If you are using cd to change directory then you are doing it wrong. fasd is an alternative tool which will make you 10x faster. fasd maintains a list of frequently accessed directories and does a fuzzy jump and jumps to that directory.
I have added alias "j" to
fasd_cd -d fast jump to directories
Faster open file
I have added alias "vi" to
fasd -f -e 'emacsclient -t' fast find my recently accessed file and open it.