The physics module allows you to simulate basic physics on the fur of your characters. It is entirely run on the GPU so its performance impact is extremely low, and its memory footprint can be adjusted by changing the quality of the Physics Simulation. Low and Very Low qualities will be enough for most models and in its lowest setting the Physics module uses less than 10Kb of memory for each material using the physics simulation.
To use it, simply enable the module in the Settings tab and then enable the simulation for the corresponding fur materials in the Physics Module tab.
The different settings for Physics are shared across all fur materials. Physics Sensitivity controls how much the fur will respond to smaller changes in motion and animation, while the Physics Strength Multiplier adjusts the overall strength of the physics based motion.