As a test, I replaced the mapcat with a plain map in the slow version:
(defn collapse-slow [col pred rep]
(let [f (fn [[x & more :as xs]] (if (pred x) [rep] xs))]
(map f (partition-by #(if (pred %) true) col))))
Is that the concat you were thinking of?
Ignoring that the functions aren't equivalent anymore, it's only a 10-20%
boost.
(Let me know if I misinterpreted your suggestion.)
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