Tessellation Speed in terms of interpolated points per second
If you’re only tessellating the model once and never changing the density of the mesh then tessellation is probably a waste of time here—any measurements you make would include all the extra work the GPU has to do to generate new points / triangles, which is orthogonal to what it sounds like you’re trying to measure. Tessellating the mesh ahead of time (in your tool of choice) and doing the interpolation / evaluation in a vertex shader would probably give you a better benchmark against a CPU implementation working on the same mesh.