Can anyone tell me why Logic runs faster on an iMac G5 than my G5 2.7 PPC?

Question

I am missing something. On my desktop tower Dual 2.7 PPC on which I run Logic Pro 7 and other programs like Protools 7.1, I noticed that Logic 8 runs slower than Logic 7 - graphic redraws are sluggish.
However, I just came back from a friend's and saw Logic 8 running on an iMac G5 - with a single processor to boot (can't remember exact clock speed but under 2G) and redraws are quicker and I didn't get the "Disk Too Slow" message when playing the demo content.
How can this imac run Logic better than the better spec'd machined?
Has anyone else seen this?
Some installation must be hampering Logic 8 performance on my 2.7G mac but I can't think of what. Maybe one of the Pro Application updates? Or maybe I need to install the Pro Application updates?
Any help is appreciated.

Answer 1

it is not a 'port' steve, it is as native on ppc as it is intel...and i think the OT was talking about an older imac that was still ppc.
ken, i would say that the problems you are encountering may very well be a pro app update. but it also depends on the project as well. i have been finding some projects behave very sluggishly and others, even more densely programmed ones are quite smooth. also i find the 'sticky' slower projects to be a bit crashier. but the thing is, i don't think it makes any difference between songs made in 8 or made in 7. i would have thought that the 7 songs might cause problems but there doesn't seem to be much rhyme or reason between what songs are going to behave oddly and those that don't.
also there are many factors that can affect GUI speed. someone was saying that if you have lots of icons and folders open on your desktop it can have an affect on your GUI.
but for what it's worth ken, i have 2.7 ppc as well and for the most part the GUI speed is ok (if not actually electrifying).