While 60 fps is the standard acceptable rates according to many game reviews you could not expect the same if you have similar specification of rig like mine so for me the acceptable playable rates will be around 30 fps. To get that I'm using AMD Gaving Evolve software (Raptor) to get the best optmized settings. Using that basically lowered a few settings like Shadows and Water to low and reducing the Shader Model from 5 to 4.1 while maintaining other settings basically the same except Trees from Extreme to Ultra.
The result is these little tweaks gives nearly double the frame rates per second as seen below. When we have a low to mid range rig obviously we have to sacrifice graphical beauty to make our games playable.
My final though is that this game will probably not have another major update though I'm hoping with the release of Windows 10 and DirectX 12 another optimization update will be release by the Creative Assembly. I am also interested to run another benchmark once the Steam OS is finally comes out and we will see that time whether an OS build specifically for gaming will have a major impact on games.