I have a feeling these battlefields are larger than what we're used to in WoW...
Quote:
Large groups of players can only protect so many areas at one time, and since your world’s score is based on how many objectives you hold, running around in one huge group doesn’t help your world nearly as much as it would to break into a couple of smaller groups so you can cover more area.
If you have 1500 players in a single screen then, yes, it would be much hard for any computer to render that much... but if you have groups of 70v70, or more or less, at several points around a large map then I could see how this would be possible. They don't say what 'smaller' is so my numbers are just speculation.
I'd like to know how large these maps are... relative to WoW zones. Do you know Zaryi?