Skip to content
https://costdown.org

Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
97
GRADE
A+
FIX
1
REVIEW
1
PASS
21
INFO
2

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

Mobile Desktop
62
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.
91
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.

2.66 s

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

5.15 s

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

445 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.

4.99 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.

5.16 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
21 PASS 1 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
C
JS Execution Cost
Action
1686ms total JS execution
REVIEW
1686ms total JS execution
Warning::
https://costdown.org/: 570ms CPU time
Warning::
Unattributable: 346ms CPU time
Warning::
https://costdown.org/_next/static/chunks/webpack-a...: 305ms CPU time
Warning::
https://costdown.org/_next/static/chunks/1255-fc6c...: 255ms CPU time
Info::
https://costdown.org/_next/static/chunks/4bd1b696-...: 114ms CPU time

Main Thread Breakdown

Script Evaluation 37% Style & Layout 25% Other 22% Script Parsing & Compilation 12%
ScriptTotalScriptingParse/CompileParty
https://costdown.org/570ms30ms23ms1st
Unattributable346ms23ms0ms1st
https://costdown.org/_next/static/chunks/webpack-acb34275d54b1fbc.js305ms303ms1ms1st
https://costdown.org/_next/static/chunks/1255-fc6c00ab2f765339.js255ms215ms34ms1st
https://costdown.org/_next/static/chunks/4bd1b696-f785427dddbba9fb.js114ms43ms49ms1st
https://costdown.org/_next/static/chunks/8009-3f143f2ef12c5b60.js96ms1ms94ms1st
A+
Page Weight Budget
559 KB transferred, 25 requests
PASS
559 KB transferred, 25 requests
Info::
Page weighs 1.3 MB (559 KB transferred)
Info::
Fonts are 216 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 216 KB
Info::
25 HTTP requests
Info::
Estimated 0.11 g CO2 per page load
559 KB / 2.4 MB budget
559 KB transferred
25 requests
0.11 g CO2 per page load
JavaScript 298.2 KiB 53%
Fonts 216.5 KiB 39%
HTML 15.8 KiB 3%
Images 10.1 KiB 2%
CSS 8.9 KiB 2%
Other 6.0 KiB 1%
Other 3.5 KiB 1%
Other 459 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
2% third-party, 0 ms blocking
PASS
2% third-party, 0 ms blocking
Info::
Third-party code accounts for 2% of page weight (11.3 KiB of 559.4 KiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-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
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 10 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
6 fonts (216 KB)
PASS
6 fonts (216 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

216 KB total

Render-blocking

0

of 6

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 4.0 s 5.0 s FCP 2.7 s LCP 5.1 shttps://costdown.org/_next/static/media/62c97acc3aa63787-s.p.woff262c97acc3aa63787-s.p.woff2 https://costdown.org/_next/static/media/62c97acc3aa63787-s.p.woff2 — 12.5 KiB — 42 ms — font-display: swaphttps://costdown.org/_next/static/media/8e9860b6e62d6359-s.p.woff28e9860b6e62d6359-s.p.woff2 https://costdown.org/_next/static/media/8e9860b6e62d6359-s.p.woff2 — 84.4 KiB — 43 ms — font-display: swaphttps://costdown.org/_next/static/media/bb3ef058b751a6ad-s.p.woff2bb3ef058b751a6ad-s.p.woff2 https://costdown.org/_next/static/media/bb3ef058b751a6ad-s.p.woff2 — 40.6 KiB — 41 ms — font-display: swaphttps://costdown.org/_next/static/media/e4af272ccee01ff0-s.p.woff2e4af272ccee01ff0-s.p.woff2 https://costdown.org/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 48.4 KiB — 41 ms — font-display: swaphttps://costdown.org/_next/static/media/df0a9ae256c0569c-s.woff2df0a9ae256c0569c-s.woff2 https://costdown.org/_next/static/media/df0a9ae256c0569c-s.woff2 — 11.1 KiB — 19 ms — font-display: swaphttps://costdown.org/_next/static/media/21350d82a1f187e9-s.woff221350d82a1f187e9-s.woff2 https://costdown.org/_next/static/media/21350d82a1f187e9-s.woff2 — 19.4 KiB — 19 ms — font-display: swap
62c97acc3aa63787-s.p.woff2 woff2 swap
Size 12 KB
Load time 42 ms
Start 194 ms
Risk FOUT — text flashes from fallback to web font
8e9860b6e62d6359-s.p.woff2 woff2 swap
Size 84 KB
Load time 43 ms
Start 195 ms
Risk FOUT — text flashes from fallback to web font
bb3ef058b751a6ad-s.p.woff2 woff2 swap
Size 41 KB
Load time 41 ms
Start 198 ms
Risk FOUT — text flashes from fallback to web font
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 41 ms
Start 199 ms
Risk FOUT — text flashes from fallback to web font
df0a9ae256c0569c-s.woff2 woff2 swap
Size 11 KB
Load time 19 ms
Start 897 ms
Risk FOUT — text flashes from fallback to web font
21350d82a1f187e9-s.woff2 woff2 swap
Size 19 KB
Load time 19 ms
Start 897 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
11 scripts, 0 KB unused
PASS
11 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://costdown.org/_next/static/chunks/webpack-acb34275d54b1fbc.js3 KB—✓1st
https://costdown.org/_next/static/chunks/4bd1b696-f785427dddbba9fb.js54 KB—✓1st
https://costdown.org/_next/static/chunks/1255-fc6c00ab2f765339.js47 KB—✓1st
https://costdown.org/_next/static/chunks/main-app-05a5fe279f4f6e20.js1 KB—✓1st
https://costdown.org/_next/static/chunks/2619-3c9e02e22d10480a.js4 KB—✓1st
https://costdown.org/_next/static/chunks/8009-3f143f2ef12c5b60.js149 KB—✓1st
https://costdown.org/_next/static/chunks/2337-8f491b67f44c9a7e.js4 KB—✓1st
https://costdown.org/_next/static/chunks/app/%5Blang%5D/layout-14818b6ebdbdb427.js4 KB—✓1st
https://costdown.org/_next/static/chunks/5905-8122912d4be580e7.js20 KB—✓1st
https://costdown.org/_next/static/chunks/app/%5Blang%5D/page-778be06fec310a48.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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
—
preload
5
dns-prefetch
—
prefetch
—

5 resource hints configured

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+
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-Timing Observability
3 Server-Timing entries advertised
PASS
3 Server-Timing entries advertised
Info::
Server-Timing header advertises 3 timing entries
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
25 resources · 559 KB · 0 KB savings available
PASS
25 resources · 559 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 559 KB
Info::
1 third-party resources (2% of weight)
25 resources · 559.4 KiB · 1 third-party Within 1MB page-weight target
JavaScript 53% · 298.2 KiB
Font 39% · 216.5 KiB
Image 3% · 16.1 KiB
Document 3% · 15.8 KiB
CSS 2% · 8.9 KiB
Other 1% · 4.0 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
1 JS blocking issue(s) detected
PASS
1 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.
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
25 requests over 1524ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.7 s LCP 5.1 shttps://costdown.org// https://costdown.org/ — 200 — 15.8 KiB — 295 ms — h3https://costdown.org/_next/static/media/62c97acc3aa63787-s.p.woff2/_next/static/media/62c97acc3aa6378... https://costdown.org/_next/static/media/62c97acc3aa63787-s.p.woff2 — 200 — 12.5 KiB — 42 ms — h3https://costdown.org/_next/static/media/8e9860b6e62d6359-s.p.woff2/_next/static/media/8e9860b6e62d635... https://costdown.org/_next/static/media/8e9860b6e62d6359-s.p.woff2 — 200 — 84.4 KiB — 43 ms — h3https://costdown.org/_next/static/media/bb3ef058b751a6ad-s.p.woff2/_next/static/media/bb3ef058b751a6a... https://costdown.org/_next/static/media/bb3ef058b751a6ad-s.p.woff2 — 200 — 40.6 KiB — 41 ms — h3https://costdown.org/_next/static/media/e4af272ccee01ff0-s.p.woff2/_next/static/media/e4af272ccee01ff... https://costdown.org/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 48.4 KiB — 41 ms — h3https://costdown.org/_next/static/css/dddc611bbf1fb327.css/_next/static/css/dddc611bbf1fb327.... https://costdown.org/_next/static/css/dddc611bbf1fb327.css — 200 — 8.9 KiB — 481 ms — h3https://costdown.org/logo-128.png/logo-128.png https://costdown.org/logo-128.png — 200 — 10.1 KiB — 454 ms — h3https://costdown.org/_next/static/chunks/webpack-acb34275d54b1fbc.js/_next/static/chunks/webpack-acb342... https://costdown.org/_next/static/chunks/webpack-acb34275d54b1fbc.js — 200 — 3.0 KiB — 34 ms — h3https://costdown.org/_next/static/chunks/4bd1b696-f785427dddbba9fb.js/_next/static/chunks/4bd1b696-f7854... https://costdown.org/_next/static/chunks/4bd1b696-f785427dddbba9fb.js — 200 — 54.2 KiB — 68 ms — h3https://costdown.org/_next/static/chunks/1255-fc6c00ab2f765339.js/_next/static/chunks/1255-fc6c00ab2... https://costdown.org/_next/static/chunks/1255-fc6c00ab2f765339.js — 200 — 46.5 KiB — 83 ms — h3https://costdown.org/_next/static/chunks/main-app-05a5fe279f4f6e20.js/_next/static/chunks/main-app-05a5f... https://costdown.org/_next/static/chunks/main-app-05a5fe279f4f6e20.js — 200 — 1.3 KiB — 50 ms — h3https://costdown.org/_next/static/chunks/2619-3c9e02e22d10480a.js/_next/static/chunks/2619-3c9e02e22... https://costdown.org/_next/static/chunks/2619-3c9e02e22d10480a.js — 200 — 4.4 KiB — 46 ms — h3https://costdown.org/_next/static/chunks/8009-3f143f2ef12c5b60.js/_next/static/chunks/8009-3f143f2ef... https://costdown.org/_next/static/chunks/8009-3f143f2ef12c5b60.js — 200 — 148.7 KiB — 85 ms — h3https://costdown.org/_next/static/chunks/2337-8f491b67f44c9a7e.js/_next/static/chunks/2337-8f491b67f... https://costdown.org/_next/static/chunks/2337-8f491b67f44c9a7e.js — 200 — 3.9 KiB — 452 ms — h3https://costdown.org/_next/static/chunks/app/%5Blang%5D/layout-14818b6ebdbdb427.js/_next/static/chunks/app/%5Blang%5D... https://costdown.org/_next/static/chunks/app/%5Blang%5D/layout-14818b6ebdbdb427.js — 200 — 3.5 KiB — 458 ms — h3https://costdown.org/_next/static/chunks/5905-8122912d4be580e7.js/_next/static/chunks/5905-8122912d4... https://costdown.org/_next/static/chunks/5905-8122912d4be580e7.js — 200 — 19.9 KiB — 81 ms — h3https://costdown.org/_next/static/chunks/app/%5Blang%5D/page-778be06fec310a48.js/_next/static/chunks/app/%5Blang%5D... https://costdown.org/_next/static/chunks/app/%5Blang%5D/page-778be06fec310a48.js — 200 — 1.3 KiB — 65 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e1781791509496static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e1781791509496 — 200 — 11.3 KiB — 44 ms — h2https://costdown.org/_next/static/media/df0a9ae256c0569c-s.woff2/_next/static/media/df0a9ae256c0569... https://costdown.org/_next/static/media/df0a9ae256c0569c-s.woff2 — 200 — 11.1 KiB — 19 ms — h3https://costdown.org/_next/static/media/21350d82a1f187e9-s.woff2/_next/static/media/21350d82a1f187e... https://costdown.org/_next/static/media/21350d82a1f187e9-s.woff2 — 200 — 19.4 KiB — 19 ms — h3https://costdown.org/cdn-cgi/rum?/cdn-cgi/rum? https://costdown.org/cdn-cgi/rum? — 204 — 459 B — 8 ms — h3https://costdown.org/favicon.ico/favicon.ico https://costdown.org/favicon.ico — 200 — 6.0 KiB — 121 ms — h3https://costdown.org/login?_rsc=XSA5kkUCbk8ea1m8/login?_rsc=XSA5kkUCbk8ea1m8 https://costdown.org/login?_rsc=XSA5kkUCbk8ea1m8 — 200 — 1.2 KiB — 162 ms — h3https://costdown.org/register?_rsc=XSA5kkUCbk8ea1m8/register?_rsc=XSA5kkUCbk8ea1m8 https://costdown.org/register?_rsc=XSA5kkUCbk8ea1m8 — 200 — 1.1 KiB — 159 ms — h3https://costdown.org/write?_rsc=XSA5kkUCbk8ea1m8/write?_rsc=XSA5kkUCbk8ea1m8 https://costdown.org/write?_rsc=XSA5kkUCbk8ea1m8 — 200 — 1.2 KiB — 159 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
1 images, 9 KB total, 9 KB wasted
INFO

Image Optimization Audit

Total Images

1

Total Size

9 KB

Oversized

1

Wasted

9 KB

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback