I have a mac book pro late 2011.
It has a very powerful hardware. But it is very slow. For example when I'm making expose geisture, there appears 'loading circle' and mac lags for 4~5 seconds. Same as I'm trying to switch to Safari or other program. I can't even sometimes type text normally while I'm having skype call.
How can I diagnose my computer ? Is there common workarounds to optimize performance?