title: Slow Time To First Byte (TTFB)
body: <p>My website has a really long TTFB, about 10-20 seconds.
  Here are the results from webpagetest: <a href="https://www.webpagetest.org/result/191231_XT_1c7004d39484c32e8e2493c4b4bb75c4/2/details/" rel="nofollow noreferrer">https://www.webpagetest.org/result/191231_XT_1c7004d39484c32e8e2493c4b4bb75c4/2/details/</a></p>
  
  <p>The web bytecheck says that the very long task is SSL. But the SSL certificate (letsencrypt) seems to be ok (ssllabs.com/ssltest gives an A grade).</p>
  
  <p>Also I think it is not a code issue, because if I create a new html static page that only contains the word "hello", it also takes several seconds to load.
  The server doesn't seem to be overload either, the command htop shows a very low CPU and RAM usage.</p>
  
  <p>So, any idea what can be slowing the website?</p>