I've been wondering that too. No way it doesn't affect it at all, it's in the background at all times.
My issues with it are this: I think it's too damn slow sometimes (rarely, but it's still annoying), but moreso, these types of apps need more complex gestures to activate. I had set on my bottom edge, but it gets mixed up with my LPP swipe ups sometime, so I moved it to the right edge, and now once in a while if I'm typing the "p" doesn't work because i'm hitting the edge of the phone. Very annoying. I like the app a lot, but it may have to go. At least make it "middle right and left edge" or something like that. What I'd really prefer is having to touch and the drag a circle or something like that,.