My understanding is that invocation of protocol methods incurs about 30% overhead due to the need to look up the appropriate function for the type. I also learned recently that Clojure does not use static type information to do the lookup at compile-time and avoid the overhead. Given that Clojure already does do some type analysis (to optimize Java method invocations), why not do it for protocol invocation as well? Just trying to further my understanding of the Clojure compiler.
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