Hiya,
Thought I 'd pitch in on this as well.
I am also seeing this issue, it is mainly noticeable for me when destroying trees with weapons, for example having the FPS/UPS counter enabled and force firing on a tree with a gun would make the rate drop from a solid 60 to 55-58 (ish).
Throwing a grenade at a group of trees was the real nightmare though, depending on how densely packed they were it would either drop UPS to 20-30 or even lock up the game from a few seconds.
Unloading just this mod fixed the issue immediately, however, I did try to reload it before posting this to test destroying over objects as well, but the issue no longer seems present, unfortunately, I did save in between though so the mod is having to reload the lights back in.
I'll leave it enabled for now and post again if it reoccurs.