Desciption:
Only with the Project MMO, OptiFine and OptiForge installed, if the player under the Survival Mode is in a place with many leaves (such as jungle), FPS would be greatly reduced. My computer's fps is 200(not in jungle) -> 40(in jungle).
If the player is under the Creative Mode or Spectator Mode, this problem will no longer exist.
I have reported it to the dev of the Project MMO, he thought that it was caused by the interaction between the two mods.

Project MMO version: 3.64.2 OptiFine version: 1.16.5_HD_U_G8 OptiForge version: 0.5.7