DistanceOptimizer

using UnityEngine;
using UnityEngine.UI;
using System.Collections.Generic;

public class DistanceOptimizer : MonoBehaviour
{
    public Transform player;
    public float renderDistance = 100f;
    public float simulationDistance = 150f;

    public List<GameObject> excludedObjects;
    public List<MonoBehaviour> excludedScripts;

    private void Update()
    {
        if (player == null)
            return;

        // Calculate the squared distances
        float sqrRenderDistance = renderDistance * renderDistance;
        float sqrSimulationDistance = simulationDistance * simulationDistance;

        // Find all horses and riders
        GameObject[] horses = GameObject.FindGameObjectsWithTag("Horse");
        GameObject[] riders = GameObject.FindGameObjectsWithTag("Rider");

        // Loop through all of the horses
        foreach (GameObject horse in horses)
        {
            // Calculate the distance between the horse and the player
            float sqrHorseDistance = (horse.transform.position - player.position).sqrMagnitude;

            // Loop through all riders
            foreach (GameObject rider in riders)
            {
                // Calculate the squared distance between the rider and the player
                float sqrRiderDistance = (rider.transform.position - player.position).sqrMagnitude;

                // Determine the closest distance to the player between the horse and rider
                float sqrClosestDistance = Mathf.Min(sqrHorseDistance, sqrRiderDistance);

                // Disable rendering if beyond render distance
                Renderer renderer = rider.GetComponent<Renderer>();
                if (renderer != null)
                {
                    renderer.enabled = sqrClosestDistance <= sqrRenderDistance;
                }

                // Disable simulation if beyond simulation distance
                foreach (MonoBehaviour script in rider.GetComponents<MonoBehaviour>())
                {
                    if (script != this)
                    {
                        script.enabled = sqrClosestDistance <= sqrSimulationDistance;
                    }
                }
            }
        }
    }
}