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Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
95
GRADE
A
FIX
0
REVIEW
7
PASS
16
INFO
2

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

Mobile Desktop
95
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
77
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.

1.38 s

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

2.57 s

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

126 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.

2.66 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.

2.57 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
712ms total JS execution
REVIEW
712ms total JS execution
Warning::
https://btcminex.com/_next/static/chunks/2khxl0v1q...: 442ms CPU time
Info::
Unattributable: 142ms CPU time
Info::
https://btcminex.com/: 74ms CPU time
Info::
https://btcminex.com/_next/static/chunks/1zj_tkyes...: 54ms CPU time

Main Thread Breakdown

Script Evaluation 56% Other 20% Script Parsing & Compilation 12% Style & Layout 10%
ScriptTotalScriptingParse/CompileParty
https://btcminex.com/_next/static/chunks/2khxl0v1q4i6n.js442ms374ms18ms1st
Unattributable142ms20ms0ms1st
https://btcminex.com/74ms7ms5ms1st
https://btcminex.com/_next/static/chunks/1zj_tkyesqjcr.js54ms29ms14ms1st
B
JS Bundles
12 scripts, 77 KB unused
REVIEW
12 scripts, 77 KB unused
Warning::
https://btcminex.com/_next/static/chunks/3sd-tblx5...: 55 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://btcminex.com/_next/static/chunks/2khxl0v1q...: 22 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 77 KB
77 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://btcminex.com/_next/static/chunks/3sd-tblx53csz.js66 KB55 KB (82%)✓1st
https://btcminex.com/_next/static/chunks/2khxl0v1q4i6n.js70 KB22 KB (32%)✓1st
https://btcminex.com/_next/static/chunks/1x6obpmlu1_c2.js2 KB—✓1st
https://btcminex.com/_next/static/chunks/1-nqmp1rl8kqt.js9 KB—✓1st
https://btcminex.com/_next/static/chunks/1zj_tkyesqjcr.js44 KB—✓1st
https://btcminex.com/_next/static/chunks/turbopack-3-ry682tkyiqk.js4 KB—✓1st
https://btcminex.com/_next/static/chunks/0_9k7v6e6qlhl.js4 KB—✓1st
https://btcminex.com/_next/static/chunks/1de8cc-ye8ywp.js6 KB—✓1st
https://btcminex.com/_next/static/chunks/29017sj3i6d24.js4 KB—✓1st
https://btcminex.com/_next/static/chunks/0hhkxzd1lfesf.js18 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

B
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
B
Main HTML Cache-Control
Cache-Control present but without max-age
REVIEW
Cache-Control present but without max-age
Info::
Main HTML Cache-Control has no max-age: s-maxage=31536000
Got: s-maxage=31536000
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
s-maxage=31536000
REVIEW
s-maxage=31536000
Info::
Cache-Control header is set
Got: s-maxage=31536000
Info::
CDN TTL: 52 weeks (s-maxage=31536000)
Info::
ETag present — enables conditional (304) responses
Cache-Control

s-maxage=31536000

DirectiveValueMeaning
s-maxage31536000CDN caches for 52 weeks
A+
Page Weight Budget
278 KB transferred, 21 requests
PASS
278 KB transferred, 21 requests
Info::
Page weighs 991 KB (278 KB transferred)
Info::
21 HTTP requests
Info::
Estimated 0.06 g CO2 per page load
278 KB / 2.4 MB budget
278 KB transferred
21 requests
0.06 g CO2 per page load
JavaScript 243.3 KiB 87%
CSS 14.7 KiB 5%
Other 11.3 KiB 4%
HTML 4.6 KiB 2%
Other 3.1 KiB 1%
Other 1.3 KiB 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
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
—
prefetch
—

1 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+
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+
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
21 resources · 278 KB · 77 KB savings available
PASS
21 resources · 278 KB · 77 KB savings available
Info::
Within 1MB page-weight target
Got: 278 KB
Info::
~77 KB of savings available
21 resources · 278.2 KiB · 0 third-party Within 1MB page-weight target
JavaScript 87% · 243.3 KiB
CSS 5% · 14.7 KiB
Other 5% · 12.5 KiB
Document 2% · 4.6 KiB
Image 1% · 3.1 KiB

~76.8 KiB of savings available

Remove unused JavaScript: 76.8 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::
3 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
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
21 requests over 1835ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.4 s LCP 2.6 shttps://btcminex.com// https://btcminex.com/ — 200 — 4.6 KiB — 187 ms — h2https://btcminex.com/_next/static/chunks/0qki2nlndkvvf.css/_next/static/chunks/0qki2nlndkvvf.... https://btcminex.com/_next/static/chunks/0qki2nlndkvvf.css — 200 — 14.7 KiB — 343 ms — h2https://btcminex.com/_next/static/chunks/1x6obpmlu1_c2.js/_next/static/chunks/1x6obpmlu1_c2.... https://btcminex.com/_next/static/chunks/1x6obpmlu1_c2.js — 200 — 2.1 KiB — 167 ms — h2https://btcminex.com/_next/static/chunks/1-nqmp1rl8kqt.js/_next/static/chunks/1-nqmp1rl8kqt.... https://btcminex.com/_next/static/chunks/1-nqmp1rl8kqt.js — 200 — 8.6 KiB — 239 ms — h2https://btcminex.com/_next/static/chunks/2khxl0v1q4i6n.js/_next/static/chunks/2khxl0v1q4i6n.... https://btcminex.com/_next/static/chunks/2khxl0v1q4i6n.js — 200 — 70.5 KiB — 430 ms — h2https://btcminex.com/_next/static/chunks/1zj_tkyesqjcr.js/_next/static/chunks/1zj_tkyesqjcr.... https://btcminex.com/_next/static/chunks/1zj_tkyesqjcr.js — 200 — 44.2 KiB — 241 ms — h2https://btcminex.com/_next/static/chunks/turbopack-3-ry682tkyiqk.js/_next/static/chunks/turbopack-3-ry... https://btcminex.com/_next/static/chunks/turbopack-3-ry682tkyiqk.js — 200 — 4.0 KiB — 233 ms — h2https://btcminex.com/_next/static/chunks/0_9k7v6e6qlhl.js/_next/static/chunks/0_9k7v6e6qlhl.... https://btcminex.com/_next/static/chunks/0_9k7v6e6qlhl.js — 200 — 4.3 KiB — 237 ms — h2https://btcminex.com/_next/static/chunks/3sd-tblx53csz.js/_next/static/chunks/3sd-tblx53csz.... https://btcminex.com/_next/static/chunks/3sd-tblx53csz.js — 200 — 66.4 KiB — 339 ms — h2https://btcminex.com/_next/static/chunks/1de8cc-ye8ywp.js/_next/static/chunks/1de8cc-ye8ywp.... https://btcminex.com/_next/static/chunks/1de8cc-ye8ywp.js — 200 — 5.8 KiB — 329 ms — h2https://btcminex.com/_next/static/chunks/29017sj3i6d24.js/_next/static/chunks/29017sj3i6d24.... https://btcminex.com/_next/static/chunks/29017sj3i6d24.js — 200 — 4.3 KiB — 169 ms — h2https://btcminex.com/_next/static/chunks/0hhkxzd1lfesf.js/_next/static/chunks/0hhkxzd1lfesf.... https://btcminex.com/_next/static/chunks/0hhkxzd1lfesf.js — 200 — 18.3 KiB — 337 ms — h2https://btcminex.com/manifest.webmanifest/manifest.webmanifest https://btcminex.com/manifest.webmanifest — 200 — 665 B — 167 ms — h3https://btcminex.com/favicon.ico/favicon.ico https://btcminex.com/favicon.ico — 200 — 3.1 KiB — 174 ms — h3https://btcminex.com/login?_rsc=FhzSgLhrJVPy6BDs/login?_rsc=FhzSgLhrJVPy6BDs https://btcminex.com/login?_rsc=FhzSgLhrJVPy6BDs — 200 — 3.6 KiB — 167 ms — h3https://btcminex.com/login?_rsc=FhzSgLhrJVPy6BDs/login?_rsc=FhzSgLhrJVPy6BDs https://btcminex.com/login?_rsc=FhzSgLhrJVPy6BDs — 200 — 3.6 KiB — 333 ms — h3https://btcminex.com/_next/static/chunks/0yf_gc1r9geo0.js/_next/static/chunks/0yf_gc1r9geo0.... https://btcminex.com/_next/static/chunks/0yf_gc1r9geo0.js — 200 — 7.2 KiB — 169 ms — h3https://btcminex.com/manifest.webmanifest/manifest.webmanifest https://btcminex.com/manifest.webmanifest — 200 — 629 B — 161 ms — h3https://btcminex.com/register?_rsc=_H_fFy2_Q06N8BA7/register?_rsc=_H_fFy2_Q06N8BA7 https://btcminex.com/register?_rsc=_H_fFy2_Q06N8BA7 — 200 — 611 B — 169 ms — h3https://btcminex.com/register?_rsc=4CX9Kx2ops_BzLX1/register?_rsc=4CX9Kx2ops_BzLX1 https://btcminex.com/register?_rsc=4CX9Kx2ops_BzLX1 — 200 — 3.5 KiB — 163 ms — h3https://btcminex.com/_next/static/chunks/3l51ty9lq7k89.js/_next/static/chunks/3l51ty9lq7k89.... https://btcminex.com/_next/static/chunks/3l51ty9lq7k89.js — 200 — 7.6 KiB — 165 ms — h3
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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