monfresh on Twitter: "Running Puma + rack-timeout on Heroku and seeing occasional high response times? Try removing rack-timeout: https://t.co/O0NHvcMdqf"
Configuring Puma, Unicorn and Passenger for Maximum Efficiency
Request timeouts (H12's) when switching from Unicorn to Puma on Heroku · Issue #681 · puma/puma · GitHub
Puma not starting after EC2 restart,bundler: command not found: puma - Stack Overflow