Portal 2 Lag

I got Portal 2, and in the main story areas with the giant GLaDOS chamber and things like that. I looked up the system requirements, and technically, I have the proper video card memory and CPU speed and stuff, but it still lags in the large areas. I only have an integrated graphics on the CPU. Is that what’s causing it?

What do you mean “technically” meet the requirements? I think it says in the requirements that integrated anything is below the requirements.

I mean that the video memory and shaders and stuff are up to par, the only difference between my computer and the minimum requirements is that the video is integrated as opposed to being a discrete card

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