For all steam related speed issues, please use the trick below to get max speed at just one click without restarting downloads:
*technet.microsoft.com/en-us/sysinternals/bb897437.aspx
Detailed Instructions:
1.Download the TCPViewer by clicking the link above.
2.Extract and use the TCPView.exe only
3.Open the Steam, when it shows updating, open the TCPView.exe and find steam.exe inside the TCPView.exe Programme.
4.Right click Steam.exe inside the TCPView programme and click close connection.
Speed should increase now as Steam searches for new servers to download. If the speed doesn't increase repeat step 4. Say thanks if it helped
URL:
*technet.microsoft.com/en-us/sysinternals/bb897437.aspx