Why Is My Website So Slow? 7 Real Causes (And How to Check Which One You Have)

"My website is slow" is a symptom, not a diagnosis. The fix looks completely different depending on which of a handful of actual causes is behind it — and it's worth spending ten minutes finding out which one you actually have before paying anyone to "optimise" anything.

Check your images first

Open your homepage, right-click, choose Inspect, go to the Network tab, and reload the page. Sort by file size. If a single image is several megabytes, that's very likely your biggest problem — and the cheapest one to fix.

Count your third-party scripts

Chat widgets, multiple analytics tools, marketing pixels, embedded social widgets — each one adds its own loading and execution cost. Five or six of these stacked on a single page adds up fast, especially on a phone.

Consider your hosting

If images and scripts are already lean but the page still crawls, the delay might be happening before your code even runs. It's worth checking your host's own status page, or just asking their support if there are known issues on your plan.

Look for render-blocking resources

CSS or JavaScript that loads before the page can display anything forces a visitor to stare at a blank screen. This one's a code-structure issue rather than a content issue, and it usually needs a developer to actually fix.

Check whether you're caching at all

If every visitor's request travels all the way to your server with nothing cached for repeat visitors, you're paying the full network cost every single time, for every single person.

The honest next step is running your site through PageSpeed Insights — free, at pagespeed.web.dev. It doesn't just hand you a score, it lists the specific issues it found, which tells you exactly which of the above you're actually dealing with instead of guessing.