Since Krita version 3.1 the stabilizer slows down the FPS while drawing. It feels like the FPS drops to 20FPS. CPU-Usage is normale while drawing with enabled stabilizer. FPS is normal if the stabilizer is disabled or set to basic smoothing or weightened smoothing. So I think the problem is the stabilizer. This is not a bad bug but for me quiete annoying because I work a lot with the stabilizers. Disabling OpenGL or enable "Instant Preview Mode" does not fix the problem. This problem exists since Version 3.1. I'm also using Krita Gemini 3.0 (Steam) which dosn't have this problem. I would be very happy if someone could look at this and maybe even fix it soon. Please contact me if more informations are required. Thanks!
*** This bug has been marked as a duplicate of bug 369349 ***