I am new to FreeBSD and have recently installed it on my Laptop that has 16 Gb of ram. I chose to use ZFS for the hdd and installed mate for my desktop environment. I've noticed that at times the machine will be using over 90 percent of the ram ... typically after I've mounted and external hard drive and transferred data to the internal hdd. I've tried running top from the command line but haven't seen anything jump out as being the culprit. Any pointers would be appreciated.