We are running our playbacks on Windows Server hosts, either 2003R2 or 2008R2. Since SEUM playback uses local users to run IE sessions, should we change the default setting of "Background services" (for Processor scheduling) to "Programs"? Likewise, should we adjust memory allocation to favor Programs over System Cache? I'm not sure how much difference it would make in the execution time of a transaction, but it seems like the Server and Workstation tuning of the OS would play some role.