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Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
95
GRADE
A
FIX
0
REVIEW
5
PASS
18
INFO
3

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

Mobile Desktop
85
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.
100
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.

2.59 s

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

3.11 s

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

178 ms

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

0.100

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

2.92 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.

3.12 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
C
JS Execution Cost
Action
1756ms total JS execution
REVIEW
1756ms total JS execution
Warning::
https://lantian.pub/: 851ms CPU time
Warning::
https://lantian.pub/assets/PlausibleAnalytics.astr...: 467ms CPU time
Warning::
Unattributable: 349ms CPU time
Info::
https://lantian.pub/assets/PostText.ECbz3ClE.css: 89ms CPU time

Main Thread Breakdown

Style & Layout 66% Other 19% Script Evaluation 7% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://lantian.pub/851ms15ms4ms1st
https://lantian.pub/assets/PlausibleAnalytics.astro_astro_type_script_index_0_lang.CCqn5Tkb.js467ms11ms0ms1st
Unattributable349ms90ms0ms1st
https://lantian.pub/assets/PostText.ECbz3ClE.css89ms0ms0ms1st
B
Main HTML Cache-Control
Cache-Control present but without max-age
REVIEW
Cache-Control present but without max-age
Info::
Main HTML Cache-Control has no max-age: private
Got: private
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
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
private
REVIEW
private
Info::
Cache-Control header is set
Got: private
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

private

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
A+
Page Weight Budget
418 KB transferred, 19 requests
PASS
418 KB transferred, 19 requests
Info::
Page weighs 810 KB (418 KB transferred)
Info::
Fonts are 220 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 220 KB
Info::
19 HTTP requests
Info::
Estimated 0.09 g CO2 per page load
418 KB / 2.4 MB budget
418 KB transferred
19 requests
0.09 g CO2 per page load
Fonts 219.7 KiB 53%
CSS 62.9 KiB 15%
Images 57.1 KiB 14%
Other 35.8 KiB 9%
JavaScript 25.2 KiB 6%
HTML 12.1 KiB 3%
Other 3.1 KiB 1%
Other 2.0 KiB 0%
Other 224 B 0%
0 2.4 MB 4.9 MB
Under budget

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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
Image Optimization
4 images, 0 KB saveable
PASS
4 images, 0 KB saveable
Warning::
https://lantian.pub/usr/uploads/202512/im-doing-my... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://lantian.pub/usr/uploads/202505/logarithm.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://lantian.pub/usr/uploads/202110/nixos-socia... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
4 images 57 KB
0 oversized -0 KB
0 legacy format
3 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

A+
Font Loading
3 fonts (220 KB)
PASS
3 fonts (220 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

220 KB total

Render-blocking

0

of 3

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 2.6 s LCP 3.1 shttps://lantian.pub/assets/ubuntu-latin-700-normal.DlYwEzNn.woff2ubuntu-latin-700-normal... https://lantian.pub/assets/ubuntu-latin-700-normal.DlYwEzNn.woff2 — 29.8 KiB — 27 ms — font-display: swaphttps://lantian.pub/assets/fa-solid-900.CTAAxXor.woff2fa-solid-900.CTAAxXor.w... https://lantian.pub/assets/fa-solid-900.CTAAxXor.woff2 — 155.1 KiB — 63 ms — font-display: swaphttps://lantian.pub/assets/ubuntu-latin-400-normal.CQJ26Fy6.woff2ubuntu-latin-400-normal... https://lantian.pub/assets/ubuntu-latin-400-normal.CQJ26Fy6.woff2 — 34.7 KiB — 48 ms — font-display: swap
ubuntu-latin-700-normal... woff2 swap
Size 30 KB
Load time 27 ms
Start 338 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.CTAAxXor.w... woff2 swap
Size 155 KB
Load time 63 ms
Start 339 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
ubuntu-latin-400-normal... woff2 swap
Size 35 KB
Load time 48 ms
Start 339 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)

Fixing the unchecked items could save ~78 KB and ~156 ms

A+
JS Bundles
5 scripts, 0 KB unused
PASS
5 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://lantian.pub/assets/PageLayout.astro_astro_type_script_index_0_lang.I87Dj7a_.js21 KB—✓1st
https://lantian.pub/assets/WalineRecentComments.astro_astro_type_script_index_0_lang.IH-4y8rJ.js1 KB—✓1st
https://lantian.pub/assets/PlausibleAnalytics.astro_astro_type_script_index_0_lang.CCqn5Tkb.js2 KB—✓1st
https://lantian.pub/assets/rolldown-runtime.Bh1tDfsg.js1 KB—✓1st
https://lantian.pub/assets/is-localhost.CAyeVhDG.js1 KB—✓1st
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+
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::
Both `ETag` and `Last-Modified` present -- efficient revalidation supported
The page returns both `ETag` (content hash) and `Last-Modified` (timestamp) headers. Browsers can issue conditional GETs with `If-None-Match` or `If-Modified-Since`; the server returns 304 Not Modified for unchanged content, saving bandwidth. ETag is the more reliable of the two (timestamps fail in DST transitions and clock skew).
A+
Page Weight Inventory
19 resources · 418 KB · 0 KB savings available
PASS
19 resources · 418 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 418 KB
Info::
1 third-party resources (0% of weight)
19 resources · 417.9 KiB · 1 third-party Within 1MB page-weight target
Font 53% · 219.7 KiB
Image 22% · 92.8 KiB
CSS 15% · 62.9 KiB
JavaScript 6% · 25.2 KiB
Document 3% · 12.1 KiB
Other 1% · 5.3 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
Network Waterfall
19 requests over 791ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.6 s LCP 3.1 shttps://lantian.pub// https://lantian.pub/ — 200 — 12.1 KiB — 55 ms — h2https://lantian.pub/assets/PostText.ECbz3ClE.css/assets/PostText.ECbz3ClE.css https://lantian.pub/assets/PostText.ECbz3ClE.css — 200 — 62.9 KiB — 39 ms — h2https://lantian.pub/assets/PageLayout.astro_astro_type_script_index_0_lang.I87Dj7a_.js/assets/PageLayout.astro_astro_type... https://lantian.pub/assets/PageLayout.astro_astro_type_script_index_0_lang.I87Dj7a_.js — 200 — 20.6 KiB — 40 ms — h2https://lantian.pub/usr/uploads/202512/im-doing-my-part.png.thumb.png.webp/usr/uploads/202512/im-doing-my-par... https://lantian.pub/usr/uploads/202512/im-doing-my-part.png.thumb.png.webp — 200 — 45.8 KiB — 43 ms — h2https://lantian.pub/usr/uploads/202505/logarithm.png.thumb.png.webp/usr/uploads/202505/logarithm.png.t... https://lantian.pub/usr/uploads/202505/logarithm.png.thumb.png.webp — 200 — 3.2 KiB — 50 ms — h2https://lantian.pub/assets/WalineRecentComments.astro_astro_type_script_index_0_lang.IH-4y8rJ.js/assets/WalineRecentComments.astro_... https://lantian.pub/assets/WalineRecentComments.astro_astro_type_script_index_0_lang.IH-4y8rJ.js — 200 — 1.0 KiB — 48 ms — h2https://lantian.pub/assets/PlausibleAnalytics.astro_astro_type_script_index_0_lang.CCqn5Tkb.js/assets/PlausibleAnalytics.astro_as... https://lantian.pub/assets/PlausibleAnalytics.astro_astro_type_script_index_0_lang.CCqn5Tkb.js — 200 — 1.8 KiB — 48 ms — h2https://lantian.pub/usr/uploads/202110/nixos-social-preview.png.thumb.png.webp/usr/uploads/202110/nixos-social-pr... https://lantian.pub/usr/uploads/202110/nixos-social-preview.png.thumb.png.webp — 200 — 8.1 KiB — 47 ms — h2https://lantian.pub/manifest.webmanifest/manifest.webmanifest https://lantian.pub/manifest.webmanifest — 200 — 2.0 KiB — 56 ms — h3data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3E%3…www.w3.org/2000/svg' viewBox='0 0 3... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3E%3… — 200 — 0 B — 0 ms — datahttps://lantian.pub/assets/ubuntu-latin-700-normal.DlYwEzNn.woff2/assets/ubuntu-latin-700-normal.DlY... https://lantian.pub/assets/ubuntu-latin-700-normal.DlYwEzNn.woff2 — 200 — 29.8 KiB — 27 ms — h3https://lantian.pub/assets/fa-solid-900.CTAAxXor.woff2/assets/fa-solid-900.CTAAxXor.woff2 https://lantian.pub/assets/fa-solid-900.CTAAxXor.woff2 — 200 — 155.1 KiB — 63 ms — h3https://lantian.pub/assets/ubuntu-latin-400-normal.CQJ26Fy6.woff2/assets/ubuntu-latin-400-normal.CQJ... https://lantian.pub/assets/ubuntu-latin-400-normal.CQJ26Fy6.woff2 — 200 — 34.7 KiB — 48 ms — h3https://lantian.pub/assets/rolldown-runtime.Bh1tDfsg.js/assets/rolldown-runtime.Bh1tDfsg.j... https://lantian.pub/assets/rolldown-runtime.Bh1tDfsg.js — 200 — 1.0 KiB — 46 ms — h3https://lantian.pub/assets/is-localhost.CAyeVhDG.js/assets/is-localhost.CAyeVhDG.js https://lantian.pub/assets/is-localhost.CAyeVhDG.js — 200 — 777 B — 45 ms — h3https://lantian.pub/api/comment?type=recent&count=10/api/comment?type=recent&count=10 https://lantian.pub/api/comment?type=recent&count=10 — 200 — 3.1 KiB — 366 ms — h3https://lantian.pub/api/event/api/event https://lantian.pub/api/event — 202 — 224 B — 67 ms — h3https://lantian.pub/favicon.svg/favicon.svg https://lantian.pub/favicon.svg — 200 — 2.6 KiB — 14 ms — h3https://lantian.pub/favicon.ico/favicon.ico https://lantian.pub/favicon.ico — 200 — 33.2 KiB — 14 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-06-24 — 2026-07-21)

LCP (p75)

1195 ms

93% good

INP (p75)

0 ms

0% good

CLS (p75)

0.010

92% good

FCP (p75)

1240 ms

TTFB (p75)

627 ms

Image Optimization
3 images, 56 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

3

Total Size

56 KB

3 missing dimensions 3 missing lazy loading
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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