Probably not many. They are too busy developing instead of over obsessing over small performance gains
Text input lag is an issue every editor has to deal with, and many go to extreme lengths to optimise it. Electron makes it far more difficult than most editors to fix, and every lag issue opened on VS Code seems to get decent attention, (and patches), and comparisons to Sublime Text.
Seems to be something I'm not alone in caring about.
Shocking, when I look back at it.