Been wandering around the world, and (if I'm reading this correctly) after around 15 hours of play (save game shows 015.32.05 - hours.minutes.seconds?) it started stuttering - as if a virus checker or something were working in the background, but it isn't. Up to a minute between freezing before keyboard commands start working again, although the mouse control remains active and I can look around at will, just not move/dialog/inventory/anything requiring a keyboard command.
Once it comes back, it may or may not immediately stutter again.
Game running with no mods, just skywind-patch.esp and skywind.esm, game version shown in lower left corner is 22.214.171.124.8
skywind - patch.bsa 11/2/2013, 2518kb
skywind - patch.esp 4/3/2013, 32kb
skywind.bsa 1/10/2014, 439,950kb
skywind.esm 11/1/2013, 126,217kb