title: Rails dev server takes a long time to reload after codes changes
body: <p>I swear that this was not an issue in the past and I can't pinpoint when I think this changed.  In my local development environment if I make ANY changes to my models / controllers my server takes at least 20-30 seconds to reload and respond to requests.  This is Rails 5.2.3 and Thin 1.7.2.  I don't recall it ever being this slow before.  FYI I have <code>config.cache_classes = false</code> already which is the obvious culprit.</p>
  
  <p>Any ideas here?</p>