The playback speed multiplier for the createjs instance managed by this container.
This value multiplied by delta time determines the playback speed.
Add a createjs instance as a child to the specified hierarchy.
Remove the createjs instance from the child.
Whether the playback speed of the createjs instance managed by this container can exceed
1.If the playback speed exceeds
1, more than2frames may progress in one process, but this may result in unexpected behavior depending on the frame script.