Actually, gprof seems to be unhappy about the number of call to strbuf_grow() in map_user() (25% of the time spent in map_user() is spent in strbuf_grow()). That probably comes from the repeated call to strbuf_addch() when lowering the email address. At this point, we are also copying the '\0' for every char we add, doubling the copy. This may not be much of a difference, but it seems to be called 15 millions times when running: $ git log --author='Junio C Hamano' --use-mailmap Maybe we should come up with another way to lower this email address afterall. -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html