I.about [美 əˈbaʊt, 英 əˈbaʊt]副about often appears as the second element of certain verb structures in English (fool about, knock about, move about, etc). For translations, see the relevant verb entry (fool, knock, move, etc)
While it may seem like the developers are making a big fuss about separate threads for user interface and page rendering the fact is all the technical jiggery-pokery is working.