How old is your computer?
Try cleaning up your computer or even resetting.
I reset my laptop cause my games could hardly run anymore and boom, everything was good.
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my ipod is ipod5. it was the best with ios5 and 6.
my mac is late 2012 model with 8gb of ram, intel i5 with 2.7ghz.
it takes 20 second to open an app, after that it's fine. but on mavericks, it took only 5 second to open an app.
and there's few glitches where my mouth cursor appear really big for 3 second.
another case is i click a reply box and it triggers 'go back' function.