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Bert, something you might not know... on my 4-core machine registax always runs on core 0, I don't know why but something about it means it's never scheduled onto any of the other cores.
So if you run 2 or more copies at the same time then they all fight for time on one core while the other cores sit idle. Not Very Good.
You can override this manually after starting each copy of registax (on winxp use ctrl-alt-del to bring up the processes list, then right-click on registax and set the affinity so each copy runs on a different core).
I've emailed the author (Cor) but he has no idea why this happens...
cheers, Bird
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