Our current server debug mode reports 6 to 7 mb memory usage. I threw up an Apache server with Percona 5.6 tried both PHP 5.3 and 5.4. Its reporting 19 to 20mb a page. Is this being caused by the lack of some installed modules using less efficient fallbacks or is the memory used more related to server configuration and not Xenforo? I guess the basic issue is that I don't know what that memory usage measurement is of.