[Synthx]

Sublime 2 is bulky, slow, and not very feature-rich. If you're going to use Sublime, use 3 for the extra speed and space increase. Also the API for 3 doesn't suck.

Though if you're going to use anything GUI-based it should be Atom. It's not super memory-efficient because it uses Electron, but it's super customizable right out of the box; has a great, rich, easy-to-use, and well-documented API; and has direct integration with NPM and Git.

I hate to say this, but I HATE Atom. I love sublime.