DailyTech reports Windows 7 RTM benchmark results are mixed, the operating system feels quite snappier but in most of the application performance benchmarks the new OS gets beaten by the old Windows XP. Unfortunately, gaming performance hasn't been tested yet.
Interestingly, the results were mixed. Boot times, despite dedicated tweaking from Microsoft were slightly worse than in Vista SP2 or XP SP3 (by over a second). Shutdown times, though, showed much improvement over the slow XP, and even some improvement over Vista.
Since the 7100 build, Windows 7's performance in Microsoft Office and iTunes has improved significantly. In the Office benchmark, though it still gets beat by both Vista and XP (the overall leader) and it manages to now tie with XP in iTunes (ahead of Vista). In a final Cinebench benchmark, Windows 7 performance improved between the 7100 and 7600 builds, moving it ahead of Vista and just behind XP.