To be honest I'm impressed with how good this game can look maxed out. I have discovered that the grass density is one of the most performance impacting settings so I advise settings it to medium so it looks better then low. the rest will impact performance a fair bit but it's not as much as a sacrifice so if you can run it I would keep everything else on ultra so image looks great. otherwise my OP5t 835/6GB runs this with average of 25-30fps soo..... I would recommend at least OP6/t for playable 30+ fps experience on custom graphics settings.
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