Bus speeds are close enough, same memory in both machines, roughly the same hard drives. I even defragmented the HD on the dual with no improvement. The only thing I haven't tried is switching the burners. The dual tower is easy enough to access, but the single is an eMac and that is a bugger to tear down. On Dec 20, 2009, at 6:31 PM, Gerhard Kuhn wrote: > Is it possible that the dual processor machine has a slower bus > speed? Does one machine have more memory/faster memory? How fast > are the hard-drives in the computers? How full are the hard-drives? > > Gerhard > gerhardk@xxxxxxx > Wayne Dobson pwdobson@xxxxxxxxxx (519) 474-1253 res. (519) 860-2725 cell --- Manage your account options at //www.freelists.org/list/muglo