I had an iPad mini 2 and didn't find it slow at all with iOS 8. I only used it for browsing, checking twitter, drawing things in Paper and playing the odd game.
I recently got an iPad Air 2 due to the screen size and while it's a smoother experience, the mini 2 is still a good usable device for most tasks.
I recently got an iPad Air 2 due to the screen size and while it's a smoother experience, the mini 2 is still a good usable device for most tasks.