IDEA 8.1.3 Mac performance / startup options

I wonder if anyone could help me with IDEA 8.1.3 on Mac OS X.  I was lucky enough to get an 8-core Mac Pro with 4GB of RAM at my new workplace, but I was dismayed to discover that IDEA's performance is incredibly sluggish, particularly in scrolling editor windows.  As I scroll my mouse wheel, the editor barely keeps up in fits and starts.  Often when typing the characters only appear after a delay.  Given the spec of this computer, it is really surprising.

My next action was to add the server VM, concurrent garbage collector and max memory params to the startup options.  The situation is little improved.

I would be very pleased if someone could share a VM parameters list for these settings, and any other things I could do to improve editor performance.

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