This picture is a joke because it's subdivided from a lower detail model rather than having actual details added into it. That said, there are a lot more issues than polycount causing this to go turtle speed on high end machines.Law Of Diminishing returns. Polygon count doesn't mean shit especially for porn games. Lots of text and 2d porn games out there that have fewer polygons than Subvers but they do their job better than the FD:OL.
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More polygons is a feature not a quality.