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HTTP DOHC was a proof-of-concept web server showing the use of NIO with native threads in a pure-Common Lisp implementation. In addition, it had a novel architecture based around two distinct thread pools, the first one doing racing accept() on initial connections to handle the initial HTTP request-reply immediately without contention and to do incoming request limiting, and a second thread pool servicing keep-alive requests off of an epoll/kqueue/select socket list. It depends on a patched version of IOLib, found at: https://github.com/vsedach/iolib-simple-mux I've since come to the conclusion that programming effort would be better spent on improving the performance of Hunchentoot, rather than developing a new incompatible web server. If you want to contribute, a good place to start is to write a simple kqueue/epoll interface to be used with usocket (I'm not a fan of IOLib). That can be used to add an NIO-based thread pool to Hunchentoot. Another thing I don't think is worth doing is manual utf8 byte buffer management. That can be accomplished just as efficiently using the existing Common Lisp stream abstractions. What's missing is a convenient string library that works over utf8 byte streams and vectors, and marshalls the implementation's internal string encoding into utf8 at compile-time. This would be sort of like rewriting the Common Lisp string handling functions to use utf8 internally. John Fremlin's irregex package already provides a lot of this. That would work great for getting high throughput on utf8 data, but people that expect your server to also understand utf16 (like pretty much everyone in Asia) will probably be angry at you.