Yep, it was game changer for me, if you don’t set a limit your game will always try to have the maximum of FPS and your CPU or GPU or both (depending of your specs) will always be running 100%, in some case that’s can cause slutters or just FPS drop if you move your camera, at big handmade airports, with certain aircraft etc.. Setting a limit will decrease the CPU/GPU load and let the game engine breathe.
But SU4 improved a lot the overall performance, so some things in this topic can now be outdated, SU3 was a FPS killer.