WP Super Cache is a decent cache’ing solution for WordPress, but I couldn’t get the preload function to work on a VPS — it wouldn’t even start. What the preload function does is it pre-caches all the posts, tags, and so on, to make everything faster (in short).

The first thing to do is to turn off wp-cron. You’ll need to edit the wp-config.php file on your server and add or change the following:

define('DISABLE_WP_CRON', true);

From your linux terminal, you’ll need to open crontab:

crontab -e

Then you’ll need to add the following to the bottom of the file:

*/10 * * * * curl http://your-domain.com/wp-cron.php > /dev/null 2>&1

Please change the URL to wherever your wp-cron.php file is. The */10 means that it will be run once every 10 minutes.

Thanks @toszcze!