http://blogs.technet.com/b/puneetvig/archive/2011/04/21/remotefx_2D00_windows_2D00_server_2D00_amp_2D00_hyper_2D00_v_2D00_server.aspx  This whitepaper details the performance improvements in Hyper-V R2 on Fixed VHD creation, Difference Disk performance and chain length, plus many other interesting tidbits Download White Paper Here: (Updated and published on March 2010)en-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)