this is a vague question.. faster upload speed to where, the internet or your file server... upload and download speed have alot to do with bandwidth used and bandwidth in capacity...
on a LAN, u have between 10Mbps and 100Mbps, standard... here, your upload and download speed is limited by network card quality, server application load, and how busy your machine is...
on a WAN, which is mostly thru an ISP, u will need to purhcase more uplink bandwidth for increased upload speed....
good luck..