How to Fix a Slow WordPress Site: A Developer's Checklist

A slow WordPress site isn't just annoying — it costs you money. Google's Core Web Vitals are a ranking factor. 53% of mobile users leave a page that takes longer than 3 seconds to load. And once they leave, most don't come back. The good news: most WordPress performance problems follow the same patterns. Here's exactly what to check, in order.

1. Check your hosting

Cheap shared hosting is the #1 cause of slow WordPress sites. If your site is on a $3/month plan sharing resources with hundreds of other sites, no amount of optimization will fix it. Run a test: if your Time to First Byte (TTFB) is over 500ms, your hosting is likely the bottleneck. Consider switching to a managed WordPress host or a VPS.

2. Audit your plugins

Every plugin adds code — and some add a lot of it. Deactivate plugins you don't need, and replace heavy plugins with lighter alternatives. A caching plugin (like WP Rocket or Flying Press) and an image optimization plugin (like ShortPixel or Imagify) are the only two most sites genuinely need for performance.

3. Optimize your images

Images are the single largest contributor to page weight on most WordPress sites. Before uploading, resize images to the largest display size they'll actually be used at. Use WebP format instead of JPEG or PNG. Enable lazy loading so off-screen images don't load until the user scrolls to them.

4. Implement caching

Caching stores a static version of your pages so returning visitors don't trigger a full PHP+MySQL request each time. Without it, every page load regenerates from scratch. A good caching plugin can cut your load time by 60-80% with zero visible changes to your site.

5. Use a CDN

A Content Delivery Network serves your static assets (CSS, JS, images) from servers geographically closer to your visitors. If your audience is global, this alone can cut load times in half. Cloudflare offers a generous free tier that's plenty for most sites.

Summary checklist

• Run a TTFB test — over 500ms means upgrade your hosting
• Deactivate every plugin you don't actively need
• Replace heavy plugins with lightweight alternatives where possible
• Convert images to WebP and resize them before upload
• Enable page caching with a quality caching plugin
• Set up a CDN (Cloudflare free tier works well)
• Test with Google PageSpeed Insights or GTmetrix after each change

Work through this list in order, testing after each step. You'll often find that one or two changes — usually hosting or images — account for 80% of the improvement.