@bhauman FWIW, while it would be much faster, we can’t have a directly-reducible version of tree-seq. Details are in the last comment in https://dev.clojure.org/jira/browse/CLJS-2464

You can always define your own tree-seq' as illustrated here: https://gist.github.com/mfikes/cc1d1fac47e7dc112b0b9f4e3de11eae

@mfikes coolio, thanks for the update