On one particular VPS, I had the opportunity to raise the RAM from 1 to 2GB. All that happened is CWP maintained the committed RAM at 2.7GB. Grrr. Nothing else was changed. So called Apps now consume 1.48GB. At least it ain't swapping to disc now, though cache is a crazy 500MB.
Note: this is on a very quiet VPS with only one client website.