Index: ps/trunk/build/premake/premake5.lua
===================================================================
--- ps/trunk/build/premake/premake5.lua
+++ ps/trunk/build/premake/premake5.lua
@@ -539,9 +539,11 @@
 		table.insert(static_lib_names, project_name)
 	end
 
-	if os.istarget("windows") then
-		rtti "off"
-	elseif os.istarget("macosx") and _OPTIONS["macosx-version-min"] then
+	-- Deactivate Run Time Type Information. Performance of dynamic_cast is very poor.
+	-- The exception to this principle is Atlas UI, which is not a static library.
+	rtti "off"
+
+	if os.istarget("macosx") and _OPTIONS["macosx-version-min"] then
 		xcodebuildsettings { MACOSX_DEPLOYMENT_TARGET = _OPTIONS["macosx-version-min"] }
 	end
 end
@@ -564,7 +566,6 @@
 	end
 
 	if os.istarget("windows") then
-		rtti "off"
 		links { "delayimp" }
 	elseif os.istarget("macosx") and _OPTIONS["macosx-version-min"] then
 		xcodebuildsettings { MACOSX_DEPLOYMENT_TARGET = _OPTIONS["macosx-version-min"] }
@@ -985,6 +986,8 @@
 
 	dependson { "Collada" }
 
+	rtti "off"
+
 	-- Platform Specifics
 	if os.istarget("windows") then
 
@@ -992,8 +995,6 @@
 		-- from "lowlevel" static lib; must be added here to be linked in
 		files { source_root.."lib/sysdep/os/win/error_dialog.rc" }
 
-		rtti "off"
-
 		linkoptions {
 			-- wraps main thread in a __try block(see wseh.cpp). replace with mainCRTStartup if that's undesired.
 			"/ENTRY:wseh_EntryPoint",
@@ -1387,6 +1388,8 @@
 
 	dependson { "Collada" }
 
+	rtti "off"
+
 	-- TODO: should fix the duplication between this OS-specific linking
 	-- code, and the similar version in setup_main_exe
 
@@ -1394,8 +1397,6 @@
 		-- from "lowlevel" static lib; must be added here to be linked in
 		files { source_root.."lib/sysdep/os/win/error_dialog.rc" }
 
-		rtti "off"
-
 		-- see wstartup.h
 		linkoptions { "/INCLUDE:_wstartup_InitAndRegisterShutdown" }
 		-- Enables console for the TEST project on Windows