I think it's important to remind everyone of the world we used to live in where apps were native to the platform they ran on and were performant and power efficient. I think that's even more important than ever to remember now.
That said, somehow Microsoft has pulled off a miracle with VS Code as it's reasonably efficient and performant given the tech stack it's implemented on top of. I think a lot of this has to do with Microsoft being a company that established itself in OS and native application development for Windows. They have an ethic of performance whereas GitHub may not have had that at the time that Atom came on the scene.
Am I missing something as to why this was posted?
Start-up time was the number one reason I was not sold on the Luna language editor -- they were building it on top of Atom! (they are rebuilding it though, or maybe that is already done)
For apps like Slack, I’m perfectly content with Electron.
I also find it interesting that Microsoft is looming over both of these projects, I wonder what that will mean for the future.
IME Atom is not nearly as slow as it used to be, unless you're on a remote FS or have many, many files in the project directory - like it scans them all when starting - so I just keep my project directory small.