Only set accessibility once per message, not per delivery. Would be great to set it once per proxy creation though

platform/util/src/com/intellij/util/messages/impl/Message.java

@@ -31,6 +31,7 @@ public final class Message {
 
   public Message(@NotNull Topic topic, @NotNull Method listenerMethod, Object[] args) {
     myTopic = topic;
+    listenerMethod.setAccessible(true);
     myListenerMethod = listenerMethod;
     myArgs = args;
   }

platform/util/src/com/intellij/util/messages/impl/MessageBusConnectionImpl.java

@@ -102,8 +102,6 @@ public class MessageBusConnectionImpl implements MessageBusConnection {
 
     try {
       Method listenerMethod = message.getListenerMethod();
-      // Method.invoke must be faster when Method.override is set to true
-      listenerMethod.setAccessible(true);
 
       if (handler == myDefaultHandler) {
         myDefaultHandler.handle(listenerMethod, message.getArgs());