On OSX, Sublime Text 2 and 3 never felt much faster than VSCode to me. Small and medium sized files were snappy enough for me not to notice, and they both choked hard on larger (multi-GB or many millions/billions/etc. of lines) files.

Could have been a plugin not scaling, but I didn't care to experiment and find out for sure.

Sublime seems clearly faster on Windows 10 for me though.