This lets you make brush animations loop continuously. For more information, see Loop brush animations.
Paint Effects > Brush Animation > Loop Brush Animation >
These are the options in the Brush Animation Looping Options window.
Indicates how many frames you want to loop through the brush animation.
If the brush has turbulence, set the Turbulence SpeedMult value to increase the turbulence speed.
If the brush has flow animation, set the Flow SpeedMult value to make the flow faster.