I install the version off here the 1.2.7,23803 version
Windows 7 64 bit
intel I7 2700 K not OC
7970 gpu
16 GB 1666 mhz kingston ram
Install on SSD HDD
I ask around in the dcs world forum and all they sayd was that its a known problem and prob couse by DirecktX 9 and alot are awaiting the edge engine with DX11 to fix it (hopefully)
Basiclly i can fly fine a trpi around the world with 100 fps average...as soon as a unit comes on screen i jump down to 15 -25 fps... but only if i look at it...if i look to the right or anywhere away from the unit i run the game fine again.
im a sad boy because i finally found the perfekt sim but cant play it yet :(
It dosent effekt my fps weather i play it on high or low settings...