I run it on an iPad Mini. It seems like over the last six months or so it has become extremely laggy. So last week I did a factory reset of my iPad and reinstall the application. And I noticed the same thing. I talked to my dad because he flies with the same setup and he said he has noticed the same thing. If you touch the screen there is literally 2 to 4 seconds before anything pops up, resizing things takes a few seconds scrolling takes 3 or 4 seconds. It's pretty bad. Anybody else noticed this?