Well, fresh from the funky night club, I'm ready to share.
Found the smooth RT slo-mo in Vegas tonight.
And Rob W., I've also found your fix for the rendering blues. Hope you do the test yourself this time.............
Surf the preview renders, and you'll find the sweet spot of Vegas.
More later, cheers.

Craig H.

PS, if your still reading.
Then, you want to know all about the big speed gain in Vegas. OHCI preview output, switch between good and preview. It takes the alot to see a difference, try the deform filter. If you find it, know that you can now render needed regions in good and pump the rest out at preveiw.
SF, you need to rename your render settings.
Yes, realtime slo-mo that looks better than good render setting WITH recompress.
BINGO

Craig H.