OpenGL will not run smooth even at 100% speed

[drhycodan]

If I have vsync enabled, the actual fps will drop to 30fps half the time, but the emulator still reports I'm running at 100% speed and 60fps.  This is only with OpenGL, D3D12 does not have this issue.  With D3D12, it is always smooth with vsync on.

[JMC47]

What game are you playing?

[drhycodan]

Metroid Prime from the trilogy disc

[drhycodan]

And the fps has nothing to do with the action on screen or how detailed the background is, I would get 60fps in one location, and return later with only 30fps. The frame drop seems to be time dependent rather than how demanding a section of a game is.