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Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
93
GRADE
A
FIX
0
REVIEW
7
PASS
16
INFO
2

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

99
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.
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.

930 ms

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

1.97 s

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

78 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.

930 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.

1.98 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
C
JS Execution Cost
Action
1941ms total JS execution
REVIEW
1941ms total JS execution
Warning::
https://akj.io/_next/static/chunks/470.146a4cc5d59...: 1200ms CPU time
Warning::
https://akj.io/_next/static/chunks/402-47bfdc5efea...: 361ms CPU time
Info::
https://akj.io/: 202ms CPU time
Info::
Unattributable: 178ms CPU time
Info::
Third-party scripts: 178ms (9% of total)

Main Thread Breakdown

Other 56% Script Evaluation 26% Style & Layout 11%
ScriptTotalScriptingParse/CompileParty
https://akj.io/_next/static/chunks/470.146a4cc5d5931a53.js1200ms153ms1ms1st
https://akj.io/_next/static/chunks/402-47bfdc5efea28fc0.js361ms306ms13ms1st
https://akj.io/202ms9ms5ms1st
Unattributable178ms10ms0ms3rd
B
JS Bundles
11 scripts, 72 KB unused
REVIEW
11 scripts, 72 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/643ad021-013c34...: 22 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://akj.io/_next/static/chunks/402-47bfdc5efea...: 22 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 72 KB
72 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/643ad021-013c3462a72e4cbe.js63 KB22 KB (35%)✓1st
https://akj.io/_next/static/chunks/402-47bfdc5efea28fc0.js59 KB22 KB (37%)✓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.js2 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
262 KB transferred, 26 requests
PASS
262 KB transferred, 26 requests
Info::
Page weighs 709 KB (262 KB transferred)
Info::
26 HTTP requests
Info::
Estimated 0.05 g CO2 per page load
262 KB / 2.4 MB budget
262 KB transferred
26 requests
0.05 g CO2 per page load
JavaScript 183.9 KiB 70%
Fonts 54.0 KiB 21%
HTML 8.4 KiB 3%
Other 7.6 KiB 3%
CSS 7.5 KiB 3%
Other 538 B 0%
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 2.0 s FCP 930 ms LCP 2.0 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 — 31 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 — 33 ms — font-display: swap
49d2f31d75dd11b6-s.p.woff2 woff2 swap
Size 6 KB
Load time 31 ms
Start 135 ms
Risk FOUT — text flashes from fallback to web font
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 33 ms
Start 136 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
26 resources · 262 KB · 72 KB savings available
PASS
26 resources · 262 KB · 72 KB savings available
Info::
Within 1MB page-weight target
Got: 262 KB
Info::
~72 KB of savings available
26 resources · 261.8 KiB · 0 third-party Within 1MB page-weight target
JavaScript 70% · 183.9 KiB
Font 21% · 54.0 KiB
Document 3% · 8.4 KiB
Other 3% · 7.6 KiB
CSS 3% · 7.5 KiB
Image 0% · 538 B

~72.1 KiB of savings available

Remove unused JavaScript: 72.1 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
26 requests over 628ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 930 ms LCP 2.0 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 — 31 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 — 33 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 — 31 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 — 33 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 — 31 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 — 55 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 — 59.0 KiB — 56 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 — 753 B — 48 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 — 51 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 — 6.4 KiB — 33 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 — 55 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 — 3.5 KiB — 54 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 — 721 B — 52 ms — h2https://akj.io/favicon.ico/favicon.ico https://akj.io/favicon.ico — 200 — 538 B — 30 ms — h2https://akj.io/_next/static/chunks/470.146a4cc5d5931a53.js/_next/static/chunks/470.146a4cc5d5... https://akj.io/_next/static/chunks/470.146a4cc5d5931a53.js — 200 — 2.3 KiB — 28 ms — h2https://akj.io/f7128b5d85940e9d/script.js/f7128b5d85940e9d/script.js https://akj.io/f7128b5d85940e9d/script.js — 200 — 4.8 KiB — 41 ms — h2https://akj.io/work?_rsc=1r34m/work?_rsc=1r34m https://akj.io/work?_rsc=1r34m — 200 — 237 B — 144 ms — h2https://akj.io/about?_rsc=1r34m/about?_rsc=1r34m https://akj.io/about?_rsc=1r34m — 200 — 309 B — 134 ms — h2https://akj.io/posts?_rsc=1r34m/posts?_rsc=1r34m https://akj.io/posts?_rsc=1r34m — 200 — 77 B — 150 ms — h2https://akj.io/?_rsc=1pn8p/?_rsc=1pn8p https://akj.io/?_rsc=1pn8p — 200 — 1.2 KiB — 31 ms — h2https://akj.io/?_rsc=nn07o/?_rsc=nn07o https://akj.io/?_rsc=nn07o — 200 — 2.3 KiB — 37 ms — h2https://akj.io/?_rsc=ivliq/?_rsc=ivliq https://akj.io/?_rsc=ivliq — 200 — 2.3 KiB — 40 ms — h2https://akj.io/about?_rsc=p37cr/about?_rsc=p37cr https://akj.io/about?_rsc=p37cr — 200 — 60 B — 143 ms — h2https://akj.io/work?_rsc=p37cr/work?_rsc=p37cr https://akj.io/work?_rsc=p37cr — 200 — 60 B — 137 ms — h2https://akj.io/posts?_rsc=p37cr/posts?_rsc=p37cr https://akj.io/posts?_rsc=p37cr — 200 — 1.0 KiB — 162 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
9% of JavaScript execution is third-party
First-party Third-party 178ms · 0KB · $2/mo
Unattributable
Other
Optional
Execution 178ms
Transfer 0 KB
Monthly Cost $2/mo

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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