my macbook air responds late
while i am trying open a window (a file or starting the finder, the launchpad ) or while surfing in the web , my macbook air usally responds late. for exemple on a page already loaded when i am trying to scroll down or up it just stays frezeed for a second than makes the move. can anyone tell me why it happens and how can i fixed.
MacBook Air, Mac OS X (10.7.5)