Technically, it's pretty much a potato past its sell by date

.
i5-4460, 16gb ram, 2x GTX-760 (one dedicated PhysX, no idea if that helps with BL*). Main issue for BL is GPU - on mostly low settings with a couple tweaked a fraction up, uses almost all available GPU ram. Don't usually have FPS showing on this PC, but just checked and getting a stable 45-48 on campaign map and a large battle; 60 (capped, screen tears if don't cap on my why-did-I-spend-that-much GSync monitor, when I actually need a better GPU) in menus. Compared to recent 1.5.7, subjectively seems smoother, didn't notice as much stuttering and menus definitely less laggy.
Will check on laptop tomorrow, which has a significantly better GPU, but was getting about 35 FPS on medium settings on 1.5.7 (much higher res, so low settings look rougher)...
*According to a wiki page for games with PhysX support, Bannerlord is listed - which surprised me slightly.