Denis:
My framerate drop is approx. 10 -20 %, but that doesn't matter a lot, because the game was pretty unplayable before updating. To verify this I uninstalled the game yesterday, installed version 1 and tried different things, then patched the game and tried the same things. (from 7-13 to 6-10 fps - on a computer, that should be able to handle SSE and doesn't have any problems running other simulations or demanding software)
1. My ingame AA-setting is 'none" - zero, which looks quite odd, like playing a game 10 years ago.
2. I cant reduce the AA-settings further, but the framerate of the start screen reduces dramatically when I raise the AA-level (from ~22 to ~14 fps)
3. Yes - of course I have tried this option before - with no significant impact, whether before nor after the update.
BTW - I tested this while writing this post. The first attempt was first core mission in Hamburg. Like so many times before the engines refused to work, although the controls on the screen moved. This time there was no sound (which admittedly is better than the annoying bow splashing, which usually is heard when the engines don't work).