I've been using an Every X seconds Event while my characters chase another character. This allows the Find path and Move along path Actions to do their thing and not hamper the other, since it takes a short time to calculate the path.
I've also set up actions to enable/disable the Pathfinding behavior...I'm not entirely sure if this works well, or at all, but it might be worth testing.
I've also been advised to employ the Trigger Once Event to prevent successive calls on the Find path Event from triggering too soon, cancelling out Move along path because it's still calculating. You might want to try that.
I'm also personally curious about how long a single call on Find path takes on average to calculate. I know it's dependent upon the distance and number of obstacles, etc, but what's a good mean time?