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Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
94
GRADE
A
FIX
0
REVIEW
7
PASS
16
INFO
2

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

98
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
69
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
80
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.

932 ms

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

1.53 s

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

164 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.

945 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.

2.22 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
16 PASS 7 REVIEW
B
JS Execution Cost
958ms total JS execution
REVIEW
958ms total JS execution
Warning::
Unattributable: 277ms CPU time
Info::
https://akj.io/: 245ms CPU time
Info::
https://akj.io/_next/static/chunks/643ad021-013c34...: 234ms CPU time
Info::
https://akj.io/_next/static/chunks/402-47bfdc5efea...: 201ms CPU time
Info::
Third-party scripts: 277ms (29% of total)

Main Thread Breakdown

Script Evaluation 40% Other 31% Style & Layout 18% Script Parsing & Compilation 5% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
Unattributable277ms2ms0ms3rd
https://akj.io/245ms7ms5ms1st
https://akj.io/_next/static/chunks/643ad021-013c3462a72e4cbe.js234ms215ms15ms1st
https://akj.io/_next/static/chunks/402-47bfdc5efea28fc0.js201ms165ms13ms1st
B
JS Bundles
11 scripts, 73 KB unused
REVIEW
11 scripts, 73 KB unused
Warning::
https://akj.io/_next/static/chunks/390-2daba5734f8...: 28 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://akj.io/_next/static/chunks/402-47bfdc5efea...: 24 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://akj.io/_next/static/chunks/643ad021-013c34...: 21 KB unused (34%)
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://akj.io/_next/static/chunks/390-2daba5734f8e157e.js37 KB28 KB (75%)✓1st
https://akj.io/_next/static/chunks/402-47bfdc5efea28fc0.js59 KB24 KB (40%)✓1st
https://akj.io/_next/static/chunks/643ad021-013c3462a72e4cbe.js63 KB21 KB (34%)✓1st
https://akj.io/_next/static/chunks/webpack-15fe2c47a455b7a5.js2 KB—✓1st
https://akj.io/_next/static/chunks/main-app-79fbab2d97f8f13b.js1 KB—✓1st
https://akj.io/_next/static/chunks/170-43ad85bd76a3c8b0.js4 KB—✓1st
https://akj.io/_next/static/chunks/app/layout-aee5c53777102c03.js6 KB—✓1st
https://akj.io/_next/static/chunks/718-f53a9cf5cee88ff6.js3 KB—✓1st
https://akj.io/_next/static/chunks/app/page-3d7dc22bfc32e3cb.js1 KB—✓1st
https://akj.io/_next/static/chunks/470.146a4cc5d5931a53.js0 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

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

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

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
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main 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
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
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::
ETag present — enables conditional (304) responses
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+
Page Weight Budget
447 KB transferred, 22 requests
PASS
447 KB transferred, 22 requests
Info::
Page weighs 865 KB (447 KB transferred)
Info::
22 HTTP requests
Info::
Estimated 0.09 g CO2 per page load
447 KB / 2.4 MB budget
447 KB transferred
22 requests
0.09 g CO2 per page load
JavaScript 177.3 KiB 40%
Other 166.5 KiB 37%
Fonts 54.0 KiB 12%
Other 33.3 KiB 7%
HTML 8.4 KiB 2%
CSS 7.5 KiB 2%
0 2.4 MB 4.9 MB
Under budget
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
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
2 fonts (54 KB)
PASS
2 fonts (54 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

54 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 932 ms LCP 1.5 shttps://akj.io/_next/static/media/49d2f31d75dd11b6-s.p.woff249d2f31d75dd11b6-s.p.woff2 https://akj.io/_next/static/media/49d2f31d75dd11b6-s.p.woff2 — 6.5 KiB — 34 ms — font-display: swaphttps://akj.io/_next/static/media/e4af272ccee01ff0-s.p.woff2e4af272ccee01ff0-s.p.woff2 https://akj.io/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 47.5 KiB — 233 ms — font-display: swap
49d2f31d75dd11b6-s.p.woff2 woff2 swap
Size 6 KB
Load time 34 ms
Start 150 ms
Risk FOUT — text flashes from fallback to web font
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 233 ms
Start 153 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
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
Info::
`Vary` header declared: rsc, next-router-state-tree, next-router-prefetch, next-router-segment-prefetch
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::
`ETag` present -- conditional GET supported
A+
Page Weight Inventory
22 resources · 447 KB · 73 KB savings available
PASS
22 resources · 447 KB · 73 KB savings available
Info::
Within 1MB page-weight target
Got: 447 KB
Info::
~73 KB of savings available
22 resources · 446.9 KiB · 0 third-party Within 1MB page-weight target
Document 47% · 208.1 KiB
JavaScript 40% · 177.3 KiB
Font 12% · 54.0 KiB
CSS 2% · 7.5 KiB

~72.6 KiB of savings available

Remove unused JavaScript: 72.6 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
22 requests over 624ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 932 ms LCP 1.5 shttps://akj.io// https://akj.io/ — 200 — 8.4 KiB — 110 ms — h2https://akj.io/_next/static/media/49d2f31d75dd11b6-s.p.woff2/_next/static/media/49d2f31d75dd11b... https://akj.io/_next/static/media/49d2f31d75dd11b6-s.p.woff2 — 200 — 6.5 KiB — 34 ms — h2https://akj.io/_next/static/media/e4af272ccee01ff0-s.p.woff2/_next/static/media/e4af272ccee01ff... https://akj.io/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 47.5 KiB — 233 ms — h2https://akj.io/_next/static/css/bb1d0e0ea60aa56e.css/_next/static/css/bb1d0e0ea60aa56e.... https://akj.io/_next/static/css/bb1d0e0ea60aa56e.css — 200 — 4.1 KiB — 37 ms — h2https://akj.io/_next/static/css/c194051cff2302bb.css/_next/static/css/c194051cff2302bb.... https://akj.io/_next/static/css/c194051cff2302bb.css — 200 — 3.3 KiB — 39 ms — h2https://akj.io/_next/static/chunks/webpack-15fe2c47a455b7a5.js/_next/static/chunks/webpack-15fe2c... https://akj.io/_next/static/chunks/webpack-15fe2c47a455b7a5.js — 200 — 2.2 KiB — 42 ms — h2https://akj.io/_next/static/chunks/643ad021-013c3462a72e4cbe.js/_next/static/chunks/643ad021-013c3... https://akj.io/_next/static/chunks/643ad021-013c3462a72e4cbe.js — 200 — 63.0 KiB — 335 ms — h2https://akj.io/_next/static/chunks/402-47bfdc5efea28fc0.js/_next/static/chunks/402-47bfdc5efe... https://akj.io/_next/static/chunks/402-47bfdc5efea28fc0.js — 200 — 59.2 KiB — 67 ms — h2https://akj.io/_next/static/chunks/main-app-79fbab2d97f8f13b.js/_next/static/chunks/main-app-79fba... https://akj.io/_next/static/chunks/main-app-79fbab2d97f8f13b.js — 200 — 752 B — 60 ms — h2https://akj.io/_next/static/chunks/170-43ad85bd76a3c8b0.js/_next/static/chunks/170-43ad85bd76... https://akj.io/_next/static/chunks/170-43ad85bd76a3c8b0.js — 200 — 3.8 KiB — 64 ms — h2https://akj.io/_next/static/chunks/app/layout-aee5c53777102c03.js/_next/static/chunks/app/layout-aee... https://akj.io/_next/static/chunks/app/layout-aee5c53777102c03.js — 200 — 6.2 KiB — 53 ms — h2https://akj.io/_next/static/chunks/390-2daba5734f8e157e.js/_next/static/chunks/390-2daba5734f... https://akj.io/_next/static/chunks/390-2daba5734f8e157e.js — 200 — 37.4 KiB — 64 ms — h2https://akj.io/_next/static/chunks/718-f53a9cf5cee88ff6.js/_next/static/chunks/718-f53a9cf5ce... https://akj.io/_next/static/chunks/718-f53a9cf5cee88ff6.js — 200 — 3.4 KiB — 160 ms — h2https://akj.io/_next/static/chunks/app/page-3d7dc22bfc32e3cb.js/_next/static/chunks/app/page-3d7dc... https://akj.io/_next/static/chunks/app/page-3d7dc22bfc32e3cb.js — 200 — 726 B — 45 ms — h2https://akj.io/_next/static/chunks/470.146a4cc5d5931a53.js/_next/static/chunks/470.146a4cc5d5... https://akj.io/_next/static/chunks/470.146a4cc5d5931a53.js — 403 — 380 B — 27 ms — h2https://akj.io/favicon.ico/favicon.ico https://akj.io/favicon.ico — 403 — 33.3 KiB — 28 ms — h2https://akj.io/f7128b5d85940e9d/script.js/f7128b5d85940e9d/script.js https://akj.io/f7128b5d85940e9d/script.js — 403 — 226 B — 36 ms — h2https://akj.io/work?_rsc=1r34m/work?_rsc=1r34m https://akj.io/work?_rsc=1r34m — 403 — 33.3 KiB — 25 ms — h2https://akj.io/about?_rsc=1r34m/about?_rsc=1r34m https://akj.io/about?_rsc=1r34m — 403 — 33.3 KiB — 26 ms — h2https://akj.io/posts?_rsc=1r34m/posts?_rsc=1r34m https://akj.io/posts?_rsc=1r34m — 403 — 33.3 KiB — 28 ms — h2https://akj.io/?_rsc=1pn8p/?_rsc=1pn8p https://akj.io/?_rsc=1pn8p — 403 — 33.3 KiB — 31 ms — h2https://akj.io/?_rsc=nn07o/?_rsc=nn07o https://akj.io/?_rsc=nn07o — 403 — 33.3 KiB — 33 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
29% of JavaScript execution is third-party
First-party Third-party 277ms · 0KB · $4/mo
Unattributable
Other
Costly
Execution 277ms
Transfer 0 KB
Monthly Cost $4/mo

These scripts may cost more than they're worth

  • Unattributable adds 277ms and costs ~$4/month

Unattributable takes 277ms 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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