@snacks @ins0mniak @knapjack @lanodan @lonelyowl13 @vic I would like to be helpful but I had the same experience as everyone else. I think the rule of thumb is more or less the opposite of how you do it with a regular function: with `f(x,y)`, you want x to be the parameter that changes least often, so for `y x f`, you want to define f such that the top of the stack is the least likely to change.