WordPress hosting is for WordPress websites only. It’s fast because every aspect of WordPress servers has been optimized for setting up WordPress.
Your loading speeds will be much faster on WordPress in comparison to some other shared hosting sites. This is also true for your uptime. WordPress is a bit less customizable than other hosts, though ,if you choose WordPress as your host, then you will also have to use WordPress as your CMS; it won’t allow you to use an outside CMS.