Response Time Delay - fave77/pbchess GitHub Wiki

The backend server for pbchess is hosted on Heroku's free dyno version, which sleeps after 30 mins of inactivity. Due to this reason, you might experience a little longer delay in your response time for the very first request (involving a call to the /api) as the idle server changes state from down to up.

However, the response time for subsequent requests (if made within 30 mins) will be as per usual time, if not faster.