Do you mean from your platform/vps) to their server(mt4 server location)? If so, CNS VPS includes a latency chart to all their OnNet broker connections. I believe Beeks also advertises the same.
From Beeks website
'Latency is the measure in time that it takes a message to go from a VPS to a broker/liquidity provider, this is usually measured in milliseconds. If you are using a popular expert advisor ie Million Dollar Pips, Megadroid etc. There are literally tens of thousands of people trying to place the same trade at the same time. There is a finite amount of liquidity up for grabs to these traders before slippage occurs. The lower your latency is the more chance you have of getting filled at the best price and more chance of making money on the specific trade. It can make the difference between making a profit on a trade and losing. Our data centres are located centrally in London and New York'