I'm having both intense lag with BoP generated worlds, and have had this crash twice. VanillaFix says it's a FoamFix issue.

https://paste.dimdev.org/jepuzoqana.mccrash

Got another one for ya. https://paste.dimdev.org/pacaxomufa.mccrash

My gut feeling says it's more likely to be JEIDs' fault than mine.