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Some days ago, I installed project IGI 1 in my pc and surprisingly I found that it lags very much even in the lowest settings possible. I played the game before without any problem in a laptop with i3 2nd gen. But now it lags on my desktop containing a dual core cpu with 4GB RAM and Intel HD Graphics. I even seen these lags on a friend pc containing i3 4th gen. Note that any newer games works just fine, only problem with this old game. IGI 2 has no problems.

So... any fix for it?