My macpro is getting slower when i open any application
Hi I used to love my mac ... but now a days im getting fed up with this... i used to proudly say to my friends about it. Since few days there is an issue with both of my mac books... i dont know why .. when i operate or open an application or play a movie or do anything on my mac it gets slower. The mouse doesn't move freely. I tried clearing my history, cache and unwanted application and my free memory in my mac s almost around 100gb with 4gb ram. I had quit all unwanted operations through activity moniter but the problem still persists. It is kinda irritating as windows sometimes does. What should I do?
MacBook Pro, Mac OS X (10.6.8)