I've been on a break for a while from WoW, but decided to get back into boxing the new expansion.
Unfortunately, what used to be sufficient RAM is no longer enough.

Do I just need to buy more RAM, or is there some setting I can change to decrease the amount of RAM each instance uses?
All graphics settings have been lowered the minimum, but each instance is still using about 1.2 GB.
They all crash once the 5th toon enters the world and I get a message about insufficient RAM.