Average audio processing goes red, system freezes

Hello everyone,

I know there’s a post about it on the forum but with no answers given…

I have Cubase pro 11 and whenever I want to add a plugin (during the mix session) like Ozone, Waves C6 Comp or whatever it is, the Average Audio Processing goes red and I need to wait like 1 or 2 minutes to be able to playback as the system freezes (video AND playback). The cursor doesn’t even move…

Is this due to my processor or something ? I tried to increase and decrease my buffer size and all but nothing’s worked so far/

Can someone know this issue and how to resolve it ?

Have a nice day people,