I can actually run 2.5, both in Caucasus and Nevada but I have to realistically turn settings down (especially the AA) to get it to run with a decent FPS ~60 most times, but dips to 35-40 during larger engagements, and it looking worse and ugly shimmering seems a step back.
Granted, EDGE looks a million miles better than old engine, but i can run 1.5 with over 100 FPS with dozens of units at a time - on 2.5 same type of mission, it is stuttering and looking borderline crap...hence why i wanted to roll it back to at least use the NTTR again.
At least until a PC upgrade can be sorted ( My rig is at end of life i think ;) )