We may go to CU4, but we're still investigating general performance issues on the 2012 RTM instance.

I have a good amount of data that can be repeatably produced by a long running, well defined process. It's going to take a while to come to any conclusions but Microsoft is looking at the data as are a few generous, high profile community members who have taken an interest.

I'll post any useful information in this thread as well as the similar one that I started.