I've tried running atom several times over its history - first for go and again for elixir. Both times I've had the base version of atom with one or two plugins (go-plus / language-elixir & autocomplete-elixir). I found that, even with that setup, Atom was noticeably slower for all aspects of text editing (opening, navigating, typing, selecting, etc). I also found that the plugins did not work as well as the sublime text equivalents I'd been using (though that's not really Atom's fault).

I really like the idea of atom, but I've found the practical product less than compelling.