I noticed in the last week or so that practically all of my clients have had sudden boosts.
Checking the SERPS flux monitors reveals the weather has been hot recently :
http://serpmetrics.com/flux/
http://mozcast.com/
Is it Penguin 4 testing ?
https://www.seroundtable.com/google-testing-the-new-penguin-algorithm-21892.html
Anyone else noticed change ?