i5-3570k @ 4.2 not good enough for Demon's Souls?

I tried Demon's Souls recently and it performed horribly on my system. Rolling or attacking caused framedrops, the game would hang for several seconds constantly and even in the opening FMV the frames were all over the place. The settings were default aside from setting the graphics to Vulkan and Write Color Buffer to ON.

Is this processor not gonna cut it or was I missing a certain magical setting? I didn't mess around with the SPU threads so I'm wondering if those magically fix the FPS.