Poor DSP performance with Cubase 11

In Cubase 10.5 with a buffer of 256 I have no problem playing one instance of VPS Avenger playing a full sequence/preset.
In Cubase 11 playing the exact same preset - Cubase just stutters and stops.
As far as I can tell, the settings are the same in both versions.

I also notice that my bounce/render times are greatly increased. It used to be one of my favourite things with Cubase that it was quite fast with rendering/bouncing. Now it’s like Realtime even when I uncheck the Realtime Export. Gotta stay with 10.5 for now it seems.

Could it be a multi core issue? :thinking:

Do cubase 10.5 and cubase 11 have the same permissions in your macOS? Like microphone access, etc?