4.11 poor performance

Is anyone else having serious performance issues? For example I import 1 fbx file which goes insane before I can actually get to the settings it starts compiling shaders which pretty much makes the toolset stutter until it is done. I then try to import an animation and it either begins the shader compiling or autosaves old whatever which freezes the tools all together until it is done. I have a similar problem with 4.10 but not as drastic and no issues in 4.9 like this…