Check this out: https://spark.lucko.me/x3kOqIpW4P

Have a simple mob farm, add EvilCraft spikes and pedestals to drain blood. With 8-10 mobs near these spike, the game grinds almost to a halt.

You can try disabling the Parkour ai in the config for now until I find a way to optimize it further

Which option is that?

I'm guessing: "Enable jumping ai" = true ?

Yeah

As an update on this I switched the algorithm for deciding the angle mobs jump at to what vanilla uses for breezes and goats rather than the copy and paste version I did years ago. I will keep this thread open but if there aren't any further reports in at most a year from now I'll probably consider this closed.