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Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
2
REVIEW
5
PASS
16
INFO
2

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

Mobile Desktop
75
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.

1.05 s

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

3.79 s

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

475 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.

3.90 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.

4.07 s

Page Load Progression

607 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.9 s
Checks
25
16 PASS 5 REVIEW 2 FIX
F
JS Execution Cost
Action
4410ms total JS execution
FIX
4410ms total JS execution
Warning::
https://akj.io/_next/static/chunks/app/layout-e948...: 3329ms CPU time
Warning::
https://akj.io/_next/static/chunks/886-d183764242f...: 270ms CPU time
Info::
Unattributable: 233ms CPU time
Info::
https://akj.io/_next/static/chunks/ddd570f5-01b98e...: 222ms CPU time
Info::
https://akj.io/: 207ms CPU time

Main Thread Breakdown

Other 71% Script Evaluation 21% Style & Layout 4%
ScriptTotalScriptingParse/CompileParty
https://akj.io/_next/static/chunks/app/layout-e948d7d3f6619452.js3329ms319ms3ms1st
https://akj.io/_next/static/chunks/886-d183764242f5e464.js270ms225ms18ms1st
Unattributable233ms12ms0ms1st
https://akj.io/_next/static/chunks/ddd570f5-01b98ebb11ecb88d.js222ms191ms13ms1st
https://akj.io/207ms9ms7ms1st
https://akj.io/_next/static/chunks/509-fd0b977e0d673faa.js150ms144ms1ms1st
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
JS Bundles
12 scripts, 79 KB unused
REVIEW
12 scripts, 79 KB unused
Warning::
https://akj.io/_next/static/chunks/556-7c949566b27...: 29 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://akj.io/_next/static/chunks/ddd570f5-01b98e...: 26 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://akj.io/_next/static/chunks/886-d183764242f...: 24 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 79 KB
79 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://akj.io/_next/static/chunks/556-7c949566b273dff2.js37 KB29 KB (78%)✓1st
https://akj.io/_next/static/chunks/ddd570f5-01b98ebb11ecb88d.js64 KB26 KB (40%)✓1st
https://akj.io/_next/static/chunks/886-d183764242f5e464.js65 KB24 KB (37%)✓1st
https://akj.io/_next/static/chunks/webpack-e7b9aa515b7cf464.js2 KB—✓1st
https://akj.io/_next/static/chunks/main-app-913af6c8dbc13a6c.js1 KB—✓1st
https://akj.io/_next/static/chunks/949-27ee15e7f35f2eb6.js3 KB—✓1st
https://akj.io/_next/static/chunks/509-fd0b977e0d673faa.js6 KB—✓1st
https://akj.io/_next/static/chunks/app/layout-e948d7d3f6619452.js10 KB—✓1st
https://akj.io/_next/static/chunks/653-709f478a1f569f20.js5 KB—✓1st
https://akj.io/_next/static/chunks/app/page-1f9faba13fbbbab9.js1 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.
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.
B
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
1 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
Warning::
Total JS execution time is 4.4 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
549 KB transferred, 30 requests
PASS
549 KB transferred, 30 requests
Info::
Page weighs 1.0 MB (549 KB transferred)
Info::
Fonts are 320 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 320 KB
Info::
30 HTTP requests
Info::
Estimated 0.11 g CO2 per page load
549 KB / 2.4 MB budget
549 KB transferred
30 requests
0.11 g CO2 per page load
Fonts 319.7 KiB 58%
JavaScript 198.3 KiB 36%
HTML 12.7 KiB 2%
CSS 12.6 KiB 2%
Other 5.0 KiB 1%
Other 1.0 KiB 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
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
5 fonts (320 KB)
PASS
5 fonts (320 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

320 KB total

Render-blocking

0

of 5

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 1.0 s LCP 3.8 shttps://akj.io/_next/static/media/22a5144ee8d83bca-s.p.woff222a5144ee8d83bca-s.p.woff2 https://akj.io/_next/static/media/22a5144ee8d83bca-s.p.woff2 — 28.8 KiB — 156 ms — font-display: swaphttps://akj.io/_next/static/media/6448e9c529f1ef4a-s.p.woff26448e9c529f1ef4a-s.p.woff2 https://akj.io/_next/static/media/6448e9c529f1ef4a-s.p.woff2 — 146.5 KiB — 264 ms — font-display: swaphttps://akj.io/_next/static/media/7d4881bb7e1bf84d-s.p.woff27d4881bb7e1bf84d-s.p.woff2 https://akj.io/_next/static/media/7d4881bb7e1bf84d-s.p.woff2 — 22.8 KiB — 157 ms — font-display: swaphttps://akj.io/_next/static/media/966913bad25267a8-s.p.woff2966913bad25267a8-s.p.woff2 https://akj.io/_next/static/media/966913bad25267a8-s.p.woff2 — 3.4 KiB — 142 ms — font-display: swaphttps://akj.io/_next/static/media/cb9f64d62d112b41-s.p.woff2cb9f64d62d112b41-s.p.woff2 https://akj.io/_next/static/media/cb9f64d62d112b41-s.p.woff2 — 118.3 KiB — 278 ms — font-display: swap
22a5144ee8d83bca-s.p.woff2 woff2 swap
Size 29 KB
Load time 156 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
6448e9c529f1ef4a-s.p.woff2 woff2 swap
Size 146 KB
Load time 264 ms
Start 1.5 s
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
7d4881bb7e1bf84d-s.p.woff2 woff2 swap
Size 23 KB
Load time 157 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
966913bad25267a8-s.p.woff2 woff2 swap
Size 3 KB
Load time 142 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
cb9f64d62d112b41-s.p.woff2 woff2 swap
Size 118 KB
Load time 278 ms
Start 1.5 s
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
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 ~132 KB and ~264 ms

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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
—
preload
6
dns-prefetch
—
prefetch
—

6 resource hints configured

A+
Document Compression
Document response uses brotli
PASS
Document 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+
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
30 resources · 549 KB · 79 KB savings available
PASS
30 resources · 549 KB · 79 KB savings available
Info::
Within 1MB page-weight target
Got: 549 KB
Info::
~79 KB of savings available
30 resources · 549.3 KiB · 0 third-party Within 1MB page-weight target
Font 58% · 319.7 KiB
JavaScript 36% · 198.3 KiB
Document 2% · 12.7 KiB
CSS 2% · 12.6 KiB
Other 1% · 5.0 KiB
Image 0% · 1.0 KiB

~78.7 KiB of savings available

Remove unused JavaScript: 78.7 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
CSS Performance Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
5 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
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
30 requests over 2539ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.0 s LCP 3.8 shttps://akj.io// https://akj.io/ — 200 — 12.7 KiB — 1.6 s — h2https://akj.io/_next/static/media/22a5144ee8d83bca-s.p.woff2/_next/static/media/22a5144ee8d83bc... https://akj.io/_next/static/media/22a5144ee8d83bca-s.p.woff2 — 200 — 28.8 KiB — 156 ms — h2https://akj.io/_next/static/media/6448e9c529f1ef4a-s.p.woff2/_next/static/media/6448e9c529f1ef4... https://akj.io/_next/static/media/6448e9c529f1ef4a-s.p.woff2 — 200 — 146.5 KiB — 264 ms — h2https://akj.io/_next/static/media/7d4881bb7e1bf84d-s.p.woff2/_next/static/media/7d4881bb7e1bf84... https://akj.io/_next/static/media/7d4881bb7e1bf84d-s.p.woff2 — 200 — 22.8 KiB — 157 ms — h2https://akj.io/_next/static/media/966913bad25267a8-s.p.woff2/_next/static/media/966913bad25267a... https://akj.io/_next/static/media/966913bad25267a8-s.p.woff2 — 200 — 3.4 KiB — 142 ms — h2https://akj.io/_next/static/media/cb9f64d62d112b41-s.p.woff2/_next/static/media/cb9f64d62d112b4... https://akj.io/_next/static/media/cb9f64d62d112b41-s.p.woff2 — 200 — 118.3 KiB — 278 ms — h2https://akj.io/_next/static/css/6a1d5461642ce6ef.css/_next/static/css/6a1d5461642ce6ef.... https://akj.io/_next/static/css/6a1d5461642ce6ef.css — 200 — 5.8 KiB — 208 ms — h2https://akj.io/_next/static/css/b9461ddfb7d06cda.css/_next/static/css/b9461ddfb7d06cda.... https://akj.io/_next/static/css/b9461ddfb7d06cda.css — 200 — 4.0 KiB — 151 ms — h2https://akj.io/_next/static/css/3a99b56a25fc0195.css/_next/static/css/3a99b56a25fc0195.... https://akj.io/_next/static/css/3a99b56a25fc0195.css — 200 — 685 B — 153 ms — h2https://akj.io/_next/static/css/93f46873d63be3fe.css/_next/static/css/93f46873d63be3fe.... https://akj.io/_next/static/css/93f46873d63be3fe.css — 200 — 1.0 KiB — 147 ms — h2https://akj.io/_next/static/css/3542557ded86e58d.css/_next/static/css/3542557ded86e58d.... https://akj.io/_next/static/css/3542557ded86e58d.css — 200 — 1.1 KiB — 153 ms — h2https://akj.io/_next/static/chunks/webpack-e7b9aa515b7cf464.js/_next/static/chunks/webpack-e7b9aa... https://akj.io/_next/static/chunks/webpack-e7b9aa515b7cf464.js — 200 — 1.9 KiB — 154 ms — h2https://akj.io/_next/static/chunks/ddd570f5-01b98ebb11ecb88d.js/_next/static/chunks/ddd570f5-01b98... https://akj.io/_next/static/chunks/ddd570f5-01b98ebb11ecb88d.js — 200 — 64.1 KiB — 209 ms — h2https://akj.io/_next/static/chunks/886-d183764242f5e464.js/_next/static/chunks/886-d183764242... https://akj.io/_next/static/chunks/886-d183764242f5e464.js — 200 — 65.1 KiB — 207 ms — h2https://akj.io/_next/static/chunks/main-app-913af6c8dbc13a6c.js/_next/static/chunks/main-app-913af... https://akj.io/_next/static/chunks/main-app-913af6c8dbc13a6c.js — 200 — 1.1 KiB — 133 ms — h2https://akj.io/_next/static/chunks/949-27ee15e7f35f2eb6.js/_next/static/chunks/949-27ee15e7f3... https://akj.io/_next/static/chunks/949-27ee15e7f35f2eb6.js — 200 — 3.5 KiB — 138 ms — h2https://akj.io/_next/static/chunks/509-fd0b977e0d673faa.js/_next/static/chunks/509-fd0b977e0d... https://akj.io/_next/static/chunks/509-fd0b977e0d673faa.js — 200 — 6.3 KiB — 134 ms — h2https://akj.io/_next/static/chunks/app/layout-e948d7d3f6619452.js/_next/static/chunks/app/layout-e94... https://akj.io/_next/static/chunks/app/layout-e948d7d3f6619452.js — 200 — 10.4 KiB — 154 ms — h2https://akj.io/_next/static/chunks/556-7c949566b273dff2.js/_next/static/chunks/556-7c949566b2... https://akj.io/_next/static/chunks/556-7c949566b273dff2.js — 200 — 37.1 KiB — 203 ms — h2https://akj.io/_next/static/chunks/653-709f478a1f569f20.js/_next/static/chunks/653-709f478a1f... https://akj.io/_next/static/chunks/653-709f478a1f569f20.js — 200 — 5.2 KiB — 180 ms — h2https://akj.io/_next/static/chunks/app/page-1f9faba13fbbbab9.js/_next/static/chunks/app/page-1f9fa... https://akj.io/_next/static/chunks/app/page-1f9faba13fbbbab9.js — 200 — 834 B — 137 ms — h2https://akj.io/_next/static/chunks/app/template-e850b5c49ad03e57.js/_next/static/chunks/app/template-e... https://akj.io/_next/static/chunks/app/template-e850b5c49ad03e57.js — 200 — 1.0 KiB — 139 ms — h2https://akj.io/_next/static/chunks/app/not-found-7a9ebce2dc76a7cf.js/_next/static/chunks/app/not-found-... https://akj.io/_next/static/chunks/app/not-found-7a9ebce2dc76a7cf.js — 200 — 1.7 KiB — 149 ms — h2https://akj.io/icon?40bb0cc575181d92/icon?40bb0cc575181d92 https://akj.io/icon?40bb0cc575181d92 — 200 — 1.0 KiB — 216 ms — h2https://akj.io/posts?_rsc=5CB68i4pnAekjehf/posts?_rsc=5CB68i4pnAekjehf https://akj.io/posts?_rsc=5CB68i4pnAekjehf — 200 — 275 B — 140 ms — h2https://akj.io/about?_rsc=5CB68i4pnAekjehf/about?_rsc=5CB68i4pnAekjehf https://akj.io/about?_rsc=5CB68i4pnAekjehf — 200 — 376 B — 138 ms — h2https://akj.io/work?_rsc=5CB68i4pnAekjehf/work?_rsc=5CB68i4pnAekjehf https://akj.io/work?_rsc=5CB68i4pnAekjehf — 200 — 501 B — 131 ms — h2https://akj.io/work?_rsc=tXyZJ52UQVBCVsD3/work?_rsc=tXyZJ52UQVBCVsD3 https://akj.io/work?_rsc=tXyZJ52UQVBCVsD3 — 200 — 1.4 KiB — 135 ms — h2https://akj.io/about?_rsc=tXyZJ52UQVBCVsD3/about?_rsc=tXyZJ52UQVBCVsD3 https://akj.io/about?_rsc=tXyZJ52UQVBCVsD3 — 200 — 1.3 KiB — 149 ms — h2https://akj.io/posts?_rsc=tXyZJ52UQVBCVsD3/posts?_rsc=tXyZJ52UQVBCVsD3 https://akj.io/posts?_rsc=tXyZJ52UQVBCVsD3 — 200 — 1.2 KiB — 138 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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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