Minecraft FPS display in Optifine behind the slash?

Ch
3

I have a question, namely I don't know what e.g. 100/80 FPS means when you are in the f3 debug screen. What is the number before and what is the number after. Can someone tell me?

sorry that i write so bad. I have time.

an
1

On the left is your current FPS number and on the right is the lowest you had in the second.

Gu
1

cheesnurger

Gu

1.11.1