WordPress Speed Optimization Checklist (2026)

Published April 21, 2026

WordPress Speed Optimization Checklist

Site speed directly affects your rankings, bounce rate, and conversions. Google's Core Web Vitals make performance a ranking signal. Use this checklist to systematically eliminate every speed bottleneck.

Hosting and Server

Choose hosting that uses PHP 8.3+ (FrankenPHP delivers the best PHP performance available)
Enable HTTP/2 for parallel asset loading
Use a server close to your primary audience
Ensure your plan includes adequate CPU and memory — SiteICO's plans are sized for real WordPress workloads

Caching

Enable full-page caching (WP Rocket, W3 Total Cache, or server-level caching)
Enable object caching with Redis or Memcached
Set browser cache headers (1 year for static assets)
Enable Gzip or Brotli compression

Images

Convert images to WebP format
Enable lazy loading for below-the-fold images
Set explicit width and height attributes to prevent layout shift
Use a CDN to serve images from edge locations
Compress images before uploading (target under 150KB for blog images)

CSS and JavaScript

Minify CSS and JavaScript files
Combine files where possible to reduce HTTP requests
Defer non-critical JavaScript
Remove unused CSS with tools like PurgeCSS
Eliminate render-blocking resources above the fold

Database

Delete post revisions older than 30 days
Clean up transients and expired options
Optimize database tables monthly
Limit post revisions to 5 per post in wp-config.php

Plugins and Theme

Deactivate and delete unused plugins
Switch to a lightweight theme (Astra, GeneratePress, Kadence)
Test each plugin's impact on load time with Query Monitor
Replace heavy plugins with code snippets where possible

Measuring Results

After each change, test with Google PageSpeed Insights, GTmetrix, or WebPageTest. Target a Largest Contentful Paint under 2.5 seconds and a Time to First Byte under 800ms. SiteICO's performance dashboard shows real-time metrics so you can track improvements over time.