title: create-react-app loading slowly of my production server
body: <p>I am try to search this question by google.But not helpful for me.
  I hava a demo of create-react-app.
  Run it in localhost(<code>npm start</code>), that work well when browser disable cache.for example:
  <a href="https://i.stack.imgur.com/rfORT.png" rel="nofollow noreferrer">localhost</a></p>
  
  <p>The step was run <code>npm run build</code> in localhost.then <code>scp -r build server:/home/deploy/app/</code>.run it by nginx.
  Then open the browser to run,that initialization or refresh slowly when disable cache too. for example:
  <a href="https://i.stack.imgur.com/iyWNw.png" rel="nofollow noreferrer">server</a></p>
  
  <p>you could find load 500KB js file need 15seconds in server.</p>
  
  <p>I guess that is a relationship with bandwidth. My server bandwidth was 1M/s.but i'm not sure.</p>
  
  <p>ps: I'm sorry I forgot to declare the specific environment, but I did these steps.</p>