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https://stelgano.com

Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
1
REVIEW
5
PASS
17
INFO
2

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

Mobile Desktop
76
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.

1.10 s

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

7.03 s

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

19 ms

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

0.010

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

1.11 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.

7.04 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
25
17 PASS 5 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 95%
Fonts 192.2 KiB 4%
CSS 14.7 KiB 0%
HTML 13.1 KiB 0%
Other 11.2 KiB 0%
Other 1013 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/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.
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.
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
1201ms total JS execution
REVIEW
1201ms total JS execution
Warning::
https://stelgano.com/: 821ms CPU time
Warning::
Unattributable: 380ms CPU time

Main Thread Breakdown

Other 61% Style & Layout 29% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://stelgano.com/821ms11ms3ms1st
Unattributable380ms7ms0ms1st
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
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 5.0 MB exceeds 1 MB target by 4.0 MB
Got: 5.0 MB Expected: ≤ 1 MB
Info::
1 third-party resources (0% of weight)
Info::
8 resources over 200KB
25 resources · 5.0 MiB · 1 third-party 4.0 MiB over 1MB target
Image 96% · 4.8 MiB
Font 4% · 192.2 KiB
CSS 0% · 14.7 KiB
Document 0% · 13.1 KiB
Other 0% · 1.5 KiB
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 FCP 1.1 s LCP 7.0 shttps://stelgano.com/fonts/outfit-latin-400-normal.woff2outfit-latin-400-normal... https://stelgano.com/fonts/outfit-latin-400-normal.woff2 — 14.8 KiB — 86 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 — 89 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 — 90 ms — font-display: swaphttps://stelgano.com/fonts/inter-latin-600-normal.woff2inter-latin-600-normal.... https://stelgano.com/fonts/inter-latin-600-normal.woff2 — 25.0 KiB — 102 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 — 90 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 — 21.8 KiB — 99 ms — font-display: swaphttps://stelgano.com/fonts/inter-latin-500-normal.woff2inter-latin-500-normal.... https://stelgano.com/fonts/inter-latin-500-normal.woff2 — 24.8 KiB — 100 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 — 102 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 — 89 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 — 99 ms — font-display: swap
outfit-latin-400-normal... woff2 swap
Size 15 KB
Load time 86 ms
Start 198 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-800-normal... woff2 swap
Size 15 KB
Load time 89 ms
Start 199 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-700-normal... woff2 swap
Size 15 KB
Load time 90 ms
Start 199 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-600-normal.... woff2 swap
Size 25 KB
Load time 102 ms
Start 199 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-300-normal... woff2 swap
Size 15 KB
Load time 90 ms
Start 199 ms
Risk FOUT — text flashes from fallback to web font
jetbrains-mono-latin-40... woff2 swap
Size 22 KB
Load time 99 ms
Start 199 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-500-normal.... woff2 swap
Size 25 KB
Load time 100 ms
Start 200 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-400-normal.... woff2 swap
Size 24 KB
Load time 102 ms
Start 200 ms
Risk FOUT — text flashes from fallback to web font
outfit-latin-600-normal... woff2 swap
Size 15 KB
Load time 89 ms
Start 200 ms
Risk FOUT — text flashes from fallback to web font
jetbrains-mono-latin-50... woff2 swap
Size 22 KB
Load time 99 ms
Start 200 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+
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+
Compression Algorithm
Main response uses brotli
PASS
Main response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
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+
Main HTML Cache-Control
Main HTML max-age=0 (≤ 5min) is appropriate
PASS
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: public, max-age=0, must-revalidate
A
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Warning::
Compressed response missing `Vary` header
The page is served with `Content-Encoding: br` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.
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.
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
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
1 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues 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
25 requests over 461ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 1.1 s LCP 7.0 shttps://stelgano.com// https://stelgano.com/ — 200 — 13.1 KiB — 75 ms — h2https://stelgano.com/cdn-cgi/speculation/cdn-cgi/speculation https://stelgano.com/cdn-cgi/speculation — 200 — 484 B — 20 ms — h2https://stelgano.com/assets/app.css/assets/app.css https://stelgano.com/assets/app.css — 200 — 14.7 KiB — 33 ms — h2https://stelgano.com/images/hero_visual.jpg/images/hero_visual.jpg https://stelgano.com/images/hero_visual.jpg — 200 — 235.8 KiB — 79 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 — 109 ms — h2https://stelgano.com/images/ephemeral_identity.png/images/ephemeral_identity.png https://stelgano.com/images/ephemeral_identity.png — 200 — 732.0 KiB — 275 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 — 275 ms — h3https://stelgano.com/images/comparison_visual.jpg/images/comparison_visual.jpg https://stelgano.com/images/comparison_visual.jpg — 200 — 296.6 KiB — 216 ms — h3https://stelgano.com/images/contact_steg.png/images/contact_steg.png https://stelgano.com/images/contact_steg.png — 200 — 408.4 KiB — 256 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 — 275 ms — h3https://stelgano.com/api/funnel/api/funnel https://stelgano.com/api/funnel — 204 — 1013 B — 37 ms — h3https://stelgano.com/images/hero_illustration.png/images/hero_illustration.png https://stelgano.com/images/hero_illustration.png — 200 — 835.0 KiB — 276 ms — h3https://stelgano.com/icons.svg/icons.svg https://stelgano.com/icons.svg — 200 — 6.6 KiB — 110 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 — 14.8 KiB — 86 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 — 89 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 — 90 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 — 25.0 KiB — 102 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 — 90 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 — 21.8 KiB — 99 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 — 24.8 KiB — 100 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 — 102 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 — 89 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 — 99 ms — h3https://stelgano.com/images/favicon-96x96.png/images/favicon-96x96.png https://stelgano.com/images/favicon-96x96.png — 200 — 4.2 KiB — 39 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
1 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

1

Total Size

0 KB

1 missing dimensions
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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