[JoshuaJB]

That's almost entirely fixed with this release.

Since I help develop the game, I'm rather biased, but I think that it's as stable or more so than most triple-A titles released today.

[MrBra]

What I observed is that from time to time it slows down to almost unplayable but this lasts some 30 seconds and then it get backs to normal. This happens once every 15-20 mins. Hope it helps.