Aside the instant3d and tools>options "display shaded preview", how does solidworks control display of feature preview? wireframe preview is still really slow for cuts made from 3D sketches with more than 6 sketch contours. The last resort is breaking one cut feature into a dozen cut features with a few contours. But that is me working around solidworks slow performance and not me doing design.  I found how to turn off display of shaded preview in the options but how can one turn it off altogether? Is it a reg hack? I have no add-ins loaded, its in 2010 sp5 on windows 7, nvidia quadro fx 4000, recommended driver.

Its just really slow to display preview so off it goes, but where?   So, how do I turn off preview altogether?