Trying to be a little bit constructive here, in case I come across as complaining, I took the source for c.d.json and put it into a leiningen project, enabled warn on reflection, and found that several cases of (... (let [c (char i] ... (= c \x) ...) results in Clojure deciding it needs to perform reflection in order to call equals in the comparison with a fixed character. I'm not really sure what the proper solution for this is, but I changed the "let" to (let [c (Character/valueOf (char i)] ...) and the time for my 217KB JSON file dropped from 107 seconds to 2 seconds, or only a little more than twice as slow as clj-json (which clocked in a little under one second for my file).
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