http://www.mikeash.com/pyblog/friday-qa-2013-09-27-arm64-and-you.html http://www.mikeash.com/pyblog/friday-qa-2013-09-27-arm64-and... In short, changing archit

http://www.mikeash.com/pyblog/friday-qa-2013-09-27-arm64-and-you.html http://www.mikeash.com/pyblog/friday-qa-2013-09-27-arm64-and... In short, changing architecture is big and they changed multiple things. The new architecture is 64 bit but it's actually some of the other changes that will help the most. So what Apple changed will make a substantial difference, but most of the improvement isn't well explained by saying "now we have 64 bits".