Open up Windows Registry + r
regedit
Add following keys to the registry
HKEY_CURRENT_USER -> Software -> Microsoft -> Windows -> CurrentVersion -> Internet Settings
right-click add new DWORD (32-bit) Value and name it
MaxConnectionsPerServer
change it to Decimal and edit the value to the max number you want. e.g. 10
and add another DWORD (32-bit) Value and change it same as MaxConnectionsPerServer
MaxConnectionsPer1_0Server