How to speed up a WordPress website in three steps

Executive overview

Slow WordPress sites hurt both rankings and revenue. Google has used page speed as a ranking signal since 2010, and bounce rate climbs directly with load time.

Three changes — faster DNS, a caching/optimisation plugin, and image compression — can take a site from a mobile PageSpeed score of 45 to 95 and cut load time from 1.72 seconds to 200 milliseconds.

The fastest gains come from switching DNS, enabling WP Rocket, and compressing images — in that order.

Step 1: switch to Cloudflare DNS

• Free DNS from domain registrars is typically slow; Cloudflare's free DNS responds faster.
• Sign up for Cloudflare, add your site, confirm DNS records, then update nameservers at your registrar.
• Change propagates without touching your server or files.

Step 2: install and configure WP Rocket

• WP Rocket is a paid all-in-one WordPress speed plugin; handles caching, minification, compression, and lazy loading.
• Enable mobile caching if the site is responsive.
• Minification strips whitespace and comments from HTML, CSS, and JS — reduces file size without changing behaviour.
• Combining CSS/JS files helps on HTTP 1.1 (files load consecutively); less impactful on HTTP 2 (files load concurrently). Use KeyCDN's tester to check which protocol your server uses.
• Enable CSS delivery optimisation to generate above-the-fold CSS and load remaining CSS asynchronously — fixes render-blocking CSS.
• Remove jQuery Migrate if no theme or plugin requires it.
• Enable defer JS loading — delays JS so HTML and CSS reach the visitor first; fixes most render-blocking JS warnings in PageSpeed Insights.
• Test thoroughly after enabling minify, combine, or defer JS — these settings can break site functionality.
• Lazy load defers images and videos until they scroll into view; built into WordPress 5.5+ by default.
• Preloading lets you declare high-priority resources so the browser loads them before lower-priority scripts.
• If your audience is global, enable a CDN (Content Delivery Network) to serve files from servers closest to each visitor.

Step 3: optimise images

• Lazy loading helps images below the fold; featured images above the fold still need to be small at load time.
• Use a plugin like ShortPixel or Imagify to compress images with lossy or lossless compression.
• ShortPixel can also convert images to WebP format, which achieves further size reduction with minimal quality loss.
• Enable the "create WebP version" option under ShortPixel's Advanced settings.

Results and caveats

• After all three steps: mobile PageSpeed score 45 → 95; desktop 79 → near perfect.
• Pingdom load time: 1.72 s → 200 ms; page size: 1.7 MB → ~900 KB; requests: 63 → ~21.
• Every page on the site loaded in under one second on a follow-up Ahrefs Site Audit crawl.
• Results vary — a heavy theme, resource-intensive plugins, poor hosting, or many third-party tracking scripts can limit gains.
• If speed is still poor after these steps, consider removing plugins, switching themes, or hiring a developer.