Started a new game after Patch 6 and immediately noticed some of these issues.
The vendor issue is MAJOR as it happens with every vendor. At least 5-10 second lag between the interface appearing and the merchant inventory loading. Gold for both player and vendor shows zero in the meantime. Gives it a real amateur hour feel.
The group stealth is also completely ridiculous and slows down the flow of gameplay significantly as the only way to individually stealth someone is to manually do it through the radial menu.
This may be the worst quality patch so far. Which is saying a lot because Patch 4 set the bar high in that regard.