Fixes content service/repository for moving things correctly along with the perf improvements that were done to media.

src/Umbraco.Core/ContentExtensions.cs

@@ -60,6 +60,16 @@ namespace Umbraco.Core
 
         #endregion
 
+        internal static bool IsMoving(this IContentBase entity)
+        {
+            // Check if this entity is being moved as a descendant as part of a bulk moving operations.
+            // When this occurs, only Path + Level + UpdateDate are being changed. In this case we can bypass a lot of the below
+            // operations which will make this whole operation go much faster. When moving we don't need to create
+            // new versions, etc... because we cannot roll this operation back anyways. 
+            var isMoving = entity.GetDirtyProperties().All(x => x == nameof(entity.Path) || x == nameof(entity.Level) || x == nameof(entity.UpdateDate));
+            return isMoving;
+        }
+
         /// <summary>
         /// Removes characters that are not valid XML characters from all entity properties
         /// of type string. See: http://stackoverflow.com/a/961504/5018