Upgrade from Mavericks to Yosemite

hi, all! i'm considering direct upgrade mac mavericks yosemite, i'd ask if direct upgrade slows down our mac.

of friends suggest me of doing clean install indeed. what's opinion on issue?

 

experiences seem mixed, updated 4 machines (2x imacs, 1x mbp, 1x mba), , had no performance issues on of them.

 

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