One machine, two EQ2's

[Eloora]

OK so after finally getting my Assassin to 70 and being on the same page for quests and things as my Mystic, I've taken to running both characters (2 accts.) at once on my PC for convenience sake, putting one on follow etc. As most of you probably know, EQ2 doesn't really dig running more than one instance of the game on a PC, and even with my above averate system specs, I run into bothersom lag off and on, freezes when I right-click things, and the like.

So I was wondering if any of you PC gurus might have some advice on how I can make my boxing experience less aggrevating, be it thru changing my PC settings, in game settings or what have you. Here's my system specs:

Intel Core 2 Duo 6700 @ stock speed 2.67 GHz
Asus P5N32 SLI SE Deluxe
Nvidia Geforce 7950 GX2
Dual Raptors Raid 0
Onboard sound for now cuz my X-Fi has IRQ issues with my vid card, or something
Samsung SyncMaster 21" LCD Monitor

What I'd like to avoid is setting both games' performance options to Atari plastic face mode if I can - spent too much time waiting for a decent system to go back to an ugly game now.

And I have one specific question in closing, and it's regarding dual core processors. What I have heard is that a couple game updates ago, players with dual core processors took a hit in performance due to some change they made to the game. This was before I got this rig so I don't know what performance was like before, nor if there's any credence to this claim, or if there is and I'm just not suffering in performance. I mean, it can always be better right?

So my question is, since the game utilizes both CPU's for all processes on my machine, would setting the affinity of each of my instances of EQ2 to a different CPU help performance? Would it hinder it? I don't know exactly what impact affinity settings have. Any knowledge you guys can share would be appreciated.

Thanks!