Why does a computer run a game poorly, but is able to show a video of it perfectly fine
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By show a video, do you mean like a Youtube video of a let’s play, or an opening cinematic when you start the game?
When running the game, the computer needs to compute the appearance of all the objects that are on screen, along with lighting and particle effects, and any physics that might be applicable as well.
A video is much easier to run. You can sort of think of it as a series of screenshots shown in rapid succession with an audio track accompanying it. All of the processing to create the video was already completed when the file was produced, so your computer just needs to play it back.
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