I wonder if anyone’s tried this, given its low priority, but it seems possible to make a DCE-friendly version of cljs.pprint (at least in the degenerate case where you require it, but don’t really use functionality). Interestingly, doing this seems to lead to a perf gain of 10% for :none and 20% for :advanced, so maybe a patch like this might be of interest for its perf characteristics. See https://dev.clojure.org/jira/browse/CLJS-2885