title: Heroku postgres is very slow under load
body: <p>I'm deploying an app to the Heroku that uses php and heroku-postgres. App performs about 70-80 queries to the small postgres database (about 10Mb).</p>
  
  <p>I did some load testing using apache bench with 50 concurrent requests. And I found that queries execution time is about 5-8 times slower than without any load. Of course, I checked that tables have correct indexes and queries use them.</p>
  
  <p>I also tried different heroku-postgres plans, but the problem still exists.</p>