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I have a Compaq Presario CQ62-238DX Notebook PC

ATI Mobility Radeon HD 4250 graphics
AMD Athlon II 2.1 GHz dual-core processor P320
3GB DDR3 RAM (With over a GB of VRAM)
Windows 7 Home Premium (64 Bit)

Granted it isn't the greatest PC of all time or anything, but it should be able to easily run this game at maximum settings according to most sources that I have looked at (including this very site).

requirements: Windows XP or Windows Vista, 1 GHz Processor (1.4 GHz recommended), 256MB RAM (512 recommended), 3D graphics card compatible with DirectX 7 (compatible with DirectX 9 recommended), Mouse, Keyboard.

My PC meets every single one of those requirements, so why in the world am I meeting such intense slowdown in parts of the game (Granted, it isn't constant & doesn't happen everywhere, but the fact that it is happeing at all is incredibly annoying). Even on some of the lower settings I am met with slowdown... granted nowhere near as bad, but still enough to be annoying (especially considering that this is a platformer).