Well, it's an Apple device.[br]
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There are lots of things it could be, the abysmal 1GHz CPU definitely doesn't help, even for 2011 that is shockingly slow.[br]
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The RAM is pretty slow at 1333MHz, but that should only be an issue during loading screens.[br]
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The biggest factor here, besides being made by Apple, is this computer does not have a graphics card, and relies on the CPUs internal video processor to produce the most basic rendering abilities. [br]
Like showing the desktop and application windows, and some basic 3D display.[br]
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Trying to game on embedded graphics is extremely painful, either play older games, 1998-2003 era 3D games should run at almost full speed on this machine, or see if Apple sells a dongle that lets you plug in an external graphics card.[br]
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If you have the money, build a gaming rig for games, and just use this laptop for what it was intended for, office programs.