Please do not misunderstand me. Perf work went along with the change to the threading, as our goal was a fairly invisible swap. The threading work opened doors for multiple improvements, including the DLL swapping that comes with the expansion, and the source code that will arrive shortly. We did not see the performance issues as we approached launch. Right now our engineering team is working on tracking down why some people are seeing the slow-down, and some are not. Hopefully we'll have an answer shortly.