I don't know - but I am on the other end of the world and slush's pool is working fine for me...
Switching from eustratum on OzCoin to 'regular' stratum seems to have much better numbers coming out now. Which is odd, because eustratum should definitely be closer.
On Ozcoin, I was getting really bad efficiency ratings until I switched from the default to the US URL. Now I'm getting 99.5% on average. Network latency will kill you at these hash rates.