When using the endoflame I get a fps drop of around 20 frames give or take. I realize I don't have a beast pc by any standards but I will usually get 60 and when my endoflames are generating I get around 30 or 40. I didn't start getting this issue until a few versions ago, and there are some you tubers ( with beast pcs like slipgator) that have the same issue.

Using botania 119
Forge 1208

I guess since so many people are getting it it's something to look into. I've never got it though, it might be a mod specific issue.