Earlier quoted context omitted.
Same for me at the moment. I've heard a lot of complaints that it cannot open large files and it can be sluggish; I don't regularly need to open large files (I'd rather process large log files from a terminal for instance) and the performance is fine for me. I like that Atom is open source, plugins are written in JavaScript and the rate at which new plugins are coming out is impressive.
I tried Atom for a week. The little half-second delays start to bite after a few days, and after a week you want to throw your computer out the window. Think about it. It's 2015. My PC has 8 cores running at unimaginable speeds. It has 16 GB of memory. And my text editor couldn't open files over 2097152 bytes. Am I living on a different planet from everyone else? How can people accept this as a normal situation?
More and more I tend to use software that is either minimalistic or started in another era (Emacs + command line tools). The one exception is the web browser which has to be modern or a bunch of websites won't work.