When the Crysis demo was released, everyone started complaining about its incredibly slow performance. Everyone hoped that the demo was merely a half-baked, poorly-optimized shadow of the final game. However, when Crysis itself finally hit the shelves, many were disappointed. It was so slow that unless you had the latest and highest-end PC hardware in the market, you could end up watching a Crysis slideshow instead.
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Source: TechARP