To crosscheck this I used 'terminal emulator' to ping any website, what is see is that, always for resolving the domain dame it take 15-20 second time, then ping continues normal, similarly when I use any website IP to pinged there is no such issue.
Interestingly I found that sometimes when I connect to wifi then restart the phone, after that all browsing works fine and fast, but as soon as I change WiFi to another connection or turn wifi off-on, then again problem start to appear.
I have checked with few other phone connected to same WiFi connection, those are not at all having any such issue.
Can any one please tell any solution to this??
Android version is 4.2.2,
WiFi connection (which I am using) speed is more than 10mbps.