Vertex Buffer Optimization

I looking for option in engine, to turn on Vertex Buffer optimization, or any other optimization.
When i was writing my own engine on SharpDX, I have got 20ms per render on 20,000,000 points and 60,000,000 triangles objects. But with HelixToolkit.SharpDX.WPF I even cant render 2,000,000 points because its laggig to much.