title: Cloud Run: real world experience with custom domains and issue with latency
body: <p>In researching Google's Cloud Run, one issue listed is:</p>
  <blockquote>
  <p>High request latency with custom domains when invoking from some
  regions</p>
  </blockquote>
  <p><a href="https://cloud.google.com/run/docs/issues#latency-domains" rel="nofollow noreferrer">https://cloud.google.com/run/docs/issues#latency-domains</a></p>
  <p>Unfortunately it does not say which regions, only ones from which it is <em>worse</em>. I assume very high is in the order of many seconds.</p>
  <p>So:</p>
  <p>a) is it the region the app is in, or the region the user is in? So like if an app is in eu-west1, and the user is in us-east4, does <em>that</em> result in high latency?</p>
  <p>b) have people got some real world examples of numbers?</p>
  <p>c) is the only way to avoid it (given the need for a custom domain) to proxy the request to it from a CDN? Alas Cloudflare does not let you send a custom hostname, but I assume others will. Though not sure if they would permit e.g. POST requests</p>