Sublime Text and TextMate will both choke big time if you feed them a large enough file without any line breaks. I have some largish machine-generated (5-10 MB) JavaScript data files that will reliably bring either editor to its knees if I accidentally click on one of them. The XCode editor also chokes.

I seem to recall (though haven't tried it for a while) that the Visual Studio Code editor handles them okay.

It's not a big issue -- since these are machine-generated, it's not normally necessary to edit them by hand. Every once in a while, though, I'll accidentally click on one of them in the file tree. Then I'll curse and kill the editor process.