Why does a computer run a game poorly, but is able to show a video of it perfectly fine
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Rendering a game means doing all of the computations to build the scene in real time. For example if the game has complex physics simulations, it has to do the simulation before/during every single frame. Whereas a video is just a file which contains the scene which is already finished and all computations are done. Essentially just switching between images (but a lot more complicated than that)
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