For Haskell, Atom is near unusable. Input lag reaches double digit seconds, and crashes are frequent. Sublime is a tad better, but background processes for both are not managed well. Base editor vs editor, Sublime is the clear winner for general editing (not dependent on background processes/hooks) in terms of performance mainly due to io cycle time - mostly electrons' fault.

Vim and emacs are the solution most of my colleagues use, my experience with bindings in those editors is poor, but I'm switching slowly.