I like Atom, but man the start-up time is rough when there are several plugins installed.
I remember some time ago there was an uber issue on Github for this, but I think I remember seeing it marked as resolved when I can absolutely tell not much has changed (and I have installed barely any plugins). :(
EDIT: I guess I was wrong[0,1]
[0] https://github.com/atom/atom/issues/2654 [1] https://github.com/atom/atom/issues/9572