If you press "F3" normally in Minecraft you can see the current FPS at the top left, for example 85 fps.
But if you do that with Optifine, there are 2 FPS values, what exactly do they mean? Eg 107/65
The current FPS are on the left. On the right are the lowest FPS that occurred during the session.
Ok thanks, I thought something like that, but I wasn't quite sure ^^