Small update. I haven't played this game a whole lot, because I'll most likely get it when I buy a PS4 next year. My last impressions are that it's quite playable. On the world map, however, there is lag. I haven't messed around with the settings further than before, but I'm confident that if you put them on low settings for many of them, it will suffice.
Again, this is on a Surface Pro 3, Core i5, 4gb ram, 128gb ssd
Game was installed on my USB3 external 500gb hard drive, if that makes any difference.