A very quick tip: optimise your WordPress installation without a plugin.

1. Login.

Login to your cPanel and navigate to phpMyAdmin.

2. Select.

Select your database, and then for the table checkboxes, at the bottom select ‘Check All’.

3. Optimise.

Slightly off-centre there’s a box that says ‘With selected’. Click it and select ‘Optimize table’ from the drop-down menu. And you’re done. The image below shows the last step.