Need Help VST Performance problems

Okey but look at this. Now when I started Cubase 7 and load a lot of vst plugins and layering them I didn’t get the problem with vst performance real-time peak level. This seems to be a random issues/problem/bug. I think I can not do anything about it. Cubase seems to works when it wants.

I took a print screen http://i.imgur.com/O0jfZmv.jpg?1