> t was the first editor I’ve seen to choke when opening 1M file

I recall trying Atom before VSCode had been released. I loaded up a 1MB XML file and it ground to a halt.

After some searching I found a bug tracker issue reflecting this, where one of the devs said something to the effect of "a 1MB XML file is extremely large, I don't think we'll support that".

At that point I uninstalled Atom.

On a related note, not long ago I accidentally dragged a 450MB SQL script into VSCode. I fully expected it to cave like Atom had on the 1MB XML. However to my pleasant surprise it worked just fine. Editing it was as quick as a regular file, and the memory usage was not excessive (around 2.5G total). I admit I was a bit impressed by that.