Index: /trunk/src/VBox/VMM/VMMR3/EM.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR3/EM.cpp	(revision 72659)
+++ /trunk/src/VBox/VMM/VMMR3/EM.cpp	(revision 72660)
@@ -174,5 +174,5 @@
     /** @todo change the default to true here */
     bool fExitOptimizationEnabledR0PreemptDisabled = true;
-    rc = CFGMR3QueryBoolDef(pCfgEM, "ExitOptimizationEnabledR0PreemptDisabled", &fExitOptimizationEnabledR0PreemptDisabled, true);
+    rc = CFGMR3QueryBoolDef(pCfgEM, "ExitOptimizationEnabledR0PreemptDisabled", &fExitOptimizationEnabledR0PreemptDisabled, false);
     AssertLogRelRCReturn(rc, rc);
     fExitOptimizationEnabledR0PreemptDisabled &= fExitOptimizationEnabledR0;