From b0f4d0e16b7be3638a5471fd5292aca5973cdc2f Mon Sep 17 00:00:00 2001
From: Shannon <sdeminick@gmail.com>
Date: Wed, 21 Jun 2017 18:11:03 +1000
Subject: [PATCH] U4-10046 Stop resolving TreeController from the PluginManager
 for every back office request

---
 src/Umbraco.Web/Editors/BackOfficeController.cs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/Umbraco.Web/Editors/BackOfficeController.cs b/src/Umbraco.Web/Editors/BackOfficeController.cs
index a72b9ac85e..438a9f179c 100644
--- a/src/Umbraco.Web/Editors/BackOfficeController.cs
+++ b/src/Umbraco.Web/Editors/BackOfficeController.cs
@@ -717,11 +717,19 @@ namespace Umbraco.Web.Editors
 
             return app;
         }
-
+
+        /// <summary>
+        /// A lazy reference to all tree controller types
+        /// </summary>
+        /// <remarks>
+        /// We are doing this because if we constantly resolve the tree controller types from the PluginManager it will re-scan and also re-log that
+        /// it's resolving which is unecessary and annoying. 
+        /// </remarks>
+        private static readonly Lazy<IEnumerable<Type>> TreeControllerTypes = new Lazy<IEnumerable<Type>>(() => PluginManager.Current.ResolveAttributedTreeControllers().ToArray());
 
         private IEnumerable<Dictionary<string, string>> GetTreePluginsMetaData()
         {
-            var treeTypes = PluginManager.Current.ResolveAttributedTreeControllers();
+            var treeTypes = TreeControllerTypes.Value;
             //get all plugin trees with their attributes
             var treesWithAttributes = treeTypes.Select(x => new
             {