I received mail from technical support manager. This is part of mail:
“It looks like development found the issue two days ago. At the moment it’s scheduled for the next maintenance updates for both Cubase 8.0.x and Cubase 8.5.x and should be released within the next two to six weeks.”
So waiting now for the update/fix and hope this issue will be solved once for all, since it was deal breaker for any further updates and working with such stutter was a drag!
Thnx Steinberg for looking to solve this problem, it’s been a long but manager contacted me all the time as they were making progress…