Check out speedtest.net and pingtest.net. What it does is allow to you test your ping from one location in the world to another. You will find that the ping from NZ to Chicago is probably on the order of a few hundred milliseconds, which should tell you how far behind the market you are going to be just based on lag. I wouldn't try to scalp fast moving markets from the other side of the world, as a half second delay will kill you. For slower trades it's not a problem.
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I think that something in the 50-100 ms range is probably OK, given that NT 7 is going to be limited to a 100 ms refresh rate on your charts anyways. If your lag is something like 300 milliseconds though, consider the fact that information at the exchange first has to travel to you, then you have to react to it, then it has to travel back with whatever your order is. That entire process can take up to a full second, by which point the market could have already moved pretty far, especially in something like CL. This would be bad if you are placing market orders, for example. Mine is around 40-60 ms or so, which works out OK for me.
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My thoughts were in quite the same way.
Right now I have about 120-150 ms, but what to get about 50-80ms.
Everything which is above 300 ms agree, not quite acceptable to trade futures, unless it swing trading.
Do you use any software to keep internet connection additionally stable and ping time reduced ?
I don't use any additional software. Ping time is mostly related to your physical location, there's not much you can do about it I don't think. The closer you are to NY/Chicago, the better your latency is going to be. I don't think it's going to kill you to have 150 ms unless you are trading CL in extremely fast moving times... and even then, it's probably better not to try to scalp 10 tick moves under those conditions. If you are not noticing any particular problems, I wouldn't worry too much about it.