performance: remove props if they have no modules left

RasterPropMonitor/Auxiliary modules/PropBatcher.cs

@@ -1,10 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
-using System.Reflection.Emit;
-using System.Text;
-using System.Threading.Tasks;
-using JetBrains.Annotations;
 using TMPro;
 using UnityEngine;
 
@@ -180,6 +175,20 @@ public override void OnLoad(ConfigNode node)
                     }
                 }
 
+                // if the prop doesn't have any modules left (or never had any to start),
+                // just attach it to the internal model and remove the prop so we can avoid calling update etc.
+                if (keepProp && oldProp.internalModules.Count == 0)
+                {
+                    var modelTransform = oldProp.transform.Find("model");
+                    if (modelTransform != null)
+                    {
+                        modelTransform.SetParent(internalModel.transform.Find("model"), true);
+                    }
+
+                    JUtil.LogMessage(null, "PROP_BATCH: removing prop {0} because it has no modules left", oldProp.propName);
+                    keepProp = false;
+                }
+
                 if (keepProp)
                 {
                     oldProp.propID = newProps.Count;