Why is my boxing teams laggy some places.

Hi guys.

I've been multiboxing for a while now (lvl 65 on 2nd team), and never really had too many issues, other than macros etc, which I have found everything I need of here..
However, after buying a new computer a few months ago, a lot of things have gotten laggy.
Obvious places are Dala and WG fortress during battle, where framerate can drop down to 1-2fps.

Right now, standing still in WG with no people around, my main is running 23 fps and all my slaves (4) are running on 10 (as locked by Keyclone)

All the graphics settings are on minimum, and I get that I sholdn't expect top performance, especially not in WG and Dala, but I think my computer should be able to perform a little better than that.
Here's the setup:
Dell XPS630i, intel Q9400, 4Gb ram, Vista Ultimate 32bit, 5 x Samsung Spinpoint F1 1Tb (2 of which are connected to a Jmicron PCIe-SATA card), Nvidia Geforce GTX285 with 2 samsung 24" widescreen monitors.
On the main screen I am running 1x WoW at 1900x1200 minimum graphics, and on the other 4x WoW at 720x576, minimum graphics..
I also have a high speed memory stick in one of the USB2.0 ports acting as a 2gb Readyboost, in addition to the 4gb page file on my "D" drive.

Why does this setup still lag so badly, I've tried so many things now, and I'm running out of ideas..

-Gizmo-
Nagrand(EU)
Team Infinite Reality - Lvl 80 Human warlocks
Team Kitty - Lvl 65 Nelf Druids

Take tue usb 2.0 port with readyboost out. I tried using one of them and found that the game would stutter ever couple of seconds.

You only have 3 gigs of RAM... that is not good and is probably a good part of your problem. I am assuming your GTX285 has 1gig of RAM?

With the exception of the RAM your machines blows mine out of the water and I get manageable framerates in WG.