Originally planned as an extension DLC for Dying Light 2: Staying Human, Dying Light: The Beast has ultimately morphed into a full game in its own right, albeit smaller in scope and far more linear than either of its predecessors. The developer, Techland, has stuck to using its internal C-Engine software package, though it's been "heavily modified and upgraded" since its implementation in DL2...
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Dying Light: The Beast PC performance analysis: Decent frame rates all round, nice graphics, and stutters only on low VRAM GPUs
Source: PC Gamer (opens in a new tab)