I'm coming up on a year of knowing JS and none of the recommended beginner resources or books ever mention performance or profiling. It seems to just not be taught. On /r/javascript and other forums I do not see it mentioned often as it's assumed the library or framework takes care of it.

I'll take the opportunity now and ask for good resources on JS performance, garbage collection, and profiling. I realize I know the syntax and semantics well (and a framework or two), but not enough about optimization and related stuff (like ServiceWorker).