I recently got a new Macbook, and am new to Mac OS X. Everything seems to be working fine, but sometimes, after a period of use of my Macbook, the system (or maybe only the mouse) becomes laggy, or rather jerky. I can move it freely, but it freezes for a millisecond in between, and then appears a few hundred pixels away from it. These 'jerks' then occur at regular intervals of time, which is generally one second. Sometimes, this is also accompanied by system jerks, but it is not evident until there is something moving fast, so it is visible only while typing (i.e. I am typing but the text appears in jerks) I first thought that this problem was related to overheating, but then ruled that out because it occurs sometimes even immediately when I boot up a cold system. The problem is usually temporarily fixed by a reboot (and not by a log out/log in) but the problem soon returns after 30-40 minutes of usage. Any ideas what the problem maybe? Is it a software related problem or a hardware problem? Anybody faced this problem before?