Generally you want a relatively new computer to run Shoe Last Maker smoothly. But to make it run smoothly on an older machine, it helps to run in shaded mode rather than rendered.
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Your relevent FAQ answer.
These would be isocurves. You can turn them off in the display settings of Rhino by setting them to zero width: Tools/Options/View/Display […]
Sometimes this can happen and I’m not sure why. The fix is use the rotateView command (or button) to get it back […]
Not currently, and probably not for quite some time.