Reducing the load from the ChromeOS chrome processes - dnschneid/crouton GitHub Wiki
ChromeOS can run a lot of Chrome processes. If you are working primarily in your crouton chroot, then this can place an excessive load on the system.
I've found that it is possible to kill a lot of these Chrome processes without doing anything damaging (though you will lose any unsaved data on websites in Chrome). These should be the ChromeOS chrome processes: /opt/chrome/chrome/chrome
Try this
ps ax -o sess,pgrp,pid,cmd | awk '$4 ~ /\/chrome$/ { print $3 }' | xargs $nodo kill
Note that if you are running Chrome in your chroot, it may (I haven't tested it) be killed.
PS: if you set a variable nodo=echo
then it is a dry-run.