It may look similar to Black Shark without all the bells and whistles but comparing DCS A-10C to DCS Black Shark is like comparing an apple to an orange. Cosmetic changes are not the only changes that went on jtmedina. Again as many have said the Open Beta that we are currently using is not OPTIMIZED. So the FPS that you are seeing now may not be indicative of the FPS that you will see in the Gold version.
It would be more constructive if someone created a benchmark (created a mission, decided on global graphical settings to test, etc) for everyone to use to compare graphical performance.