I use an ASI6200MM with a Raspberry Pi 4 with 4 Gb and if I switch off the FITS viewer, KStars runs all night without crashing. If KStars doesn't run on an RPi then why would it run on a mini PC? Also, why isn't KStars able to use more than 2 Gb of memory? Are you running a 64 bit Ubuntu on the RPi? Finally, yes the Pi is laggy for me to but not nearly as much as on the mini PC.
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