I used to play T72 Iron Warrior aswell that damn fps kept me worried instead of the enemy

. It could be a classic but the implementation fell short of everybody's expectation. Perhaps a problem with an inefficient 3D engine? Though the fps is quite okay(i.e, improved) if you're running it on a new rig these days.
Since I play SB Pro PE I never looked back. I heard that eSim(SB Pro PE devs) is going to add either the T80 or T72 to be playable. If you like tanks get SB Pro PE. Right now it's the only worthy tank sim around.