I've never had this issue before Minecraft 1.6 released. I don't have any texture packs or any mods, no matter what view distance I play with, this still happens.
The chunks load very slowly, and they never load to the max. I'm not sure if the same thing happens on single player because I never play single player. But it happened on this server. If anyone knows what's causing this issue, help would be greatly appreciated.
Note: Before 1.6 I was always able to play Minecraft on the highest graphic settings without ever having a problem.