Removing forced sleep between message handling. Can cause excess delays if handle_messages handles only one message and there are multiple messages waiting / piling up independent of handle frequency.

guacd/src/client.c

@@ -135,7 +135,8 @@ void* __guac_client_output_thread(void* data) {
 
             }
 
-            /* Sleep before handling more messages */
+            /* Do not spin while waiting for old sync */
+            else
                 __guacd_sleep(GUAC_SERVER_MESSAGE_HANDLE_FREQUENCY);
 
         }