[huahaiy]

Merged your PR. Thank you! If you do not know Clojure, that's fine, just outline what you want to do in Java, I can translate that into Clojure. Thanks.

To be honest, all your proposed changes would not make material difference, for algorithmic differences cannot be made up by implementation details.

As has already been demonstrated, T-Wand is implemented in a much slower language, Clojure. Clojure is implemented on top of JVM, it cannot possibly beat the same algorithm written in optimized Java. The only way to make a difference is to change the algorithm. So all your suggestions would not make a difference.