One work-a-round to this is to save whatever you're working on, close Vue, wait a minute or two and then reopen Vue and reload your scene. As the other posters mentioned, Vue has a problem with memory management (somewhat improved with the latest beta release, but not fixed), even if you do absolutely nothing for several minutes, it will still be using 50-75% of your available RAM. If you open taskmanager/process while running Vue you'll notice that the "peak memory" usage and the current memory usage figures are virtually the same, even when you're not doing a thing in Vue, the memory is not released.