[eru]

Well, lists are really slow.

To be more precise: lists in your code can be really fast, if the compiler can find a way to never actually have lists in the binary it produces. If it actually has to have lists at runtime, it's generally not all that fast.

[JoelMcCracken]

Yeah I figured that, but the combinations I was dealing with really weren’t that many.

The problem was https://xmonader.github.io/prolog/2018/12/21/solving-murder-... and trying to solve it with list monad. Someday I hope to get back to it.