I bought the app and there is about a 30 second delay with each tap, it’s incredibly frustrating. I haven’t updated to iOS 9 yet but I’ve read other people having the same problems on that OS so it could be with the app itself. Please do some bug fixes 
It’s getting a bit ridiculous now, it totally ruins the game. I understand that positech isn’t some huge company that can fix problems in an instant but it’s now been ages since the patch. Not only that but I’ve seen no response to all the complaints (someone please link me to one if I’m wrong) and Its so frustrating. All I want is for this problem to be acknowledged and to know that it is on his mind at least.
i’m sorry if i’m wrong, but i beleive turning transitions off in the settings work, i had this problem as well.