Just a guess, but if you haven't already done so go to "Remote Desktop Connection" via the search box that appears under the Start button (on the netbook). Click the "Options" button, and then the "Experience" tab. If it is not already selected, choose the "Low Speed Broadband" connection speed, or perhaps even the "Modem" connection speed. That will disable a number of the options that may be checked in the boxes appearing just below, some of which can adversely affect performance while using Remote Desktop.
Also, take a look at the "Remote Audio" settings under the "Local Resources" tab.
Almarg (System | Threads | Answers | This Thread)