Hi Tenei,
You can significantly improve the performance of the control using the following check list:
1. Make sure that you use texture zoning:
surface.FillMode = SurfaceFillMode.ZoneTexture;
2. Turn on hardware acceleration:
nChartControl1.Settings.RenderSurface = RenderSurface.Window;
3. Diminish the number of data points - this can be done automatically by the triangulated surface - check out the All Examples \ Chart Gallery \ Triangulated Surface \ Surface Simplification example.
Hope this helps - let us know if you meet any problems.
Best Regards,
Nevron Support Team