EvNet takes a long time to start up. A really long time. It does a lot of DB Queries that can overload the server which times out DB queries which causes the site to error which cause the app to restart...
Once we get going, we're fine but if we make an update or hit a snag that causes a restart, things get ugly for a few minutes.
We're working on fixing this though. Velocity will help a lot since it will make all starts "warm" as far as cache is concerned. I'm also doing some DB work to make our schema simplier and easier to query. We're also bringing a bigger SQL box online to handle the load better. I have no ETA on these changes but know that we're working on them.
We have a few more visible tweaks that are coming soon that I think you guys will enjoy.