The \org tag has been in ASS since forever, so have \move, \pos, \t and the rotation tags. Rotation and movement shouldn't be any slower (or faster) when origin is specified.
One thing to be careful about is using decimal coordinates for \move and \pos, because was added only later, so there might be a few users that have old VSFilter versions, that don't handle non-whole coordinates for \move and \pos. (Those that don't handle non-whole coordinates will completely ignore the tag, making the text use the default position instead of the specified.)
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