Update minimum requirements for Rhino 7

[wim (Wim Dekeyser)]

@seltzdesign

@wim Do you know if the Grid is somehow optimised for fast rendering or is it literally just drawing 200.000 lines in the case above?

Why is the grid & dimensions in "large objects - millimeters.3dm" so small?

Rhino still performs quite a few calculations to draw the grid and this does get slower as the number of lines increases. This is something we can improve on in the future; it just hasn’t been as big of a priority for optimization as actual geometry.

-wim