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https://akj.io

Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
96
GRADE
A
FIX
1
REVIEW
4
PASS
18
INFO
2

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

100
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.
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.

788 ms

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

894 ms

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

31 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.

1.35 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.

896 ms

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
18 PASS 4 REVIEW 1 FIX
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-cache, no-store, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, no-cache, no-store, max-age=0, must-revalidate

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-cache—Cache but always revalidate first
no-store—Never cache this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
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

A+
Page Weight Budget
45 KB transferred, 15 requests
PASS
45 KB transferred, 15 requests
Info::
Page weighs 66 KB (45 KB transferred)
Info::
15 HTTP requests
Info::
Estimated 0.01 g CO2 per page load
45 KB / 2.4 MB budget
45 KB transferred
15 requests
0.01 g CO2 per page load
Other 33.3 KiB 74%
HTML 8.7 KiB 19%
JavaScript 2.1 KiB 5%
Fonts 587 B 1%
CSS 454 B 1%
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+
JS Execution Cost
281ms total JS execution
PASS
281ms total JS execution
Info::
Unattributable: 149ms CPU time
Info::
https://akj.io/: 132ms CPU time
Warning::
Third-party scripts: 149ms (53% of total)

Main Thread Breakdown

Other 56% Style & Layout 28% Script Evaluation 8% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable149ms7ms0ms3rd
https://akj.io/132ms12ms7ms1st
A+
Font Loading
2 fonts (1 KB)
PASS
2 fonts (1 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

1 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 FCP 788 ms LCP 894 mshttps://akj.io/_next/static/media/49d2f31d75dd11b6-s.p.woff249d2f31d75dd11b6-s.p.woff2 https://akj.io/_next/static/media/49d2f31d75dd11b6-s.p.woff2 — 359 B — 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 — 228 B — 31 ms — font-display: swap
49d2f31d75dd11b6-s.p.woff2 woff2 swap
Size 0 KB
Load time 31 ms
Start 606 ms
Risk FOUT — text flashes from fallback to web font
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 0 KB
Load time 31 ms
Start 610 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
9 scripts, 0 KB unused
PASS
9 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://akj.io/_next/static/chunks/webpack-15fe2c47a455b7a5.js0 KB—✓1st
https://akj.io/_next/static/chunks/643ad021-013c3462a72e4cbe.js0 KB—✓1st
https://akj.io/_next/static/chunks/402-47bfdc5efea28fc0.js0 KB—✓1st
https://akj.io/_next/static/chunks/main-app-79fbab2d97f8f13b.js0 KB—✓1st
https://akj.io/_next/static/chunks/170-43ad85bd76a3c8b0.js0 KB—✓1st
https://akj.io/_next/static/chunks/app/layout-9a3f39613b85b384.js0 KB—✓1st
https://akj.io/_next/static/chunks/390-2daba5734f8e157e.js0 KB—✓1st
https://akj.io/_next/static/chunks/718-f53a9cf5cee88ff6.js0 KB—✓1st
https://akj.io/_next/static/chunks/app/page-6f9ba041da9cc55f.js0 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+
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 uses no-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: private, no-cache, no-store, 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::
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
15 resources · 45 KB · 0 KB savings available
PASS
15 resources · 45 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 45 KB
15 resources · 45.1 KiB · 0 third-party Within 1MB page-weight target
Document 93% · 42.0 KiB
JavaScript 5% · 2.1 KiB
Font 1% · 587 B
CSS 1% · 454 B
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
15 requests over 716ms
INFO
0 ms 200 ms 400 ms 600 ms 800 ms FCP 788 ms LCP 894 mshttps://akj.io// https://akj.io/ — 200 — 8.7 KiB — 593 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 — 403 — 359 B — 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 — 403 — 228 B — 31 ms — h2https://akj.io/_next/static/css/a55673d188103a3c.css/_next/static/css/a55673d188103a3c.... https://akj.io/_next/static/css/a55673d188103a3c.css — 403 — 226 B — 25 ms — h2https://akj.io/_next/static/css/c194051cff2302bb.css/_next/static/css/c194051cff2302bb.... https://akj.io/_next/static/css/c194051cff2302bb.css — 403 — 228 B — 25 ms — h2https://akj.io/_next/static/chunks/webpack-15fe2c47a455b7a5.js/_next/static/chunks/webpack-15fe2c... https://akj.io/_next/static/chunks/webpack-15fe2c47a455b7a5.js — 403 — 226 B — 53 ms — h2https://akj.io/_next/static/chunks/643ad021-013c3462a72e4cbe.js/_next/static/chunks/643ad021-013c3... https://akj.io/_next/static/chunks/643ad021-013c3462a72e4cbe.js — 403 — 226 B — 54 ms — h2https://akj.io/_next/static/chunks/402-47bfdc5efea28fc0.js/_next/static/chunks/402-47bfdc5efe... https://akj.io/_next/static/chunks/402-47bfdc5efea28fc0.js — 403 — 225 B — 53 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 — 403 — 226 B — 54 ms — h2https://akj.io/_next/static/chunks/170-43ad85bd76a3c8b0.js/_next/static/chunks/170-43ad85bd76... https://akj.io/_next/static/chunks/170-43ad85bd76a3c8b0.js — 403 — 227 B — 52 ms — h2https://akj.io/_next/static/chunks/app/layout-9a3f39613b85b384.js/_next/static/chunks/app/layout-9a3... https://akj.io/_next/static/chunks/app/layout-9a3f39613b85b384.js — 403 — 234 B — 52 ms — h2https://akj.io/_next/static/chunks/390-2daba5734f8e157e.js/_next/static/chunks/390-2daba5734f... https://akj.io/_next/static/chunks/390-2daba5734f8e157e.js — 403 — 245 B — 51 ms — h2https://akj.io/_next/static/chunks/718-f53a9cf5cee88ff6.js/_next/static/chunks/718-f53a9cf5ce... https://akj.io/_next/static/chunks/718-f53a9cf5cee88ff6.js — 403 — 225 B — 52 ms — h2https://akj.io/_next/static/chunks/app/page-6f9ba041da9cc55f.js/_next/static/chunks/app/page-6f9ba... https://akj.io/_next/static/chunks/app/page-6f9ba041da9cc55f.js — 403 — 346 B — 52 ms — h2https://akj.io/favicon.ico/favicon.ico https://akj.io/favicon.ico — 403 — 33.3 KiB — 18 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
53% of JavaScript execution is third-party
First-party Third-party 149ms · 0KB · $2/mo
Unattributable
Other
Optional
Execution 149ms
Transfer 0 KB
Monthly Cost $2/mo

53% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

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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