Another Gig of Ram should seal the Deal.
A friend of mine in playing it on a Intel 2.4 GHz(single core) with 2 Gigs or Ram (DDR2 333) and Nvidia 6 with 256 Video Ram, all graphics options set at Low, unit size option at Large, no extras (HDR etc), and rather older HDD too.
Ram Standard is 2 Gigs now days.
Also do not neglect Hard Disk Drives, older slower drives will make load times longer, and could also make you lag a bit, more Ram helps as it reduces the frequency the game has to Load things, still, there are limits to that. Defrag your Drives of optimal performance.
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