Unreal Launcher take more resource just being in the Libray tab.
Is less noticeable with new powerful computer, but with my old computer
16 go ram
gtx 1060 6gb
It is annoying, this make my computer slower and the fan are always fast spinning which make a lot noise and so on.
(it is even worst when a project is open and i show the Launcher to browse in my Library for adding asset to my project for example)
Here just the difference with only the Launcher running