I had same experience when first trying Patch3beta, but two things pretty much cleared it up:
1. They did a quick hotfix to the patch that helped camera panning between campaign map locations.
2. Started new campaign. I didn't start new just because the patch, it was coincidental.
Between these two changes, running smoothly now...or, perhaps more accurately, at least as smoothly as with Patch 2. At first Patch3beta resulted in some game freezes and CTDs for me, but not any more.
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