diff --git a/src/policy.cpp b/src/policy.cpp
index 08736e4df..e92addcb4 100755
--- a/src/policy.cpp
+++ b/src/policy.cpp
@@ -1370,7 +1370,8 @@ namespace libtorrent
 #ifndef NDEBUG
 	bool policy::has_connection(const peer_connection* c)
 	{
-		INVARIANT_CHECK;
+// too expensive
+//		INVARIANT_CHECK;
 
 		assert(c);
 		try { assert(c->remote() == c->get_socket()->remote_endpoint()); }
diff --git a/src/session_impl.cpp b/src/session_impl.cpp
index d6b9a0885..f2e2ac806 100755
--- a/src/session_impl.cpp
+++ b/src/session_impl.cpp
@@ -809,7 +809,8 @@ namespace detail
 	{
 		mutex_t::scoped_lock l(m_mutex);
 	
-		INVARIANT_CHECK;
+// too expensive
+//		INVARIANT_CHECK;
 		
 		connection_map::iterator p = m_connections.find(s);
 
@@ -841,7 +842,8 @@ namespace detail
 	{
 		mutex_t::scoped_lock l(m_mutex);
 
-		INVARIANT_CHECK;
+// too expensive
+//		INVARIANT_CHECK;
 
 		assert(p->is_disconnecting());
 		connection_map::iterator i = m_connections.find(p->get_socket());
@@ -2067,7 +2069,8 @@ namespace detail
 	{
 		mutex_t::scoped_lock l(m_mutex);
 
-		INVARIANT_CHECK;
+// too expensive
+//		INVARIANT_CHECK;
 
 		if (m_alerts.pending())
 			return m_alerts.get();