Tested these by running them with mediavps and the "MassiveBattle2" mission.
Spoilered to not influence others:
Build 1 performed on about the same level as a recent trunk SSE2 build. It seemed to introduce some crackling in the sound playback while in the menu, however-
Build 2 was prone to crashes. First crashed during mission load, then while playing the mission. (Just turning toward the action seems to trigger this)
Build 3, again, crashed on the first try. On the second, it didn't crash, and performance seemed to be about equal to Build 1.
#1 - Didn't notice any difference to "normal" builds.
#2 - Crashes when tech room is opened.
#3 - Crashes when mission starts loading.