@ R48...
I've been reading on forums of 'other games' that repeated Alt-Tabbing can cause frame rate drops due to the game/graphics card eating up the op system paging file. Also, it's not something that can typically be solved by just throwing extra RAM at it... if it gobbles up 2gigs it'll be happy to continue gobbling more.
From what I've read, it seems that video card drivers and the game software have a lot to do with the paging file and memory. All I can suggest is to make sure your graphics card drivers are up to date and if you have your PF usage set a certain way, try increasing it or setting it back to system managed.
You can check or change your PF usage settings under:
Control panel: System | advanced | performance settings | advanced | virtual memory, click change, and click system managed size, and then restart your computer
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