That's actually faster than pointresize? o.O?
Fastest of all would seem to be the way eedi2 does it internally, which is just copying every line of source into every other line of output. (With suitable simd, which eedi2 doesn't have.) I'm not actually much concerned about speed, as the overhead of making and keeping a copy of something in cache that's just going to be thrown right away. (I use it for biiiiiiiiig stuff.) I guess MakeWriteable would prevent that.
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