Sublime could possibly choke on these file as well. I've had issues with larger files with it.

Yeah, don't get me wrong, a few times Sublime has crashed, but then it's usually syntax highlighting, I turn it off and it works a treat.

True. You have to agree though that this is unfair to Atom. It's new, yes, it uses WebKit now, but it may have native rendering tomorrow. To shoot it down in the early beginning given it's doing many things right (like native package management) - it's not the right thing to do in this forum!