starnet59 I have to add to the No 3., that postprocessing is not just a CPU intensive task. For the fast stacking you need to store your sub images on an SSD instead of a classic HDD. HDDs are way too slow for this task. When you have over 2-3000 sub frames, Siril, Pixinsight and other softwares create over 100 GB of data in seconds what classic HDDs are unable to handle this quick. Stacking 3000 sub frames from a HDD is 2 hours, the same from SSD is 5 minutes.