Welcome to the website and the Forums.
I'll start with linking you to an old post where I talk about how to build speed. As you will see in the post below, I firmly believe speed is one of the easiest attributes to obtain on the harmonica if you are willing to put in the time. Here's the link-
One of the techniques I use a lot which sounds fast (and is fast) is "tongue-switching". Here's some posts discussing it-
While we're on the subject of what I do, here's a post discussing my mic and amp setup for live and studio work-
This should get you started. Keep in mind, something as simple as playing higher key harmonicas allows you to play faster than playing the lower ones that require you push more air through them.