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Kate is fine for the first dozen or so keypresses on a 3600-line file (doing the grid cursor thing on the whole file), then slows down. I suspect there's some linear or quadratic dependency on the amount of text inserted (related to undo, highlighting, or autocomplete perhaps?)
Yours is impressive for something running in a web browser; I'm just glad my editor of choice doesn't *completely* suck at this (realistically I'll never need a 3000-line grid cursor :-))
