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Working on the primitives it caught my eye, that spline meshes are not shown during creation whereas primitives are. Assuming, that the reason to that would have been processing power, when the code was written, I'd think those days are ancient history now. So here's what I got:
Changes:
As I tested with u and v values, that I'd believe to be typical (up to 100 or so), I can't say for sure, that I would have seen any more delay, than when drawing primitives.