CPU Usage on Imac

Hi, I am very new to unreal engine but I’m using the following when opening unreal engine.

Imac Retina 5K 27", 4GH Intel Core i7, 32GB 1600 MHZ DDR3, AMD Radeon R9 M295X 4096 MB.

I am getting an enormously high CPU usage % for just opening a project and then opening a blueprint or a material. Is this normal? Is there anything I can do reduce this? I always close the Epic Games Launcher as apparently that can help but doesn’t seem to reduce much. I have also turned off realtime under viewport options.

Screenshot attached.