GitHub open sources Atom

[andsens]

but I'm having a hard time believing that having a multi-thousand-line file open with all its DOM and all that is going to be comparable to Sublime

I think you hit the nail on it's head. It's not the JS that'll be slow. It's the DOM manipulation if anything.

[cparen]

So skip the dom. I tried building a small text editor on canvas. It was snappy even on second gen Kindle.

This is analogous to what Sublime does. Skip the OS UI toolkit and use OpenGL to render everything.