Okay, this one's a bugger.
As a 'real' flightsimmer (MSFS MMO; IVAO), I must say, that this was kind of careless development. Most of the real flightsimmers (as opposed to 'arcade kids' or 'blue jeans pilots') have extraordinarily good machines. Many are employing SLI/crossfire technology, and many are using Matrox triplehead oder eyefinity setups, along with expensive sticks, rudders, and headtrackers. This is not a secret. I just don't get why SLI/crossfire can get through to the final product without any testing ...
Luckily, I have a second machine with a single GPU. But not everybody can afford a downgrade
This is not about the game
supporting SLI/crossfire but about bad performance
due to a multi GPU setup. It just shouldn't be like that.
but after reading that the epilepsy filter problem was resolved in favor of the community, I am quite convinced that there will be a fix for this problem, too.