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zbrush 4r8 viewport lags

Hello guys
when zbrush 4r7p3 working perfectly and smoot at all time zbrush4r8p2 lagging as hell, move brush and transpose and some other brushes lagging
i have clean install w/o nothing only win10 and zbrush r7 and r8 which last is lagging when prev version working like a charm -)
I trying set more mem but still cant fix this problem

can anyone help?

Make sure “Tool > Geometry > Dynamic Subdiv > Dynamic” is off.

thanks for reply but its not dynamic subdiv
and as I say most trouble its when I use transpose tool and move brush
really weird situation but when transpose is lagging new Gizmo work just fine smoot and clean