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I changed my Drupal theme to "Bootstrap 3" and now my traffic is down 50% gradually in past 5 days, can this be theme related? Answers to checks below : 1). There were no redirects involved, I just flipped a switch and changed theme for my Drupal blog. 2). No issues reported by Google WMT except the fact that impressions fell, see stat images for comparison at - http://imgur.com/a/5PssH#0. 3). site:mysiteurl.com shows healthy "About 201,000 results". 4). Checked slow loading times and browser issue, nothing there. 5). It's not a seasonal drop. Pls. suggest what else should I focus upon to find the reason. @Prateek_Chandra where can I share my analytic report with you privately. I can also enable guest access to my account for you to have a look.