I don't think it was a primary motivation, but at least the slowness of mtl is mentioned as one of the motivations for the existence of the library. https://ha

I don't think it was a primary motivation, but at least the slowness of mtl is mentioned as one of the motivations for the existence of the library. https://hackage.haskell.org/package/effectful#what-about-mtl https://hackage.haskell.org/package/effectful#what-about-mtl