add check to not recalculate the same textures twice

Runtime/PSXObjectExporter.cs

@@ -19,8 +19,11 @@ namespace SplashEdit.RuntimeCode
             Renderer renderer = GetComponent<Renderer>();
             if (renderer.sharedMaterial != null && renderer.sharedMaterial.mainTexture is Texture2D texture)
             {
-                Texture = PSXTexture2D.CreateFromTexture2D(texture, BitDepth);
-                Texture.OriginalTexture = texture; // Stores reference to the original texture
+                if (Texture == null || Texture.NeedUpdate(BitDepth, texture))
+                {
+                    Texture = PSXTexture2D.CreateFromTexture2D(texture, BitDepth);
+                    Texture.OriginalTexture = texture; // Stores reference to the original texture
+                }
             }
             else
             {

Runtime/PSXTexture2D.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using UnityEngine;
 
@@ -275,5 +276,15 @@ namespace SplashEdit.RuntimeCode
             return vramTexture;
 
         }
+        /// <summary>
+        /// Check if we need to update stored texture
+        /// </summary>
+        /// <param name="bitDepth">new settings for color bit depth</param>
+        /// <param name="texture">new texture</param>
+        /// <returns>return true if sored texture is different from a new one</returns>
+        internal bool NeedUpdate(PSXBPP bitDepth, Texture2D texture)
+        {
+            return BitDepth != bitDepth || texture.GetInstanceID() != texture.GetInstanceID();
+        }
     }
 }