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Correct me if I'm wrong, but I don't see how is this different from Thin, AFAIK it also uses Ragel for the same purpose.

puma's README wording make it seem like the Ragel parser is some new thing unique to Puma, and doesnt mention Zed. no wonder he hatest rubyists

also, thin has had a --threaded flag for years

Thin's --threaded flag is still considered experimental. Also, spawning a native OS thread per incoming connection is not cheap, either.

At high numbers of concurrent connections, your thread stacks consume a non-trivial amount of ram, too.

thin uses EventMachine and puma uses threads.