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Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
94
GRADE
A
FIX
0
REVIEW
5
PASS
18
INFO
3

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

Mobile Desktop
91
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.
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.

2.42 s

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

2.64 s

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

161 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.

2.87 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.

2.64 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
26
18 PASS 5 REVIEW
B
JS Execution Cost
613ms total JS execution
REVIEW
613ms total JS execution
Warning::
https://wermuind.github.io/notes/assets/js/main.e7...: 418ms CPU time
Info::
Unattributable: 120ms CPU time
Info::
https://wermuind.github.io/notes/: 74ms CPU time

Main Thread Breakdown

Script Evaluation 60% Other 22% Style & Layout 9% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://wermuind.github.io/notes/assets/js/main.e7f95702.js418ms361ms32ms1st
Unattributable120ms5ms0ms1st
https://wermuind.github.io/notes/74ms6ms2ms1st
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Document Compression
Action
Document response served uncompressed
REVIEW
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.
B
Main HTML Cache-Control
Main HTML max-age=600 (~10min)
REVIEW
Main HTML max-age=600 (~10min)
Info::
Main HTML cached for 10 minutes -- mild staleness risk
Got: max-age=600
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.
A+
Page Weight Budget
216 KB transferred, 23 requests
PASS
216 KB transferred, 23 requests
Info::
Page weighs 582 KB (216 KB transferred)
Info::
23 HTTP requests
Info::
Estimated 0.04 g CO2 per page load
216 KB / 2.4 MB budget
216 KB transferred
23 requests
0.04 g CO2 per page load
JavaScript 151.9 KiB 70%
Other 40.5 KiB 19%
CSS 19.7 KiB 9%
HTML 3.3 KiB 2%
Images 555 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
2% third-party, 0 ms blocking
PASS
2% third-party, 0 ms blocking
Info::
Third-party code accounts for 2% of page weight (4.0 KiB of 215.9 KiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-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
Image Optimization
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Warning::
https://wermuind.github.io/notes/img/logo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
1 images 1 KB
0 oversized -0 KB
1 legacy format
1 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

A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
17 scripts, 48 KB unused
PASS
17 scripts, 48 KB unused
Warning::
https://wermuind.github.io/notes/assets/js/main.e7...: 48 KB unused (33%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 48 KB
48 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://wermuind.github.io/notes/assets/js/main.e7f95702.js146 KB48 KB (33%)✓1st
https://wermuind.github.io/notes/assets/js/a7bd4aaa.1fb8a8c3.js1 KB—✓1st
https://wermuind.github.io/notes/assets/js/a94703ab.8e0dd683.js4 KB—✓1st
https://wermuind.github.io/notes/assets/js/a7456010.bbdc04fb.js0 KB—✓1st
https://wermuind.github.io/notes/assets/js/1df93b7f.bb37a7d6.js0 KB—✓1st
https://wermuind.github.io/notes/assets/js/a7456010.bbdc04fb.js0 KB—✓1st
https://wermuind.github.io/notes/assets/js/5e95c892.c69de1b8.js0 KB—✓1st
https://wermuind.github.io/notes/assets/js/1df93b7f.bb37a7d6.js2 KB—✓1st
https://wermuind.github.io/notes/assets/js/aba21aa0.976261cc.js0 KB—✓1st
https://wermuind.github.io/notes/assets/js/c5b15a86.4b29f6bb.js5 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 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
169 hints, 0 missing preconnects
PASS
169 hints, 0 missing preconnects
Info::
8 URL(s) appear in multiple hints
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: /notes/assets/js/1df93b7f.bb37a7d6.js (prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch), /notes/assets/js/a7456010.bbdc04fb.js (prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch), /notes/assets/js/aba21aa0.976261cc.js (prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch) (+5 more).
Info::
Page uses 169 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
—
prefetch
+158
168

169 resource hints configured

The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: /notes/assets/js/1df93b7f.bb37a7d6.js (prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch), /notes/assets/js/a7456010.bbdc04fb.js (prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch), /notes/assets/js/aba21aa0.976261cc.js (prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch+prefetch) (+5 more).

Why this matters

Performance issues directly impact user engagement and conversion rates.

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+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
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+
Page Weight Inventory
23 resources · 216 KB · 48 KB savings available
PASS
23 resources · 216 KB · 48 KB savings available
Info::
Within 1MB page-weight target
Got: 216 KB
Info::
1 third-party resources (2% of weight)
23 resources · 215.9 KiB · 1 third-party Within 1MB page-weight target
JavaScript 85% · 183.7 KiB
CSS 9% · 19.7 KiB
Image 4% · 8.8 KiB
Document 2% · 3.7 KiB

~47.9 KiB of savings available

Remove unused JavaScript: 47.9 KiB
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
No render-blocking JS or document.write usage detected
PASS
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
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: Fastly

A
HTTP Caching
max-age=600 (10 minutes)
PASS
max-age=600 (10 minutes)
Info::
Cache-Control header is set
Got: max-age=600
Info::
Effective TTL: 10 minutes (max-age=600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=600

DirectiveValueMeaning
max-age600Cache for 10 minutes
Effective TTL: 600 seconds
Asset Compression
No text asset hosts to measure
INFO
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 Waterfall
23 requests over 1490ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 2.4 s LCP 2.6 shttps://wermuind.github.io/notes/notes https://wermuind.github.io/notes — 301 — 388 B — 8 ms — h2https://wermuind.github.io/notes//notes/ https://wermuind.github.io/notes/ — 200 — 3.3 KiB — 3 ms — h2https://cdn.jsdelivr.net/npm/katex@0.13.24/dist/katex.min.csscdn.jsdelivr.net/npm/katex@0.13.24/... https://cdn.jsdelivr.net/npm/katex@0.13.24/dist/katex.min.css — 200 — 4.0 KiB — 100 ms — h2https://wermuind.github.io/notes/assets/css/styles.cca95ad9.css/notes/assets/css/styles.cca95ad9.c... https://wermuind.github.io/notes/assets/css/styles.cca95ad9.css — 200 — 15.6 KiB — 250 ms — h2https://wermuind.github.io/notes/img/logo.svg/notes/img/logo.svg https://wermuind.github.io/notes/img/logo.svg — 200 — 555 B — 327 ms — h2https://wermuind.github.io/notes/assets/js/runtime~main.a690aa58.js/notes/assets/js/runtime~main.a690a... https://wermuind.github.io/notes/assets/js/runtime~main.a690aa58.js — 200 — 3.3 KiB — 329 ms — h2https://wermuind.github.io/notes/assets/js/main.e7f95702.js/notes/assets/js/main.e7f95702.js https://wermuind.github.io/notes/assets/js/main.e7f95702.js — 200 — 146.5 KiB — 350 ms — h2https://wermuind.github.io/notes/assets/js/1df93b7f.bb37a7d6.js/notes/assets/js/1df93b7f.bb37a7d6.... https://wermuind.github.io/notes/assets/js/1df93b7f.bb37a7d6.js — 200 — 1.7 KiB — 154 ms — h2https://wermuind.github.io/notes/assets/js/a7456010.bbdc04fb.js/notes/assets/js/a7456010.bbdc04fb.... https://wermuind.github.io/notes/assets/js/a7456010.bbdc04fb.js — 200 — 362 B — 143 ms — h2https://wermuind.github.io/notes/img/favicon.ico/notes/img/favicon.ico https://wermuind.github.io/notes/img/favicon.ico — 200 — 8.3 KiB — 146 ms — h2https://wermuind.github.io/notes/assets/js/1df93b7f.bb37a7d6.js/notes/assets/js/1df93b7f.bb37a7d6.... https://wermuind.github.io/notes/assets/js/1df93b7f.bb37a7d6.js — 200 — 0 B — 2 ms — h2https://wermuind.github.io/notes/assets/js/a7456010.bbdc04fb.js/notes/assets/js/a7456010.bbdc04fb.... https://wermuind.github.io/notes/assets/js/a7456010.bbdc04fb.js — 200 — 0 B — 4 ms — h2https://wermuind.github.io/notes/assets/js/5e95c892.c69de1b8.js/notes/assets/js/5e95c892.c69de1b8.... https://wermuind.github.io/notes/assets/js/5e95c892.c69de1b8.js — 200 — 496 B — 169 ms — h2https://wermuind.github.io/notes/assets/js/aba21aa0.976261cc.js/notes/assets/js/aba21aa0.976261cc.... https://wermuind.github.io/notes/assets/js/aba21aa0.976261cc.js — 200 — 385 B — 157 ms — h2https://wermuind.github.io/notes/assets/js/a7bd4aaa.1fb8a8c3.js/notes/assets/js/a7bd4aaa.1fb8a8c3.... https://wermuind.github.io/notes/assets/js/a7bd4aaa.1fb8a8c3.js — 200 — 568 B — 164 ms — h2https://wermuind.github.io/notes/assets/js/c5b15a86.4b29f6bb.js/notes/assets/js/c5b15a86.4b29f6bb.... https://wermuind.github.io/notes/assets/js/c5b15a86.4b29f6bb.js — 200 — 4.7 KiB — 140 ms — h2https://wermuind.github.io/notes/assets/js/a94703ab.8e0dd683.js/notes/assets/js/a94703ab.8e0dd683.... https://wermuind.github.io/notes/assets/js/a94703ab.8e0dd683.js — 200 — 4.3 KiB — 153 ms — h2https://wermuind.github.io/notes/assets/js/17896441.5e46b8b2.js/notes/assets/js/17896441.5e46b8b2.... https://wermuind.github.io/notes/assets/js/17896441.5e46b8b2.js — 200 — 12.4 KiB — 157 ms — h2https://wermuind.github.io/notes/assets/js/42e6023b.a446981c.js/notes/assets/js/42e6023b.a446981c.... https://wermuind.github.io/notes/assets/js/42e6023b.a446981c.js — 200 — 1.2 KiB — 190 ms — h2https://wermuind.github.io/notes/assets/js/ed06afee.7460dbad.js/notes/assets/js/ed06afee.7460dbad.... https://wermuind.github.io/notes/assets/js/ed06afee.7460dbad.js — 200 — 1.5 KiB — 140 ms — h2https://wermuind.github.io/notes/assets/js/b09a398e.ff948406.js/notes/assets/js/b09a398e.ff948406.... https://wermuind.github.io/notes/assets/js/b09a398e.ff948406.js — 200 — 1.1 KiB — 170 ms — h2https://wermuind.github.io/notes/assets/js/18aebf98.06298673.js/notes/assets/js/18aebf98.06298673.... https://wermuind.github.io/notes/assets/js/18aebf98.06298673.js — 200 — 2.4 KiB — 144 ms — h2https://wermuind.github.io/notes/assets/js/df932d8d.43eb0a93.js/notes/assets/js/df932d8d.43eb0a93.... https://wermuind.github.io/notes/assets/js/df932d8d.43eb0a93.js — 200 — 2.8 KiB — 157 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
2 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

2

Total Size

0 KB

2 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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