Also, strangely when I try my site for various Page speed checkers like google page speed tool, I get better results in few tests when the memcached (even any use_cache) is disabled in comparison of when it is selected. (Other parameters like CCC for JS, css etc are enabled in both cases).
That means I am not getting desired result with Memcached enabled (IP address I am giving on 'Add server' is localhost, should it be changed with external IP of my server), Can you Please suggest.
Thanks,