diff --git a/lib/x11/xcore.js b/lib/x11/xcore.js
index 062efe2..e7c383e 100644
--- a/lib/x11/xcore.js
+++ b/lib/x11/xcore.js
@@ -100,11 +100,14 @@ XClient.prototype.importRequestsFromTemplates = function(target, reqs)
             else
                client.seq_num++;
 
-            // long stack traces. going to disable in next commit, keep it currently to compare performance
+            // disable long stack trace for the moment, it's too expensive
+            // performance when enabled: 70000 requests finished in 52196 ms, 1341.0989347842747 req/sec
+            /*
             var err = new Error;
             err.name = reqName;
             Error.captureStackTrace(err, arguments.callee);
             client.seq2stack[client.seq_num] = err.stack;
+            */
 
             // is it fast?
             var args = Array.prototype.slice.call(req_proxy.arguments);