It seems the performance in the newest beta is still messed up. See the movie I attached. All I did was create a new document, float the window, then drag t he window size handle around. This doesn't happen in the production version. My computer is a windows 10 machine running an i5 processor and 2 GB NVidia card. Nothing to brag about but totally sufficient for Affinity. Matt 0001-0213.mp4