Great article. Avid ST3 user here, but glad to hear about the improvements.
For anyone curious, I made a quick gif comparing startup times on my machine for Sublime Text 3 (Build 3129), Atom (1.16.0), Atom Beta (1.17.0-beta2, the one mentioned here), VSCode (1.11.2), and VSCode Insiders (1.12)
https://media.giphy.com/media/3ohzdTHkfj5ISAAPq8/source.gif
I should mention - my ST3 is heavily customized (28 plugins), while Atom and VSCode are absolute stock.