Modder BlurredNotions has released a brand new mod for The Witcher 3: Wild Hunt that aims to overhaul/fix the NPC physics for those gaming at or higher than 60fps. So yeah, this is a must-have mod for those that were annoyed by the 30fps physics.
Source: N4G PC The Witcher 3 mod overhauls/fixes NPC physics for playing at 60FPS or higher framerates