fix: optimize puma configs

config/puma.rb

@@ -1,15 +1,17 @@
-workers Integer(ENV['WEB_CONCURRENCY'] || 2)
-threads_count = Integer(ENV['RAILS_MAX_THREADS'] || 10)
+workers Integer(ENV['WEB_CONCURRENCY'] || 4)
+threads_count = Integer(ENV['RAILS_MAX_THREADS'] || 5)
 threads threads_count, threads_count
 
 preload_app!
 
 rackup      DefaultRackup
 port        ENV['PORT']     || 3000
-environment ENV['RACK_ENV'] || 'development'
+environment ENV['RACK_ENV'] || 'production'
 
 on_worker_boot do
-  # Worker specific setup for Rails 4.1+
-  # See: https://devcenter.heroku.com/articles/deploying-rails-applications-with-the-puma-web-server#on-worker-boot
   ActiveRecord::Base.establish_connection
 end
+
+before_fork do
+  ActiveRecord::Base.connection_pool.disconnect!
+end