BTW, the long term plan to remedy the Atom performance seems to be this:
https://github.com/atom/xrayJust in case people skimming Atom news don't think they are acknowledging the problem.
Still Electron though, but onlt for the view. Much of the "controller" moved to Rust, including writing it from the ground up to take advantage of safe, easier parallelism from Rust. Text will also be rendered with WebGL, so hardware accelerated. All in all, looks pretty ambitious! It seems like it will take until 2019 for even a tech preview though.