On the SONAR Users Forum, there have been many recent posts that praise Vista SP2 and mention faster bootup, throughput and shutdown times, as well as lower latency measured by the DPC Latency Checker utility. Some have said that, while WIN 7 RC is better, SP2 is close and more like the performance of XP. One poster said his system was responding much worse since his upgrade, but he gave no evidence and did not seem to be a power user who could deal with system problems.
BIAB 2015 Windows Audiophile, SONAR Platinum, Adobe Audition, Ozone, Windows 10 64-bit. Focusrite 18i20, Roland Integra-7, TCE Finalizer. V-Control Pro with iPad for remote triggering.