diff --git a/ChangeLog b/ChangeLog
index f2a4f40e7..1808501b8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Thu Nov 26 13:35:00 1998  Richard Frith-Macdonald <richard@brainstorm.co.uk>
+
+	* src/NSObject.m: ([+instanceRespondToSelector:]) and
+	([-respondsToSelector:]) changed to use __objc_responds_to() for an
+	order of magnitude performance boost.
+
 Thu Nov 26 11:00:00 1998  Richard Frith-Macdonald <richard@brainstorm.co.uk>
 
 	* src/NSRunLoop.m: Bugfix in ([-addEvent:type:watcher:forMode:]) to get
diff --git a/Source/NSObject.m b/Source/NSObject.m
index c91e53bc3..b9a89578e 100644
--- a/Source/NSObject.m
+++ b/Source/NSObject.m
@@ -443,7 +443,11 @@ static BOOL double_release_check_enabled = NO;
 
 + (BOOL) instancesRespondToSelector: (SEL)aSelector
 {
+#if 0
   return (class_get_instance_method(self, aSelector) != METHOD_NULL);
+#else
+  return __objc_responds_to(self, aSelector);
+#endif
 }
 
 + (BOOL) conformsToProtocol: (Protocol*)aProtocol
@@ -774,10 +778,14 @@ static BOOL double_release_check_enabled = NO;
 
 - (BOOL) respondsToSelector: (SEL)aSelector
 {
+#if 0
   if (fastIsInstance(self))
     return (class_get_instance_method(fastClass(self), aSelector)!=METHOD_NULL);
   else
     return (class_get_class_method(fastClass(self), aSelector)!=METHOD_NULL);
+#else
+  return __objc_responds_to(fastClass(self), aSelector);
+#endif
 }
 
 - retain