Material editor has serious redraw issues

Hi,
The material editor tab has serious issues with redraw, it’s constantly redrawing on every texture kind with huge wait times when a change is done, worse it doesn’t even redraw properly even after waiting.

This can’t be video driver issue of the famous update your drivers because all other programs I use don’t have this issue. This is one flawed interface it can’t even redraw properly and let you work in it without major frustrations. Sorry Love your stuff but this is one big show stopper for me to try to use Rhino for rendering.
RM