setEffectiveTimeScale( timeScale ) {

		this.timeScale = timeScale;
		this._effectiveTimeScale = this.paused ? 0 : timeScale;

		return this.stopWarping();

	}
Sets the effective time scale of this action.

An action has no effect and thus an effective time scale of zero when the
action is paused.

@param {number} timeScale - The time scale to set.
@return {AnimationAction} A reference to this animation action.