I frequently toggle between stereo and mono in the control room view of the right panel. In 9.0, the change was instantaneous. In 10, the song locks up for between one and two seconds, then resumes in the new mode. I didn’t have 9.5 so don’t know what the behavior was in that version. I wanted to rule out any environmental issues, so I just brought up a 9.0 version of the same project and it still switches immediately.
This is an extremely light project with some one recorded guitar and bass part, and Superior Drummer. I’m only using one reverb and two bus plugins, all Waves. I’ve turned SD and all plugins off and get the same behavior.
Is there something new I need to tweak in 10 to avoid this delay, or is this a bug that needs to be fixed?