whoa you weren't joking, what the hell:
https://gitlab.com/cznic/tcl/-/blob/master/lib/tcl_windows_a...
https://gitlab.com/cznic/tcl/-/blob/master/lib/tcl_windows_a...
But seriously, I would expect most editors to handle large files relatively gracefully, even if they aren’t as fast as vim for example. Browser based code viewers on the other hand, I grant you, aren’t generally up to the task.