Nuendo 8 VST plug-ins osx

I did search first, I have a 20 core cpu on OS X Sierra
I hope that someone will share if the VST performance hit is or how it might be improved now.

OS X Sierra Nuendo 8.1.1

I am hoping that I can get help on the vst performance meter overload issue
The performance meter can get really high but the OS X system meter shows 90% idle

Is nuendo 8 still supported?