Question: How long does it take to kick?
Answer: Usually 0.8 seconds, it can take longer if the player toggles FastMath on while joining without FastMath. It can also take longer if by chance, FastMath has the same result as the regular trig table.


Question: Why?
Answer: I made this plugin for parkour servers, as optifine fast math allows movements that are not possible in vanilla. It could also be useful in PvP servers, where fastmath gives 3.00025 blocks of reach in some cases.


Question: No, but really, why?
I needed this function for a future anticheat and I'm open sourcing this detecting to help other devs