I Just got the Mobile-first Index notice on my Search Console about two weeks ago. A little before then, I started to see big changes (to the negative) in my keyword rankings. They have gotten even worse as of today.
Has anyone else seen a big drop in rankings after Mobile First, and then a recovery? This is very strange. I have a responsive site, the only difference between desktop and mobile is the menu on desktop is hidden in mobile, and a hamburger menu (not on desktop) shows up for mobile.
The only other thing I can think of is speed is more critical in mobile than desktop, so maybe my desktop rankings are lowered by worse speed ratings in mobile.
Anybody have any insight in this, or suggestions?
Was there a major Algorithm change in the last 3 weeks that may have caused this?