I was messing with the editor I am learning and I imported your domination (although it does not work correctly on baghdad), but to see some action on the map.
My issues which I am sure are the same for everyone is I can play most maps fine especially the official maps on almost all high settings and some with full view distance.... BUT....there's always something about this game...
Experimenting with such a large amount of AI on a mp like Baghdad is great if your on foot in a land vehicle and even in some cases a helicopter (well not so much), but anything ground moving, soldier, tank, etc works pretty much the same GREAT even with tuns of AI.
The problem is the flying.... :( sadly if you have an active map with aircraft, AI, helo AI, ground units in battle etc etc.. and really I mean a lot like 50 + units and aircraft the game just locks up un playable even switching view distance almost to off.
So this really has to be taken into consideration in large maps I guess.
I have been researching this problem for a while and mostly people agree there is two issues here:
1. AI = massive CPU power especially when engaged in battle with one another. Seems like the more complex the script obviously the harder the CPU has to work, and I have heard (not confirmed) that the game was not designed for multi-core processors?
2. CPU / Computer Specs = well all over the net is the great debate but the most common situation is that the CPU and or GPU can not process the AI fast enough which is the persons hardware if it is substandard, or its the game not coded to make use of the competent hardware, so the situation depends on the persons specs.
For me its a little of both I guess I have an i5 4 gb ram win7 64 bit, ati 5870 using drivers 10.5 (10.8 caused nothing but stutter on arma2 and FSX), and DX 9 - 11.
As great as the game is I guess we get spoiled of course I like to pilot jets in the game and I want a large enviroment no fps slow down and view distance to the moon, I guess we have to wait till the computer specs and the game coding is more polished then we can get what we all want.
anyway thank you looking fwd to the domination on this map!