Step 1: Delete Unnecessary Stuffs
The very first step is to delete all unnecessary or unused stuffs on your website. Some examples are listed below:
- Unused plugins
- Unused themes
- Unused images
- Trash posts, pages & comments
Although you may not see some obvious improvements after doing this step, it's still necessary to get rid of the things you're not using. Some themes and plugins may have a huge file size which will lead to a long loading time for your website/page.
Disallow Trackbacks & Pingbacks!
Apart from deleting unused stuffs, you should also disallow trackbacks & pingbacks for every post and page.
I don't know the exact principle behind this but I've seen a lot of people recommending to turn off trackbacks & pingbacks as a way to improve your site speed. You can search online for this.
To edit your post settings on trackbacks & pingbacks, go to each of your post edit page and scroll down to the "Discussion" setting area.
(If you can't find this area, scroll to the top and open "screen options" at the top right corner. Check the "Discussion" box then you'll see this setting area.)
To change the trackbacks setting for all your future posts, go to your WordPress Dashboard > Settings > Discussion and un-check the "Allow link notifications from other blogs".
Next Page: Resize All Your Uploaded Images (Step 2)