Speed up sqlite3 initialization by disabling unused features.

src/NzbDrone.Core/Datastore/DbFactory.cs

@@ -27,10 +27,20 @@ namespace NzbDrone.Core.Datastore
 
         static DbFactory()
         {
+            InitializeEnvironment();
+
             MapRepository.Instance.ReflectionStrategy = new SimpleReflectionStrategy();
             TableMapping.Map();
         }
 
+        private static void InitializeEnvironment()
+        {
+            // Speed up sqlite3 initialization since we don't use the config file and can't rely on preloading.
+            Environment.SetEnvironmentVariable("No_Expand", "true");
+            Environment.SetEnvironmentVariable("No_SQLiteXmlConfigFile", "true");
+            Environment.SetEnvironmentVariable("No_PreLoadSQLite", "true");
+        }
+
         public static void RegisterDatabase(IContainer container)
         {
             var mainDb = new MainDatabase(container.Resolve<IDbFactory>().Create());