Control Room mono switch

Switching from Stereo to Mono in Control Room takes a few seconds … in 9.5 much faster…
Or do only I have the Problem ?

It’s diving me crazy. Control Room has like a 2 SECOND lawn switching between mono. Also 2 second lag when switching to or from “speakers C”.
Switching between A+B speakers is fine. Such a big problem for me I’m going to have to stop using Cubase 10 for now. Come on Steinberg… monitoring is hundreds of times a day for us. !!