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Originally Posted by CatOne View Post
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.
I was meaning the runtimes loaded into memory to support currently running apps.

If you run a 32bit app in the background whilst running a 64bit in the foreground, you need both sets of libraries active in memory to support both architectures.