Web Performance Tips for 2025

Performance is crucial for user experience and SEO. Here are practical tips to optimize your website.

1. Image Optimization

Use Modern Formats

• Use WebP format for better compression
• Provide fallbacks for older browsers
• Use responsive images with srcset

<picture>
  <source srcset="image.webp" type="image/webp" />
  <source srcset="image.jpg" type="image/jpeg" />
  <img src="image.jpg" alt="Description" />
</picture>

Lazy Loading

<img src="image.jpg" loading="lazy" alt="Description" />

2. Code Splitting & Bundling

• Split JavaScript into smaller chunks
• Load only what’s needed upfront
• Defer non-critical JavaScript

<script src="critical.js"></script>
<script src="non-critical.js" defer></script>

3. Caching Strategies

• Leverage browser caching with proper headers
• Use service workers for offline support
• Implement CDN for static assets

4. CSS Optimization

• Minify and compress CSS
• Remove unused styles
• Use CSS Grid and Flexbox instead of floats

5. Performance Monitoring

Tools to measure performance:

• Google PageSpeed Insights - Overall performance score
• Lighthouse - Comprehensive audit
• WebPageTest - Detailed analysis
• Core Web Vitals - Key metrics

Performance Checklist

• [ ] Images optimized and lazy-loaded
• [ ] CSS minified
• [ ] JavaScript split and deferred
• [ ] Caching headers configured
• [ ] Lighthouse score > 90
• [ ] First Contentful Paint < 1.8s
• [ ] Cumulative Layout Shift < 0.1

Remember: Every millisecond counts! ⚡