title: Firebase functions slow cold start time
body: <p>I read <a href="https://stackoverflow.com/questions/47711909/firebase-google-cloud-function-cold-start-issue">here</a> endpoint spin-up is supposed to be transparent, which I assume means cold start times should not differ from regular execution times. Is this still the case? We are getting extremely slow and unusable cold start times - around 16 seconds - across all endpoints.</p>
  
  <p>Cold start:
  <code>Function execution took 16172 ms, finished with status code: 200</code>
  After:<code>Function execution took 1002 ms, finished with status code: 304</code></p>
  
  <p>Is this expected behaviour and what could be causing it? </p>