From 3 to 4 boxing worth it?

[Enoah35]

Hello again,

Going to use this thread instead of making a new one. However this time is more of in need of advice in a more technical way. Since I have moved from 3 to 4 boxing, i noticed more graphical lag and performance issues. I have read the FAQ and did monitor what was causing this and apparently its the CPU that reaches 100% on heavy fights, especially on RoS specific areas and some Rifts. Hardware spec is like this:

CPU : Intel Core I5-3570K 3.4Ghz
MEMORY: Corsair Vengeance PC3-12800 DDR3 1600 16GB 2x8GB
HDD : OCZ Vector SATA3 2.5 SSD 256GB + WD Caviar Green 2TB SATA3 64MB
GFX CARD : Radeon HD 7970 Ghz Version. (Catalyst 14.4)
OS : Windows 7 64bit

I am using 2 monitors. Configured as multimonitor swapping method, main window on the main screen, the other 3 + another Dxnothing window on the 2nd monitor. I configured the cores like this.

Main window : Core 1&2
2nd account: Core 2&3
3rd account: Core 3&4
4th account: Core 4
DxNothing: Core 1

Ingame configuration its set on lowest setting on all games. Usually with this configuration the CPU usage goes from 50%-80% on normal areas. But on heavy mob density it shoots up till 95-98%. Worst areas are pandemonium fortress that goes to 100%. The only thing I can probably improve is to get rid of the DxNothing window that has 3 VideoFX (the minimap of other accounts) and rely on checking the map after clearing one area, or disable sound on other accounts.

Any other tips you can give me I appretiate it.