If I can elaborate just a bit on kazinator's comment: While it's still possible to use cons cells as one's sole data structure in Lisp, no Lisp programmer with

If I can elaborate just a bit on kazinator's comment: While it's still possible to use cons cells as one's sole data structure in Lisp, no Lisp programmer with any experience does that. Making cons cells faster would be like forcing horses to drink Red Bull so they could pull chariots as fast as cars. It's a solved problem -- just use a car (npi) -- and there's no need to abuse any horses.