For Internet Explorer :
Start > Run and type "regedit"
Select HKEY_CURRENT_USER > Software > Microsoft > Windows > Current Version > Internet Settings >
Open "MaxConnectionsPer1_0Server" click on DECIMAL and set value "10". Do the same thing for "MaxConnectionsPerServer" .
Close regedit..
For Mozzila Firefox :
Type "about:config" in adress bar > into filter bar type "http" > double click on "network.http.pipelining" set it TRUE > double click on "network.http.pipelining.maxrequests" and set value "10". (If you have mistakes you can reset the value with right click > to reset)
Close Mozzila Firefox.
And voila !