Atom itself maybe, but they've recently rewritten the editor component with React.js for performance (that could only have started relatively recently) and it's

Atom itself maybe, but they've recently rewritten the editor component with React.js for performance (that could only have started relatively recently) and it's still slower than CM. Maybe there's a reason for that, but if it's just NIH syndrome that's a real shame. Thanks for the link, btw.