Is there a fix yet?
I have this problem on my Windows 10 computer since I have reinstalled Cubase 8.0.40 a few weeks ago I believe. I am running Cubase with a big VE Pro 6 template, but the problem also exist when I just open an empty project, add an audio channel and add a few plugins as insert effects to it.
My template just uses 10-20% CPU (without any insert effects). As soon as I add a few insert effects it sky-rockets. I never had any CPU problems with insert effects before.
Hope you have a fix anytime soon, because right now I have to disable most insert effects on my template to make it playable.