Air-to-air and air-to-ground radar modes assist in target acquisition and tracking. 3. Distributed Interactive Simulation (DIS)
On modern hardware, v4.0 runs exceptionally well because it lacks the heavy shadow rendering techniques introduced in v5. However, it is heavily CPU-dependent (like its predecessors). If you are running this specific build today, you will likely find it runs smoother than Microsoft Flight Simulator (2020) on mid Prepar3D v4 Professional Plus 4.0.23.21468