1.Optimozation performance was slightly improved, but that issue needs much more further improves.
2.I think that game needs better graphic of stones, scops, player models and so on, sometimes textures loading during game independently of quality that i've chosen.
3.IMHO guns needs some increasing of damage, i`ve admitted that it takes more shots to kill smb from for example SKS or AKM comparing with previous the insurgency game.