Dear ABraun. After reading posts related to this issue in the forum, I found that low usage of CPU and GPU is a known issue and @marpet mentioned in the post that some improvement would be made in next release. Right now, the workarounds I can image to speed up the processing are moving the files from mechanical hard disk to solid state disk, having better internet speed and configuering SNAP performance settings. I have tried all of these. Do you have any workarounds?