Why does a computer run a game poorly, but is able to show a video of it perfectly fine
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Why is it easier to read a book than to write one?
In a video all the work of making it look like that has already been done—the computer just had to read the instructions that tell it what the video should look like. With a game it has to figure out for itself what has to go in the screen, which is a lot harder. The final result—what appears on the screen—may be the same but the path to get there is very different.
(This is also why cutscenes sometimes look a lot better than the rest of the game—they’ve been rendered ahead of time and are just videos that are being played back)
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