A sample MonoBehaviour for Spine-Unity that holds a collection of SkeletonAnimation components and updates their animation at a certain limited rate.

SampleManualUpdate.cs

using UnityEngine;
using System.Collections.Generic;

namespace Spine.Unity.Examples {
	public class SampleManualUpdate : MonoBehaviour {

		[Range(0f, 1/8f)]
		[Tooltip("To specify a framerate, type 1/framerate in the inspector text box.")]
		public float timeBetweenFrames = 1f/24f; //24 fps
		public List<SkeletonAnimation> components;

		float timeOfLastUpdate;
		float accumulator;

		bool doLateUpdate;

		void OnValidate () {
			if (timeBetweenFrames < 0)
				timeBetweenFrames = 0;
		}

		void OnEnable () {
			timeOfLastUpdate = Time.time;
		}

		void Start () {
			for (int i = 0, n = components.Count; i < n; i++) {
				var skeletonAnimation = components[i];
				skeletonAnimation.Initialize(false);
				skeletonAnimation.clearStateOnDisable = false;
				skeletonAnimation.enabled = false;
				skeletonAnimation.Update(0);
				skeletonAnimation.LateUpdate();
			}
		}

		void Update () {
			if (timeBetweenFrames <= 0) return;
			accumulator += Time.deltaTime;

			bool doUpdate = false;
			if (accumulator > timeBetweenFrames) {
				accumulator = accumulator % timeBetweenFrames;
				doUpdate = true;
			}

			if (doUpdate) {
				float time = Time.time;
				float updateDelta = time - timeOfLastUpdate;
				for (int i = 0, n = components.Count; i < n; i++)
					components[i].Update(updateDelta); // Update AnimationState

				doLateUpdate = true;
				timeOfLastUpdate = time;
			}
		}

		void LateUpdate () {
			if (doLateUpdate) {
				for (int i = 0, n = components.Count; i < n; i++)
					components[i].LateUpdate(); // Generate Mesh

				doLateUpdate = false;
			}
		}
	}

}