Many sites were hit hard in terms of search engine page ranking when Google introduced their major algorithm changes in 2011 and 2012. Since then, both Panda and penguin have undergone a number of updates and with each update, many sites have experienced a deterioration in their search engine positioning.
Google’s Matt Cutts did imply there was a bit of delay in pushing out their monthly Panda refresh because they wanted to release signals that would soften the algorithm a bit.
Google telling that they are unlikely to confirm future panda updates. A wide number of SEOs and webmasters claiming recovery.
In real terms, it will mean that on-page SEO needs to be on point at all times. Sites should be checked regularly for duplicate content and on page tactics will need to be altered and tweaked more often.Social tagging: Google Panda Update > Panda Update