Performance guide

How to Speed Up WordPress and Pass Core Web Vitals

By Gander Web · Updated 11 October 2026 · 2 min read

Google uses page speed (Core Web Vitals: LCP, INP and CLS) as a ranking signal. Work through these in order of impact.

1. Start with fast hosting and a good TTFB

No plugin can fix a slow server. Your Time To First Byte (TTFB) should be under ~200ms for UK visitors. If it isn't, you're on overloaded shared hosting or a server far from your audience. UK-based LiteSpeed hosting is the single biggest win for a UK business.

2. Add a caching layer

Caching serves a pre-built copy of each page instead of rebuilding it from the database every visit. If your host runs LiteSpeed, install LiteSpeed Cache (free); otherwise WP Rocket or W3 Total Cache. Enable page caching, browser caching and GZIP/Brotli compression.

3. Optimise your images

Images are usually the heaviest part of a page. Resize them to the size they display at, serve them as WebP or AVIF, and enable lazy-loading so off-screen images load only when needed. A plugin like ShortPixel or Imagify automates this.

4. Cut the bloat

Every plugin adds code. Audit your plugins and remove anything unused. Use a tool such as Asset CleanUp or Perfmatters to stop scripts/styles loading on pages that don't need them. Choose a lightweight theme over a do-everything one.

5. Use a CDN

A content delivery network (e.g. Cloudflare) caches static files on servers around the world and absorbs traffic spikes. It also shortens the distance between your files and faraway visitors.

6. Measure, don't guess

Test with PageSpeed Insights and WebPageTest before and after each change so you know what helped. Go by real-world (field) data rather than lab scores alone.

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