After i saw my brother's mac applications start up in split seconds, i thought why can't my ubuntu do that?
That's when i noticed that the compiz animation for opening windows actually increases the time for a program to start.
I tried reducing the duration of that certain animation from 200 to only 50 and now it feels like my system is much faster and responsive just because i saved that half a second here and there.
My point is the default animation durations for compiz should be shorter to give the impression of a more responsive operating system. But that doesn't mean it should be disabled, because compiz animations never fail to impress people.