Website performance & speed, explained

A slow website costs you visitors, customers, and search rankings. This section explains what page speed really means, why it matters for your business, and what you and your team can do about it, in plain English.

Come here when your site feels sluggish, when someone sends you a scary-looking speed score, or before you add something heavy like a video, a new plugin, or a page full of photos. If your site is slow right now and you want a symptom-first checklist, start with My site is slow.

If you only read three things

Why website speed matters: the business case.
What slows websites down: diagnose before you fix.
Images & page speed: usually the highest-impact win.

Why speed matters

Why website speed matters

How a slow site affects your visitors, your revenue, and your Google ranking.

What is page speed?

A plain-English explanation of what 'page speed' actually means.

Core Web Vitals explained

Google's three measurements of loading, responsiveness and visual stability, and what they mean for you.

How to measure your site's speed

Free tools to check how fast your site is right now.

What slows sites down

What slows websites down

The most common causes of a slow site, ranked by impact.

Images & page speed

Why images are often the biggest culprit, and how to fix them.

How plugins affect speed

More plugins doesn't always mean more problems, but it can.

Fonts & page speed

How web fonts slow things down and what you can do about it.

Improving speed

Caching explained

How a saved copy of your page makes your site faster for every visitor.

Cache plugins explained

WP Rocket, WP-Optimize and Autoptimize compared.

How a CDN speeds up your site

What a Content Delivery Network does and why it helps.

How hosting affects speed

Why your choice of host has a huge impact on performance.

Mobile performance explained

Why mobile speed is different, and why it matters more than ever.

Reference

Performance: realistic expectations

What a good score looks like, and why perfect scores aren't the goal.

Website performance checklist

A practical checklist for keeping your site fast.

Performance terms, explained simply

A plain-English glossary of speed and performance jargon.

When speed becomes a problem

My site is slow

The symptom-first checklist when pages are crawling today.

My changes aren't showing up

Usually caching doing its job. Here's how to clear it safely.

How to clear your cache & hard refresh

The 30-second fix to try before anything else.

What to check on your site monthly

Keep speed from creeping back up over time.