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http://www.faxiononline.com/content/performance-and-optimization
It's a good read. Also,please keep in mind Faxion will be the 1st Hero Engine game to release. Most of the studios developing against it are learning as they go. Here's a quote from Sean "Ashen Temper" Dahlberg on the issue:
There are no (released) games on the market that use the Hero Engine and we are the only ones in open beta using it. There are a few in development (and closed beta) and having come from one of them, I can tell you that they have had a lot of internal development to adjust them for their products
FYI - the game he came from was TOR, which is being developed by a much bigger company, has many more resources and staff and still had to learn to use the engine.
In the case of Faxion, this is a game that's only been in development for little over a year and with about 20-something staff. It's pretty amazing what they've been able to accomplish, IMO. Even better, while they plan to launch with a basic featureset, they're absolutely commited to interacting with and listening to players, implementing new features and improving the game.
~Ripper