Do not know if it is bug or my videocard, but with a new water it is often a 2-3 sec. freezes. They stop only when in video settings I switch off "Animated water".
Seems ki84 flaps do not work correctly, or at least work strange -- if you make it 2 or 3 notches of flaps it is no difference to the lift at all, but when it is full flaps you can feel the effect clearly.
T-34 has a strange dammage model, it is like every hit with ap round kills your track. Also, at full speed T-34 also sometimes stops as if smash into a wall, though it is visually absolutly nothing ahead of you, and when you start gear again it goes ahead without problems.
Hope it helps. Actually it is a great version, worth all those months of waiting.