Hi,
Without more information on what actions and how you use them, it's going to be difficult to give advices.
It could well be something else, have you ruled out the rest? that is even if your character does nothing ( playmaker out of the game), does the framerate goes up back to 30? Most time, it could be that you are doing something costly either with meshes, textures, shaders, or physics, and that's what cause the lag, not the use playmaker per say.
Do you have Unity Pro? if so, can you run the profiler, you'll see what takes the most time, and you should work on that aspect then.
bye,
Jean