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Depends on whether you're a greenie or if you want to decrease your computer's life time (by about a month of so). Powering up your computer decreases your hardware lifetime, due to the amount of energy that is required to power up a computer (it works harder at powering up than it is to operate normally), so this is an argument for keeping your comp on. However, leaving your computer on without it on hibernate (standby merely reduces the computer to minimal energy use) releases up to 20 lbs of carbon dioxide to the atmosphere per month, or something like that. Thus, that's a reason to turn off your comp. It's really just a matter of opinion and how much time you want to wait (immediate start up or a few minutes for the comp to start up). Performance isn't affected by turning on/off your computer.