On a base, slim ps4 (I'm assuming a non-x xbox would perform similarly), it's nearly unplayable. The only time it's near 60 is when absolutely nothing is going on, like at base camp and when you're not moving. The game should've been locked at 30 fps on base consoles.
It's been years since I played the last gen version but I don't seem to remember it slowing down quite as much as it is on this version. Gunfights with several enemies slows the frame rate down and any explosion or environmental destruction causes the game to buckle to Just Cause 3 levels of performance. Basically anytime you're doing anything fun the game's terrible frame rate is there looking you right in the face.
I know they upgraded the graphics some but it's pretty obvious that the game was shipped before optimizations of any sort could be implemented. There's no excuse for performance this bad from an up-res rerelease of an almost 10 year old game.
Just thought I'd give a heads up to base console owners thinking about getting the game. Not sure how it runs on the pro/x but it might be a game only for pc gamers so they can brute force through the bad optimization.