You probably have the old installers in your Launchbox/Updates folder, just run one over the top of your current install. You will of course lose all the excellent new features added. This issue seems to be strictly tied to you though. As @Lordmonkus said above the new interface has been in beta for months at this point and know-one ever came forward in the beta phase with issues you are describing, in fact you are the only person to mention these issues since the official release was launched also. The new interface is a lot faster than the old one, so the fact that you are saying it is much slower just makes no sense to me at all, all the feedback we have had during the beta period was positive, of course there were issues here and there with bugs and crashes and such, but of course that is why we beta test, i don't recall anyone ever say it was slower than the old interface. For me though personalty i have been using the new interface as my primary driver for months now as it is just a quicker more attractive interface in my opinion.