title: Angular SSR issue with high TTFB
body: <p>I have problem with Angular 9 SSR server. My server has all time 10 sec to TTFB. This issue only occurs only on production server.</p>
  
  <p>I followed with official Angular Universal Guide. I was looking for big time of API response or unnecessary timeout event eg. timer. The next thing I did was change lazy loading to preload modules which entry module need. I tryed also change ChangeDetection on Push.</p>
  
  <p>This all point not improve my TTFB.</p>
  
  <p>Have you any other ideas what can I do more or what should i change to improve it?</p>