We finally have C3D 2013, though it hasn't been put into production mode yet. I've done some testing, and it appears that the issues I have experciencing have been resolved. No delay after opening and closing drawing setting or CTRL-Tabbing between open drawings, etc. Everything just happens......finally, and this is with Toolspace open!
Some might say this was due to the fresh install, but I had 2012 completly uninstalled/re-installed twice, so it wasn't that. Whatever the problem was, it has been corrected.
Now the question: what do we do with our half-a-dozen Vault licenses that we no longer need?