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Performance Optimization Guide

This document outlines the performance optimizations implemented in the Mac Remote Controller website.

Implemented Optimizations

1. Image Optimization

  • Using Astro's built-in Image component for automatic optimization
  • Lazy loading for below-the-fold images
  • Eager loading with high priority for hero images
  • Automatic format conversion (WebP/AVIF when supported)
  • Responsive image sizing

2. JavaScript Optimization

  • Changed client:load to client:idle for non-critical components
  • Components load when browser is idle, not immediately
  • Reduces initial JavaScript bundle size

3. Build Optimizations

  • CSS code splitting enabled
  • Manual chunks for better caching
  • HTML compression enabled
  • Inline stylesheets optimization

4. Resource Hints

  • Preconnect to external domains (Google Play)
  • Preload critical images
  • Optimized viewport meta tag

Performance Best Practices

Image Loading Strategy

Hero Section (Above the fold):

<Image
  loading="eager"
  fetchpriority="high"
/>

Below the fold:

<Image
  loading="lazy"
/>

Component Loading Strategy

Critical (Above the fold):

  • Use client:load for immediate interactivity
  • Example: Navigation menu

Non-critical (Below the fold):

  • Use client:idle - loads when browser is idle
  • Use client:visible - loads when scrolled into view
  • Example: Download buttons, feature cards

Current Loading Strategy

  • Navbar: client:load (needed immediately)
  • Download Buttons: client:idle (can wait)
  • Other sections: Static (no JavaScript needed)

Additional Optimization Opportunities

1. Font Optimization

If adding custom fonts:

<link
  rel="preload"
  href="/fonts/font.woff2"
  as="font"
  type="font/woff2"
  crossorigin
/>

2. Critical CSS

Extract and inline critical CSS for above-the-fold content.

3. Service Worker

Add a service worker for offline support and caching:

bun add @astrojs/service-worker

4. CDN

Deploy to a CDN (Vercel, Netlify, Cloudflare Pages) for global edge caching.

5. Analytics

Use lightweight analytics:

  • Consider privacy-friendly options
  • Load asynchronously
  • Use client:idle directive

Performance Metrics

Target Metrics

  • Lighthouse Score: 90+ (Performance)
  • First Contentful Paint (FCP): < 1.8s
  • Largest Contentful Paint (LCP): < 2.5s
  • Time to Interactive (TTI): < 3.8s
  • Total Blocking Time (TBT): < 200ms
  • Cumulative Layout Shift (CLS): < 0.1

Measuring Performance

  1. Lighthouse (Chrome DevTools)

    • Run Lighthouse audit
    • Check Performance score

  2. WebPageTest

    • Test from multiple locations
    • Check Core Web Vitals

  3. Chrome DevTools Performance Tab

    • Record page load
    • Analyze bottlenecks

Build Commands

# Development (fast refresh)
bun dev

# Production build (optimized)
bun build

# Preview production build
bun preview

Monitoring

Consider adding:

  • Real User Monitoring (RUM)
  • Performance monitoring service
  • Error tracking
  • Analytics

Notes

  • Astro ships zero JavaScript by default
  • Only interactive components need JavaScript
  • Static content is pre-rendered at build time
  • Images are optimized automatically with Astro Image component