/outfit-latin-600-normal-778dd8bec372ecd5ecef5c36da616fc6.woff2?vsn=doutfit-latin-600-normal... https://stelgano.com/fonts/outfit-latin-600-normal-778dd8bec372ecd5ecef5c36da616fc6.woff2?vsn=d — 13.9 KiB — 127 ms — font-display: swaphttps://stelgano.com/fonts/jetbrains-mono-latin-500-normal-a21e038a03f709cf60aa1e2944048aef.woff2?vsn=djetbrains-mono-latin-50... https://stelgano.com/fonts/jetbrains-mono-latin-500-normal-a21e038a03f709cf60aa1e2944048aef.woff2?vsn=d — 21.4 KiB — 127 ms — font-display: swap
outfit-latin-400-normal... woff2 swap
Size 14 KB
Load time 127 ms
Start 309 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-800-normal... woff2 swap
Size 14 KB
Load time 127 ms
Start 309 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-600-normal-... woff2 swap
Size 24 KB
Load time 126 ms
Start 310 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-700-normal... woff2 swap
Size 14 KB
Load time 126 ms
Start 310 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-300-normal... woff2 swap
Size 14 KB
Load time 127 ms
Start 311 ms
Risk FOUT — text flashes from fallback to web font
jetbrains-mono-latin-40... woff2 swap
Size 21 KB
Load time 127 ms
Start 311 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-500-normal-... woff2 swap
Size 24 KB
Load time 126 ms
Start 311 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-400-normal-... woff2 swap
Size 23 KB
Load time 127 ms
Start 311 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-600-normal... woff2 swap
Size 14 KB
Load time 127 ms
Start 311 ms
Risk FOUT — text flashes from fallback to web font
jetbrains-mono-latin-50... woff2 swap
Size 21 KB
Load time 127 ms
Start 312 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+
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
Network Waterfall
23 requests over 584ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 468 ms LCP 3.0 shttps://stelgano.com// https://stelgano.com/ — 200 — 12.2 KiB — 128 ms — h2https://stelgano.com/assets/css/app-c6f775b31ab8fa97e0c8e92fda28e495.css?vsn=d/assets/css/app-c6f775b31ab8fa97e0c... https://stelgano.com/assets/css/app-c6f775b31ab8fa97e0c8e92fda28e495.css?vsn=d — 200 — 14.2 KiB — 103 ms — h2https://stelgano.com/assets/js/app-ffc2a27041fef307dde16d479437c9b1.js?vsn=d/assets/js/app-ffc2a27041fef307dde1... https://stelgano.com/assets/js/app-ffc2a27041fef307dde16d479437c9b1.js?vsn=d — 200 — 183.9 KiB — 132 ms — h2https://stelgano.com/images/hero_visual.jpg/images/hero_visual.jpg https://stelgano.com/images/hero_visual.jpg — 200 — 235.5 KiB — 154 ms — h2https://stelgano.com/images/zero_knowledge_server.png/images/zero_knowledge_server.png https://stelgano.com/images/zero_knowledge_server.png — 200 — 905.2 KiB — 188 ms — h2https://stelgano.com/images/ephemeral_identity.png/images/ephemeral_identity.png https://stelgano.com/images/ephemeral_identity.png — 200 — 731.3 KiB — 176 ms — h2https://stelgano.com/images/client_side_crypto.png/images/client_side_crypto.png https://stelgano.com/images/client_side_crypto.png — 200 — 721.4 KiB — 174 ms — h2https://stelgano.com/images/comparison_visual.jpg/images/comparison_visual.jpg https://stelgano.com/images/comparison_visual.jpg — 200 — 295.7 KiB — 147 ms — h2https://stelgano.com/images/contact_steg.png/images/contact_steg.png https://stelgano.com/images/contact_steg.png — 200 — 407.5 KiB — 160 ms — h2https://stelgano.com/images/n_equals_1.png/images/n_equals_1.png https://stelgano.com/images/n_equals_1.png — 200 — 750.3 KiB — 181 ms — h2https://stelgano.com/images/hero_illustration.png/images/hero_illustration.png https://stelgano.com/images/hero_illustration.png — 200 — 834.4 KiB — 200 ms — h2data: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-23191c444b9e40528bdfc989d29560ea.woff2?vsn=d/fonts/outfit-latin-400-normal-2319... https://stelgano.com/fonts/outfit-latin-400-normal-23191c444b9e40528bdfc989d29560ea.woff2?vsn=d — 200 — 13.8 KiB — 127 ms — h2https://stelgano.com/fonts/outfit-latin-800-normal-900f0bbe1debca0dad4c7cadca56b83f.woff2?vsn=d/fonts/outfit-latin-800-normal-900f... https://stelgano.com/fonts/outfit-latin-800-normal-900f0bbe1debca0dad4c7cadca56b83f.woff2?vsn=d — 200 — 13.8 KiB — 127 ms — h2https://stelgano.com/fonts/inter-latin-600-normal-2ede57db1a3a5f41f40467e7a43a1dd4.woff2?vsn=d/fonts/inter-latin-600-normal-2ede5... https://stelgano.com/fonts/inter-latin-600-normal-2ede57db1a3a5f41f40467e7a43a1dd4.woff2?vsn=d — 200 — 23.9 KiB — 126 ms — h2https://stelgano.com/fonts/outfit-latin-700-normal-6a0674c3b77b4d6c7d0a423c59740655.woff2?vsn=d/fonts/outfit-latin-700-normal-6a06... https://stelgano.com/fonts/outfit-latin-700-normal-6a0674c3b77b4d6c7d0a423c59740655.woff2?vsn=d — 200 — 13.8 KiB — 126 ms — h2https://stelgano.com/fonts/outfit-latin-300-normal-9b74615df5869c028b578a3d7911189f.woff2?vsn=d/fonts/outfit-latin-300-normal-9b74... https://stelgano.com/fonts/outfit-latin-300-normal-9b74615df5869c028b578a3d7911189f.woff2?vsn=d — 200 — 13.7 KiB — 127 ms — h2https://stelgano.com/fonts/jetbrains-mono-latin-400-normal-caf0dfde4e448468f09b7bed230206a4.woff2?vsn=d/fonts/jetbrains-mono-latin-400-nor... https://stelgano.com/fonts/jetbrains-mono-latin-400-normal-caf0dfde4e448468f09b7bed230206a4.woff2?vsn=d — 200 — 20.7 KiB — 127 ms — h2https://stelgano.com/fonts/inter-latin-500-normal-51205681a1ba304816fc629e8989256b.woff2?vsn=d/fonts/inter-latin-500-normal-51205... https://stelgano.com/fonts/inter-latin-500-normal-51205681a1ba304816fc629e8989256b.woff2?vsn=d — 200 — 23.8 KiB — 126 ms — h2https://stelgano.com/fonts/inter-latin-400-normal-da03732a27e16543f09d6a6a62b0cdd4.woff2?vsn=d/fonts/inter-latin-400-normal-da037... https://stelgano.com/fonts/inter-latin-400-normal-da03732a27e16543f09d6a6a62b0cdd4.woff2?vsn=d — 200 — 23.2 KiB — 127 ms — h2https://stelgano.com/fonts/outfit-latin-600-normal-778dd8bec372ecd5ecef5c36da616fc6.woff2?vsn=d/fonts/outfit-latin-600-normal-778d... https://stelgano.com/fonts/outfit-latin-600-normal-778dd8bec372ecd5ecef5c36da616fc6.woff2?vsn=d — 200 — 13.9 KiB — 127 ms — h2https://stelgano.com/fonts/jetbrains-mono-latin-500-normal-a21e038a03f709cf60aa1e2944048aef.woff2?vsn=d/fonts/jetbrains-mono-latin-500-nor... https://stelgano.com/fonts/jetbrains-mono-latin-500-normal-a21e038a03f709cf60aa1e2944048aef.woff2?vsn=d — 200 — 21.4 KiB — 127 ms — h2https://stelgano.com/images/favicon-96x96.png/images/favicon-96x96.png https://stelgano.com/images/favicon-96x96.png — 200 — 3.2 KiB — 35 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
41% of JavaScript execution is third-party
First-party Third-party 173ms · 0KB · $2/mo
Unattributable
Other
Optional
Execution 173ms
Transfer 0 KB
Monthly Cost $2/mo

41% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

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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