When using either of the Software Defined Radio support packages on Windows to stream transmit data, the maximum continuous streaming rate without underflow is only 3MSample/s (12MB/s) (instead of 12MSample/s (48MB/s) as on Linux).
This can be resolved by setting the Windows registry key FastSendDatagramThreshold to 1500.
To change this registry value:
1. Download the attached ZIP file.
2. Unzip the ZIP file and you should see a registry file: fastsenddatagramthreshold_registry_update.reg
2. Right click on the file and select merge (may require administrator privileges)