Nope. Maybe your hardware is not properly recognized. Or too powerful :)
Try this command line parameters for a start. If it works adjust them.
-maxMem=4096 -cpuCount=4 -exThreads=7.
Or try to find problem more precisely. For example go to AA & PP video settings and turn all options to disabled and sliders to 0. Restart game. If it fixes the problem start turning on options one by one to find the cause.
Try also latest 13.10 Beta driver.

I have a stutter with lot of smoke grenades around (8-10) but not dropping lower ~20fps.

AFAIK if your video card is not NVIDIA, PhysX computing is handled by CPU. I have an ATI Radeon HD 5870 card. Playing VERY HIGH @ 1080p one monitor, no such issue. Using Catalyst 13.4. I believe PhysX in ArmA 3 can not be turned off as it is part of gameplay (vehicles behaviour for example). What is your CPU, driver version. Try it on 1 monitor. Try different driver versions. Wait for newest beta driver to support ArmA 3 Eyefinity.

I am sorry. Fixed video.

You, guys, think that making a 64 bit version of 13 years old code is simple, like adjusting some flag in compiler? Heavy real-time, threaded application? Really?

I strongly disagree. Commander does not need this information, he can give you permission to leave your position to resupply. He will not babysitting with you and your ammunition.

Either fight or hide or run away. There must not be a scenario with AI doing nothing with enemy in sight.

C'mon, devs. I believe it is not hard to exclude "LOGIC" side from autogrouping. It's been a month already :(
Also player can group with markers. Now group with marker, delete it and observe trash in mission sqm.

It is tricky but you can go through walls using step over.

http://youtu.be/VCgySiTMAUg

Look at the wall, hit V, close to the end of animation run away from the wall. You will be pushed in.

Confirmed. Ai swimming through the pier by will. No matter if he spawned inside or outside. But it has nothing with texture. Summary field is confusing.

Not a bug. Objects are spawning at ground/water level. To spawn on other objects or different building floors try adjusting ELEVATION parameter in editor's unit menu.

Devs, please, make this grass burn to smoke out enemy.