There is a lot more latency on satellite links. Craig Wiseman suggested these parameters for your TCP/IP adapter that connects to your satellite modem:
TCP RECEIVE WINDOW : 224360 WINDOWS SCALING : YES TIME STAMPING : NO SELECTIVE AKS : YES PATH MTU DISCOVERY : YES BLACK HOLE DETECTION : NO MAX DUPLICATE AKS : 3 TTL : 64 MTU : 900
You can use DrTCP to make these changes.