Index: src/script/api/script_list.cpp
===================================================================
--- src/script/api/script_list.cpp	(revision 27593)
+++ src/script/api/script_list.cpp	(working copy)
@@ -11,6 +11,7 @@
 
 #include "../../stdafx.h"
 #include "script_list.hpp"
+#include "script_controller.hpp"
 #include "../../debug.h"
 #include "../../script/squirrel.hpp"
 
@@ -905,6 +906,14 @@
 			}
 		}
 
+		if (ScriptController::GetOpsTillSuspend() < -1000000) {
+			/* See below for explanation. The extra pop is the return value. */
+			sq_pop(vm, nparam + 4);
+
+			ScriptObject::SetAllowDoCommand(backup_allow);
+			return sq_throwerror(vm, "Excessive CPU usage");
+		}
+
 		/* Was something changed? */
 		if (previous_modification_count != this->modifications) {
 			/* See below for explanation. The extra pop is the return value. */