I made an empty project to test out Lumens with, I had 60FPS in the FirstPErsonExample scene.
Than when I tweaked the post processing volume for lumens quality, the FPS dipped to 14 FPS.
Than when I took a screenshot of my scene with Puush, the FPS jumped back up to 52 FPS without having changed anything in the scene.
I think this is just a bug, where some things do not get properly updated in the engine perhaps?
Screenshot I took when the framerate was low
Screenshot after I took the first screenshot, FPS was a lot more stable
