the ping is mostly influenced by the connection you have to the server.
so you may have a internet-connection of good quality, which maes your ping good. Or you live near to where the server is hosted, which also makes the connection better.
Everything else just helps little. but there are some commands you can use to increase your performance... unfortunately i dont have jk2 on this computer, so i cant tell you which commands with which settings you need to apply...
so if no other answers soon, i will tell you as soon as we meet on the server
(its better to do there, so you can experiment a little