@Amit Re: Vacuum etc.
Chrome V8 just released this blog post around concurrent marking, which may be of interest considering how cpu limited the browser is. Contains benchmark numbers etc in post as well. https://v8project.blogspot.com/2018/06/concurrent-marking.html "This post describes the garbage collection technique called concurrent marking. The optimization allows a JavaScript application to continue execution while the garbage collector scans the heap to find and mark live objects. Our benchmarks show that concurrent marking reduces the time spent marking on the main thread by 60%–70%" -- Sent from: http://www.postgresql-archive.org/PostgreSQL-hackers-f1928748.html
