On May 2, 2006, at 8:11 AM, tomdcarden wrote: > When having performance problems, how do you determine if it's > because there is not enough RAM or the CPU cannot keep up? > > In the System Performance meter window, why are there 2 columns for > audio? and exactly what is it measuring. > > Exactly what is the Disk I/0 meter measuring. > > Anyone know where, in the main Reference manual the System > Performance window is explained? I found by accident using the key command Option-X. A much more reliable measure of activity can be seen by running "Activity Monitor," included with OSX. It should be in the utilities folder in the applications folder. I've moved mine to the finder window's side bar for quick access. Activity Monitor shows activity by CPU usage, RAM usage, Virtual Memory Usage, and Disk Access. Be careful though as Activity Monitor also allows you to kill processes. Tempting, but without expert knowledge of what all the running processes do you could foul things up pretty well! Stuart Holmes Holmestudio Music