I have completed the game on rpcs3 (0.0.5-6694) without relevant problem. Having played the game on ps3 already, i had some means of comparison.
The game run at stable 30fps on Vulkan at 1440p and "4" Preferred SPU Threads, with little slowdowns or stuttering. I tried OpenGL but the performance was worse, mainly the stuttering due to shader compilation.
CPU: i7 6700K (slightly overclocked), GTX 980 Ti (factory overclocked), Win 10
I'm reporting everything i can remember, for users and devs, but i think there are a few things i forgot.
Don't worry about the crashes for this game as it loads every time you do anything ((and it makes you save souls).
Bugs/problems:
-Playable character shield is invisible (OpenGL and Vulkan)
-At leats 2 objects were invisible in the game, i've noticed because they still had collisions (proved with Vulkan, but i assume also with OpenGL)
1) Fool's Idol Archstone: The gigantic meat blob in the middle of the tower, but only you cut bot chains and it drops on the bottom (visible at:
https://youtu.be/l8Pz93x1Z64?t=26m38s)
2) Adjudicator Archstone: The dead flying rays on the floor (visible at:
https://youtu.be/j2Tz0z1ioSE?t=8m52s)
-Slugs in Shrine of Storms (and some other things i can't remember now) were extremely bright and created excessive bloom (I have screenshots). Also slugs brightness was flickering between frames (proved with Vulkan, but i assume also with OpenGL)
-Looking at the sun creates an extremely high bloom/rays (OpenGL and Vulkan)
-Corrupted textures when after reloading the map after dying (corruptions were different at every load, and would later disappear) (I have screenshots)
Crashes:
-Crashes when loading after death (only proved with Vulkan)
-Crashes when loading a new zone from the nexus (happened with both Vulkan and OpenGL, i had to load another zone and then go back to the nexus and try to load the one i originally wanted again)
-Crashes after playing too long, preceded by Windows Cursor showing the "loading" circle animation (only experienced with Vulkan), that then only happen if you double click on the game window, and go away after some time if you didn't
Unsure:
-The gargoyles in Adjudicator Archstone had some really weird behaviour, especially when attempting to land on air, but i can't say that this doesn't happen on ps3
-Some static dead bodies (the ones with a reward you can pick up) in Armor Spider Archstone were rendering weird from a distance (i have screenshots). I don't think this happens on ps3.
-Some overlapping transparent objects gave weird results, i'm not sure if this happened on ps3 but anyway i can't remember what it was.
-Depth of field seemed to be fine, but i can't guaranteed it scales perfectly with the resolution
Improvable:
-Input is sometimes ignored (maybe when in between frames?), i had a feeling that this was an rpcs3 related problem
-When talking to someone the game "hands" of about 0.3 seconds (to load the audio files?)
-Slowdowns when breaking too many things at the same time (also happens on ps3 but not as much)