What sound format is the least overhead for OS X?

I use a typing expander and I have some small custom sound bytes that occur after an expansion. Every now and then I'll notice a pause as the OS deals with tacking on the sound after the expansion. I haven't really paid any attention to the format these sounds are - some are aiff, wav, mp3, m4a etc. For the puposes minimum response time and overhead for OS X, which format is the best. I'd assume uncompressed sound formats would be best because the OS doesn't need to deal with decompressing them, but I'm not sure. Note that I also use these sound files on my iPhone and iPad.

googling around seems to indicate that Linux has HFS+ support built in but you might have to disable journaling on the HFS+ drive you want to access from linux. that should not be a problem with a secondary drive. I don't do linux but when I boot from the ubuntu live CD I can read and write to my OS X drives without any extra preparation.
Message was edited by: V.K.

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