Maybe because it's a considerable part of the code that CPU's are executing these days? Certainly UI stuff that should be responsive and fast. Even many 'nativ

Maybe because it's a considerable part of the code that CPU's are executing these days? Certainly UI stuff that should be responsive and fast. Even many 'native' apps, mobile or desktop (electron) are written in javascript, and how much of your time do you spend in your browser or electron apps every day? Think vscode, atom, Spotify, Slack, facebook, reddit, twitter, ...