I'm currently a Windows user and I'm researching for buying a Mac (I'm pretty sure I'm going to buy it). My question is how often do you have to do a fresh install, if at all? I do a fresh install every couple of months on my Windows desktop to keep things speedy. i also defrag every 2 weeks. Do you all do this with OS X? My other question is how often do you reboot or shutdown? I reboot my desktop maybe 3 times a week and the rest of the time its in sleep when I'm not using it. Thanks in advance for answering my dumb questions!