ZBrushCentral

Super Laggy and Pen stops working

Hi,
I have 16 gigs of ram on my Surface Book.
In memory i maxed out the slider to 4096 memory.
I think Max Poly Per Mesh is at 76
HD preview at 38.

I actually don’t know what I’m suppose to set Max Poly and HD preview at, so I’m not sure if this is making my zbrush lag or pen stop respnoding.

Is there instructions how to completely optimize zbrush so that everything runs smoothely?
Without having my pen not responding on me? Especially SHIFT, ALT, CTRL