I think it will be fine, just with a few less effects. Perhaps Jorkilla can post a little exert for you, but I think it will hold up well.
There is the odd pop in and [very, very] rare judder, but it has only happened in random areas. Some of the very best looking areas I've seen in a game, stuffed with detail and lighting, are absolutely rock solid, even amidst a huge battle with numerous dinosaurs. That's why I posited earlier that it might have been rushed out the door, towards the end of an obviously ambitious design effort.
Fighting the "machine" equivalent of a pterodactyl and sabre tooth tiger at the same time, is really difficult, but however many times you die, beating them feels properly doable because the weapons are so intuitive. Particularly with the concentration skill enabled to slow down time when you need to.