Character Load distance on MacPro?

Just got a new Mac Pro 2.66, 1g ram, 256meg v-card. I have a good internet connection and my ping is rarely higher than 100. I know thats not the best setup for a game but I was wondering if anyone could help me out. I'm playing world of warcraft with all the settings turned up and am getting a consistent frame rate of about 30. The problem is character load in. It seems fine in cities and such, but when im anywhere in the world I tend to run past players and they load in behind me without me ever seeing them. Is it that my system doesnt have enough RAM to load things in quickly to keep up with the CPUs?