How to Reduce Website Load Time: A Complete Image Optimization Guide

Website speed affects user experience, rankings, and conversions. Images account for 50-80% of page weight, making optimization the most impactful improvement.

Image Formats

JPEG excels at photographs. PNG handles transparency. WebP reduces sizes 25-35% versus older formats. AVIF offers even better compression. Choosing the right format is foundational.

Compression

JPEG at 85% quality looks identical to 100% yet is 50-70% smaller. Finding the sweet spot where size drops without visible degradation is key to effective optimization.

Responsive Images and Lazy Loading

Srcset lets browsers choose optimal sizes cutting mobile transfer by 50%. Native lazy loading defers off-screen images improving initial load with zero JavaScript.

Getting Started

Audit largest images. Convert to WebP. Resize to display dimensions. Enable lazy loading. These steps reduce page weight 40-60%.