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30FPS is the target on PlayStation 4, but it can dip well below this--Digital Foundry reported one sequence when it fell to 13FPS--when the game engine is stressed. This can happen when you land on a new planet and then immediately boost across the surface, near to the ground.
"In this case, the PS4 is struggling to meet the 33.3ms per-frame render time, while generating new scenery and details on the fly," the report said. "These are calculations made a split-second before revealing the new terrain or object, and when it can't keep up, we see dips to the 20FPS line, and sometimes even lower."
