I experience that freeze too since a few weeks now.
It seems really random in location. Number of around bosses and players seems irrelevant. It can happen any time, running or fighting (or even staying still).
swap is not an issue in my case (far enough memory, really, 24G, if the system need swap, there is a leak! (which is not reported, so no, not a swap issue))
number of cores neither (I even wonder if more than one or two is actually used by RO), nor speed (i7 @ 3.33GHz nominal, slow down at 1.6GHz with usual governor)
The frame rate is fine at 60 fps on the GTX470 most of the time (some area get a little temporary slowdown, but not enough for accumulated huge number of late frames). (and CPU usage is barely at 80-90% as reported in RO)
Cooling is really not an issue (disks are below 30°C, even the 470 is not pushed in its hot zone).
Remaining details: Ubuntu 10.10 (maverick), kernel 2.6.35-26, nvidia driver 270.18, x86_64
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