Best server is going to vary on your preferences and workload. Puma is a great multithreaded server, and it can do fork based workers as well. But unicorn is th

Best server is going to vary on your preferences and workload. Puma is a great multithreaded server, and it can do fork based workers as well. But unicorn is the go to for process/fork based workers. Falcon is newer and built on libraries that use the new fibers api. Not sure about ractors, but the code is there, have a look