In practice it seems to be hovering at around 1-2 anyways. On a side note, I really hate that the JVM requires users to be aware of its heap tuning parameters :/
One of the reasons why Java is largely relegated as a server-side language, I feel. I write WPF apps on .Net and I never have to worry about what I need to set for my heap size because the frameworks garbage collector just works as I'd expect it to - do the same thing with JavaFX and I feel like tearing my hair out.