The Best way to check the network Speed on your VPS/Dedicated is Depend on how you are checking. With Browser it will always show very much In-Accurate. Because of Cache and Cookies. Best to download the Speedtest.net Windows Installer and check with that.

Download - http://install.speedtest.net/app/windows/latest/speedtestbyookla_x64.msi


Slect the Destionation Sercer


2. Then press GO

3. You can see the Result




There are also few Reason you may get Less Speed on a VPS than a Dedicated Server. Because VPS use Bridge Network than Direct Network Port, The Host Server Port Shared between other VPS Users and few others.