Added 4th account need some optimization advice.

I added a 4th account finally and my main screen FPS was cut in half. From a solid 60 down to 30.

Every feature has been turned to it's lowest setting.

Here are my computers specs:

ASRock Z77 Extreme4 LGA 1155 Intel Z77
Intel Core i7-3770K Ivy Bridge 3.5GHz (3.9GHz Turbo) LGA 1155 77W Quad-Core
G.SKILL Ripjaws X Series 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866
Corsair Force Series GT CSSD-F120GBGT-BK 2.5" 120GB SATA III Internal Solid State Drive (SSD)
Western Digital WD Black WD1002FAEX 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s \
EVGA 01G-P3-1561-AR GeForce GTX 560 Ti FPB (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16

Are there any features I can change in Nividias settings?

[Alge]

You may have a bottleneck, see http://isboxer.com/wiki/HOWTO:Tweak_your_framerate.