Painter 12 Brush Lag (Airbrush only thus far...)

So I recently purchased Painter 12 and have been enjoying it so far. The only problem I am running into is brush lag when using the airbrushes. It lags enough to make it extremely difficult to paint properly and I'm wondering if there's a fix for it or if my specs are just not good enough.

 

Hardware:

AMD Athlon 64 X2 5600+ @ 2.8Ghz

3GB DDR RAM

EVGA GeForce 8800GT @512Mhz

Wacom Intuos 4 4x6

Software:

Windows 7 Ultimate 32-bit

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