Quote - Just out of interest, I did some quick tests using Windows 7's resource monitor. This is on a 64-bit system with 8Gb. The results were:

Of course I can't know Vue's internals, but it's quite possible that some internal memory structures get only initialized/allocated on demand when needed, and freed when Vue is closed.
Downside is that no one else can use this memory until Vue is closed, advantage is that memory becomes less fragmented and things are slightly faster.