Cache misses are not compared to initializing the lisp engine. So, we don't worry so much about them. Also, since the data organization is up to us, we touch on

Cache misses are not compared to initializing the lisp engine. So, we don't worry so much about them. Also, since the data organization is up to us, we touch only what is necessary (well, almost! We are talking about fine-grained locking here, but we modify (mutate) only the datum that needs to be changed).