with Cubase 10, the way resources are addressed and used changed in order to overcome the much discussed MMCSS limitation and generally improve performance on high core-count machines.
If you have a CPU with 16 or more logical cores and have already updated, it would be great if you could could give us a short feedback: a post here, a mail to support (with a ‘FW to Fabio’) or a PM to me are all fine. Of course, any changes you applied (audioengine.properties file, disabling HT or registry key) need to be reversed before checking this out - this could affect previous versions of Cubase installed on the same system [edit: more details here https://www.steinberg.net/forums/viewtopic.php?f=283&t=147175&p=791679#p791732]. Please do that only when time allows and NOT if you are on a tight schedule.
To those who were already in contact with me for trouble-shooting, analysis, tweaking, etc.: I’ll soon get back to you, I’m in the process of checking my cases and collect data.