A scene with dynamic animation might play slowly because of intensive computations. The following sections describe ways to speed playback. Note that dynamic animation doesn’t include motion from keys, motion paths, non-particle shape expressions, deformers, and non-rigid body constraints.
If your dynamic animation looks choppy during playback, make sure the Playback speed is set to Play every frame in the Time Slider page of the Window > Settings/Preferences > Preferences window. This ensures that Maya won’t skip frames, which is often a cause of the problem.