Use progressive JPEG encoding

Progressive JPEGs display a low-quality preview immediately rather than loading line-by-line—users see something faster, improving perceived performance even if total load time is similar.

Quick Reference

• Progressive JPEGs show blurry preview immediately, then sharpen
• Better perceived performance than baseline JPEGs that load top-to-bottom
• Similar file size to baseline JPEG (sometimes slightly smaller)
• Less relevant with modern formats (WebP, AVIF) but still useful for fallbacks

Check

Check if JPEG images are saved in progressive format for better perceived performance.

Fix

Convert baseline JPEGs to progressive format for improved loading experience.