It seems to make much higher demands on the processor -- on marginal machines, which were fully functional with earlier versions, some people are reporting that it's not workable at all. Others claim the betas were much better in that regard.
Thanks for the feedback John Paines.
As tempting and desirous as it is for me to upgrade to 12, I'm going to stick to 11 for now. The mission of my project is pretty narrow. If I can get it done in 11, all the better since I'm less at risk for potential issues in lacking the processing power to get the job done. That said, in replicating my original edit, I may run into an edit decision that I cannot replicate with the tools in 11, in which case I'll be back asking more questions.
Curious to know how people are experiencing the upside of 12, as I understand it's a whole new ballgame, despite the greater demands on computer and video card memory. And yes, hopefully further debugging will help to alleviate some of the slog. I'll be tracking within the forum.