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Originally Posted by fairydreams View Post
From what I understand a universal binary also helps other apps as running 32bit and 64bit requires two sets of libraries so uses more memory.

Sadly I'm not yet at the point where it matters (still 4S).
A universal binary doesn't take much more space. The majority of an application "bundle" is the resources (graphics, images, etc.) rather than the executable code, and the latter is the only thing that has separate versions.