Strange speed on old GeForce

I am playing with a custom display mode on my laptop, it has a custom material. The strange ting is that the SubD object is handeled fast, but once I extract the rendermesh and hides the SubD it becomes very slow. Any idea what’s causing that? (The SubD and it’s rendermesh looks identical, so no sudden increase in mesh density)

The techniques for drawing the SubD use an older version of OpenGL drawing than the mesh drawing code. I wouldn’t be surprised if you got exactly the opposite speed comparisons on a different rig.

Ok, we are talking 60 fs vs 5 fps, just so you know.
(On the 330m)
I’ll compare it on the 970 ad 1070 later.

I also believe that SubD objects may use level of detail meshes based on their size on the screen