I was prepared to release a new FreeBSD 6.1-based Sguil virtual machine today, but I ran into an old problem. The guest OS runs at about half speed on a Windows XP SP2 host running VMware Server 1.0.0 build-28343. I am apparently not the only person with this problem; a #snort-gui regular mentioned running ntpdate every 3 seconds (!!) to mitigate this problem. I posted this Vmware forum question to see if anyone responds with similar experiences.”]
Source: https://taosecurity.blogspot.com/2006/07/slow-time-with-freebsd-61-guest-on.html