Games work by drawing a bunch of pictures. The number of pictures (i.e. frames) per second is called framerate.
Every time something in the game moves, the game needs to run a bunch of code to figure out how to draw the next picture. Weaker computers are slower at performing calculations, so it takes longer to run all the necessary code between each frame, making the framerate slower.
Sometimes the problem is in your hardware. You just don’t have a powerful enough computer. Other times, the code is badly written, so it takes an unnecessarily long amount of time between each frame. That can be fixed with a patch by optimizing the code.
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