The best information I've seen indicates that for general- purpose number-crunching, the G5 will be able to give an AthlonXP a run for its money. The next OSX iteration also won't really support 64-bit software, as the API's are going to be 32-bit, initially... though the performance difference between 32-bit and 64-bit software on a G5 will be at best minimal, and at worst negative (64-bit will most likely be slightly slower than 32-bit -- assuming both are optimized for the G5). As to whether or not VuePro is G5 optimized, it depends on whether or not E-on got access to a G5 early enough, nothing more.