Page Speed & Mobile Optimization

Car Dashboard Warning Lights Explained

Core Web Vitals Targets

Largest Contentful Paint (LCP)

Target: < 2.5 seconds Current Estimate: 3.2 seconds Improvement Actions:

Compress hero images to WebP format (60% reduction)
Implement lazy loading for below-fold images
Preload critical CSS and fonts
Use CDN for static assets
Enable browser caching (1 year expiry)

First Input Delay (FID)

Target: < 100 milliseconds Current Estimate: 150 milliseconds Improvement Actions:

Defer non-critical JavaScript
Minify and bundle JavaScript files
Remove unused CSS/JS
Use async loading for third-party scripts
Optimize event listeners

Cumulative Layout Shift (CLS)

Target: < 0.1 Current Estimate: 0.15 Improvement Actions:

Set explicit width/height on all images
Reserve space for ads before loading
Use CSS aspect-ratio for images
Preload web fonts with font-display: swap
Avoid inserting content above existing content

Image Optimization

Compression Strategy

Format Conversion:

Convert all JPEG/PNG to WebP (70% quality)
Use AVIF for supported browsers
Fallback to original format for older browsers

Size Optimization:

Hero images: 1200px width, WebP format
Content images: 800px width, WebP format
Thumbnail images: 300px width, WebP format

Lazy Loading Implementation:

loading="lazy"
width="800"
height="600"
alt="Dashboard warning light example">

CSS & JavaScript Optimization

CSS Optimization

Minification:

Use CSSNano or similar tool
Remove unused CSS with PurgeCSS
Combine media queries

Critical CSS:

Inline critical CSS for above-fold content
Load remaining CSS asynchronously

JavaScript Optimization

Bundling:

Use Webpack or Parcel for bundling
Tree-shaking to remove unused code
Code splitting for route-based loading

Loading Strategy:

Mobile Responsiveness

Mobile-First Design

Viewport Configuration:

Touch Targets:

Minimum 44x44px for interactive elements
Adequate spacing between touch targets

Responsive Images:


sizes="(max-width: 600px) 400px,
(max-width: 1200px) 800px,
1200px"
src="image-800.webp"
alt="Responsive image">

Performance Monitoring

Tools & Metrics

Google PageSpeed Insights:

Mobile score target: 90+
Desktop score target: 95+

Web Vitals Dashboard:

Monitor LCP, FID, CLS in real-time
Set up alerts for regressions

Lighthouse CI:

Automated performance testing
Block deployments on performance regression

Performance Budget

Page Weight Budget:

Total page size: < 2MB
JavaScript: < 500KB
CSS: < 200KB
Images: < 1.2MB
Fonts: < 100KB

Request Budget:

Total requests: < 50
Third-party requests: < 10

Implementation Checklist

[ ] Convert all images to WebP format
[ ] Implement lazy loading for images
[ ] Minify and bundle CSS/JS files
[ ] Set up CDN for static assets
[ ] Configure browser caching
[ ] Implement mobile-first responsive design
[ ] Set up performance monitoring
[ ] Create performance budget