This is the app that I use ever day at the end of the day after I turn off all my other applications. It usually takes less that a minute, but it gets rid of all the temp file accumulation of the day. Along with other things, it makes my 2 1/2 year old Lenovo as fast as the day I got it. Everyone with a Window computer should use this at the end of each day before they turn their computer off for the evening.