I had to go back to VP14. I wanted to use Colorfast2 in a slide show. Always after a short time, the redraw of the dialogue window became so slow that it was no longer possible to work. I have analyzed this behavior now. It does not matter if I work with GPU support or not. It is also independent of how often I call up a video FX.
However, when I adjust the window sizes, the dialogue surface building becomes noticeably slower each time. Only if I avoid resizing the windows, I can work for a long time without restraint.
I hope for a quick bug fix.