What's been the biggest challenge you've faced in the development of OCS?

I think you're going to get a different answer depending on who you ask. I'm extremely tempted to say networking, but I'm not. I'm going to say that it's probably the stuff Gordon was talking about, the conversion of entity spawning over to be thread safe and asynchronous. It's been a massive effort. And also the production side of things, because it's touched so many teams.