Why Images Are the Biggest Performance Problem
Images typically account for 50–80% of a webpage's total download size. Even a 1-second delay in page load time reduces conversions by 7% and bounces increase dramatically on mobile.
Step 1: Choose the Right Format
Use WebP for all web images — it's 25–35% smaller than JPEG at equivalent quality and is supported by all modern browsers. Fall back to JPEG for browsers that don't support it (rare in 2026).
Step 2: Compress Before Uploading
Use FreeMediaKit's Image Compressor to compress images before they ever hit your server. Target: photos under 150 KB, thumbnails under 60 KB.
Step 3: Serve the Right Size
Don't serve a 2000px image in a 400px slot. Use the HTML srcset attribute to serve different sizes to different screen widths:
<img srcset="small.webp 480w, medium.webp 800w" sizes="(max-width: 600px) 480px, 800px" src="medium.webp">
Step 4: Lazy Load Below-the-Fold Images
Add loading="lazy" to any image that isn't visible immediately on page load. Browsers handle the rest natively.
Step 5: Use a CDN
A Content Delivery Network (Cloudflare, Bunny.net, Fastly) serves images from servers physically close to each visitor, cutting latency dramatically. Cloudflare's free tier covers most small sites.
Measuring Your Score
Use Google PageSpeed Insights or WebPageTest.org to get a baseline and track improvements after each change.