Created attachment 152796 [details]
var log messages
Upgrade of FreeBSD 10.1-RELEASE-p8 to FreeBSD 10.1-RELEASE-p16 resulted in pcbsd kernel: calcru: runtime went backwards from usec to usec for pid.
Notable effects on FreeBSD 10.1-RELEASE-p16 are slow clock and latency in system's responsiveness.
Using previous boot environment FreeBSD 10.1-RELEASE-p8 gives no such errors.
Please find attached log.