For Windows Server 2008 and Windows Server 2008 R2
Navigate to Computer Configuration\Administrative Templates\Windows Components\Terminal Services\Terminal Server\Remote Session Environment and set compression algorithm for RDP data as follows:
Optimized to use less memory (RDP 5.2 or V1):
Bulk compressor from Windows Server 2003
Consumes more bandwidth than other compressors
Has the least memory and CPU overhead
Gives you the best server-side scalability
Balances network bandwidth and memory (RDP 6.0 or V2):
The default setting if the Group Policy setting is not configured
Balances between memory consumption and network bandwidth
Can reduce your bandwidth by 5–30 percent compared to the RDP 5.2 compressor
Optimized to use less network bandwidth (RDP 6.1 or V3):
A new compressor designed for Windows Server 2008
Tuned to give you the best network performance
Can reduce your bandwidth by 10–60 percent compared to the RDP 5.2 compressor
http://download.microsoft.com/download/4/d/9/4d9ae285-3431-4335-a86e-969e7a146d1b/RDP_Performance_WhitePaper.docx
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