WordPress got Really Slow All of a Sudden – Things to Try
A couple days ago this blog got painfully slow. It was working fine for years and then it just started taking up to five minutes to load a page.
Here is the first thing I tried:
You can try deactivating all of your plugins. If that fixes it then go reactivate your plugins one by one testing your site each time to determine which one is the culprit.
In my case plugins weren’t the issue. Somehow my theme had started making it slow (no idea how!). So I switched to a new theme and everything got better.