You’re probably using NRD, and 64 samples is an interesting balance between performance and quality. Although we have the option to increase this value up to 1024, we don’t have the option to use a lower value to quickly generate video previews during the approval phase. That would be a nice feature, since using 3/4/8 samples we could generate videos in a fraction of the current time, and once the project is approved, render it in final quality!