My site gets a moderate amount of traffic, but occasionally there's an event or some news and I get a ton of traffic. I started using cloudflare, and that helps, but how easy is it to split the load on Xenforo among servers, and have an extra server spin up when the load gets heavy? I'm on vB4 now but will be migrating to XF soon. These kind of events are expected to happen again, as well as an expected jump in members and activity in the coming months, as a new product gets rolled out. So I'd like to get the server configuration figured out with scalability in mind before the migration. Thanks!