1. Atom is an open-source developer tool. 'Business decisions' (whatever they are) should take a back seat to 'developer decisions'.
2. The technology stack is not a long-term constraint on performance. It's perfectly feasible that performance will increase substantially over time.
3. Sublime text is not '10-100' times faster.
I'm a massive Sublime fan, and won't be using Atom. But you're spreading FUD.