Just wanted to post my feedback on the 8.3 beta since I've had it running now at home for the past few weeks.
The beta is running on a 2 vCPU / 6GB RAM virtual machine on VMware ESXi 4. Probably a bit overspecced but it performs like a dream.
Haven't encountered any bugs yet but I do want to report that the Web Security performance issue William reported that required activating the local content cache, doesn't seem to be present in the beta.
On older releases (v7, v8.1x, v8.2x) I had to enable the local content filter cache with transparent mode otherwise my internet connection became pretty well non-functional. With a pristine beta install, the problem is no longer there.