So I updated from 3.8 to 3.9 and started rendering a video. Audio rendering was fine but when video rendering started, the speed was really slow. Hand and note clips both played fine in the preview but rendering speed was about 10 times slower than in 3.8. I posted here before about slow rendering and paused hand clip in 3.7.2 and the issue was fixed in 3.8. Was something changed in 3.9? I also tried to render the same project I sent to your support and it had the issue (tried this and the new project in 3.8 and rendering was fast). So if you want to test it, you can find the files in email "SeeMusic 3.7.3 Rendering problem".