feat(Core/Config): Add parameter to load all grids of all non-instanced maps on server start (#2283)

src/server/worldserver/worldserver.conf.dist

@@ -203,15 +203,6 @@ SaveRespawnTimeImmediately = 1
 
 MaxOverspeedPings = 2
 
-#
-#    GridUnload
-#        Description: Unload grids to save memory. Can be disabled if enough memory is available
-#                     to speed up moving players to new grids.
-#        Default:     1 - (enable, Unload grids)
-#                     0 - (disable, Do not unload grids)
-
-GridUnload = 1
-
 #
 #    CloseIdleConnections
 #        Description: Automatically close idle connections.
@@ -246,13 +237,6 @@ SocketTimeOutTimeActive = 60000
 
 SessionAddDelay = 10000
 
-#
-#    GridCleanUpDelay
-#        Description: Time (in milliseconds) grid clean up delay.
-#        Default:     300000 - (5 minutes)
-
-GridCleanUpDelay = 300000
-
 #
 #    MapUpdateInterval
 #        Description: Time (milliseconds) for map update interval.
@@ -416,6 +400,18 @@ CleanCharacterDB = 0
 
 PersistentCharacterCleanFlags = 0
 
+#
+#    PreloadAllNonInstancedMapGrids
+#        Description: Preload all grids on all non-instanced maps. This will take a great amount
+#                     of additional RAM (ca. 9 GB) and causes the server to take longer to start,
+#                     but can increase performance if used on a server with a high amount of players.
+#                     It will also activate all creatures which are set active (e.g. the Fel Reavers
+#                     in Hellfire Peninsula) on server start.
+#        Default:     0 - (Disabled)
+#                     1 - (Enabled)
+
+PreloadAllNonInstancedMapGrids = 0
+
 #
 ###################################################################################################