Why do Azure Functions take an excessive time to "wake up"? : <p>We have a simple Azure Function that makes a DocumentDB query.  It seems like the first time we call it there is a long wait to finish, and then successive calls are very fast.</p>

<p>For example, I just opened our app and the first Function call took 10760ms, definitely noticeable by any end user.  After this, all Function calls take approximately 100ms to process and are nearly imperceptible.</p>

<p>It seems as though there is some "wake up" cycle in Azure Functions.  Is there some way to minimize this, or better yet is this documented somewhere so we can understand what's really going on here?</p>
