Before changing anything, find out what is slow. The fixes are different and some make things worse.
Is it slow for everyone, or just for you?
Try it from your phone on mobile data. If it is fast there, the problem is your own network or your browser, not the site. This is worth thirty seconds and it rules out the commonest cause of a slowness report.
Is it the first page or every page?
The usual causes, in the order they actually occur
- A plugin doing work on every page load. Related-posts widgets, live currency converters
and anything calling an external API are the repeat offenders.
- Caching turned off or not working. Check your site's performance settings.
- An external service the page waits for. A slow third-party script blocks the page even
though your server answered immediately.
- Genuinely too much traffic for the plan. Real, but far rarer than people expect.
What NOT to do
Do not install a second caching plugin. Two caching layers fighting is a classic cause of pages that are slow and serve stale content, and it is much harder to diagnose afterwards than the original problem.
Opening a ticket
Give us one URL that is slow and roughly when you noticed. A single slow page we can measure is worth more than a general report - and if only one page is slow, that itself is the biggest clue about the cause.