Another good way to speed up a gaussian blur is to first run a 1xRadius kernel and then a RadiusX1 kernel. This changes it from O(Radius^2) to O(Radius*2) more

Another good way to speed up a gaussian blur is to first run a 1xRadius kernel and then a RadiusX1 kernel. This changes it from O(Radius^2) to O(Radius*2) more or less.