Yup, as Suntan said, it's the old one. The reason it was sluggish was because it was a very early build for the device and was not final software. Also, we know that that Bionic had problems of some sort which led to the revision(most likely the Tegra 2 not playing nice with LTE)
It's amazing how much the original lagged, test version or not that was still bad. I can see it was a good idea to revise it if it is anywhere near as smooth as the droid 3.