Ryzom benefits immensely from running on all processors under Windows. You can right click the process in the Task Manager and set the affinity to all processors or you can use a utility like Task Assign (http://www.mediafire.com/?b3io2coj3h8hc1n) to automatically set the affinity each time you launch the client—this is what I do.
---No guild. No fame.
Gorran is my name.