I'm trying to use KER (v. 1.1.83) and it drops my FPS below 20-30, making the game very-very sluggish. It happens when I launch a rocket with a Kerbal Engineering System or when I start a mission where KER is already enabled. It's the only mod I installed, also when I remove it FPS is always 60 (I suppose it can be much higher, but I locked it to 60). My PC specs are i9 9900KF, RTX 2080Ti and 16 Gb RAM.
Has anyone experienced such problems? Any solutions? I understand that I can play without KER, but it would be nice to have it installed.