I think that overstates it a bit, but yes, there are problems with Unicorn and slow clients. We're investigating: https://blog.heroku.com/archives/2013/4/3/rout

I think that overstates it a bit, but yes, there are problems with Unicorn and slow clients. We're investigating: https://blog.heroku.com/archives/2013/4/3/routing_and_web_performance_on_heroku_a_faq#comment-850974645 https://blog.heroku.com/archives/2013/4/3/routing_and_web_pe... If this is an immediate problem for you, it might be worth your while to make your app threadsafe, which gives you more concurrent webserver options.