Day of Infamy is in alpha which means that it is not fully optimized.
There are certain things you can do to make the game run faster, without necessarily making the game look a lot worse. Below are a list of suggested video settings changes, which we would recommend reducing one at a time to see if it makes a difference.
1. Effect Detail / Soft Particles - If you notice your frames dropping when a lot of explosions, bullet impacts, and other action is happening on screen.
2. Scope Detail - If you notice your frames dropping when using magnified optics.
3. Global Shadow Quality and Model / Texture Detail - If after adjusting the above, you still have low frames, try lowering these as a last resort. They will have a more profound impact on performance all around, but will also result in a lower quality visual experience.