I have started using Brackets more and more for HTML and CSS editing, however.
"Given enough eyeballs, all bugs are shallow." - Linus Torvalds
At any rate, I downloaded it to try it out for a few days. I didn't notice any initial latency. My current editors are Sublime and Xcode but I still use Emacs and vim on occasion.
Atom, from github has no "we also make" worries the developers might wedge in there.
VS Code was last to the party.
I still use brackets but I installed Atom last week to have a go with. I was pleased with what comes out of the box. (context): I used to use sublime since (roughly) just before 3.0 builds were announced then used brackets from around 1.0.
sublime and brackets used to really crawl until I excluded things like .git and node_modules form their search tools. Perhaps Atom is similar for people?
I'd expect some part of their users are people who have it installed, and check from time to time if it became faster or not, but the main thing making it popular is the promise of being easily extensible.
Are you using the latest version? Performance did increase quite a lot since 1.0.
I suppose it's subjective/a matter of habit. I have a colleague who uses Atom and I tried it on his workstation, because I desperately wanted to like Atom so that I can finally put Emacs away and leave the 1980s behind. He swears it's fine, but the lag is driving me mad.
I'm not a super fast typist (110-120 wpm on a good keyboard, and I certainly don't type that fast when I'm coding because I don't think that fast). But I don't look at the keyboard when I'm typing and the lag is very triggering.