Hi, Jainendra1807,
Thank you for using Couchbase.
Since Couchbase 4.0 brings many new services and components, it’s expected that it will need more CPU. We have a sizing guidelines here: http://developer.couchbase.com/documentation/server/current/install/sizing-general.html
Is that possible that you can try this using 4 core machine?
Thanks,
Qi