Movement. Depends on where they r occurring & in what. Please clarify. In general, involuntary one occur in neurological disorders such as parkinson disease, or induced by medications such as antipsychotics.
Slow and fast. Movement disorders are involuntary movements of muscle. They are grossly divided into slowed movement (i.e. Parkinson disease and similar disorders) and fast movements (i.e. Chorea such as in huntington disease). There are a large number of these diseases, but the two most common are essential tremor and parkinson disease.