I use to make sheet music using Finale on Mac Mini. Holy Schnikes was it slow. You really felt the lack of RAM; it was like trying to tow a trailer with a tricycle. Fortunately for me and my music and my ipad, I now have a proper PC which is big and fast and angry and has windows 7, along with an Ubuntu dual boot to impress hipsters and nerds. :D
Woe betide the man who tries compiling software of any sophistication on it. I know nothing of the programming process for Ipads, but if you want to, say, write code in a text editor, and then compile it on a proper Mac, yeah, I guess that could work. But even an entry level Macbook would probably be a better idea.