Optimize 'Randomness' option on brush

I use this option a lot, but I noticed setting this option to other than 0 makes brush very slow especially on heavy brushes like smudge brushes. I’m not sure that it’s a bug, but hope it gets more faster. :slightly_smiling_face:

Getting a random number, especially if you join a random number into Rotation, is a pretty expensive operation. There are some tricks when actual random numbers are not really needed, and what’s needed is more like a noise, meaning it’s enough if the human thinks it’s somewhat random. So I guess there would be ways to improve the speed on that…