Using Camtasia 9. Every time I make a cut in a video (even if I have only imported 1 video, and made 1 cut in it) the preview screen lags as it plays over it, making it pretty impossible to edit anything effectively using this program. The audio seems to be fine and continue along, but the picture lags. I have already tried everything suggested here - https://support.techsmith.com/hc/en-us/articles/203729208-Camtasia-Windows-Playback-in-timeline-appe... , however nothing has helped.The simple solution to me would be to lower the quality or resolution of the preview screen. Can someone please explain to me how to do this? Getting slightly frustrated that a program I have paid a lot for doesnt do what it says on the tin - allow you to edit videos! Any help hugely appreciated.