Open Windows command prompt

and try write this

tracert ipofserverwithoutport

example

tracert 81.91.242.31

that will check your connection to the server you are planning to visit, if there are some majorbumps in the numbers you will be getting then thats most likely where the problem is, it can be at your end or the server or on the route you are taking to connect to the server.

also try adjusting your netsettings as suggested above, if your net aint the best you could try and use rate 13000 and maxpackets 60