About source of John Muller :

“I think it’s a lot trickier when it comes to things around quality in general where assessing the overall quality and relevance of a website is not very easy.

It takes a lot of time for us to understand how a website fits in with regards to the rest of the Internet.

And that means on the one hand it takes a lot of time for us to recognize that maybe something is not as good as we thought it was.

Similarly, it takes a lot of time for us to learn the opposite again.

And that’s something that can easily take, I don’t know, a couple of months, a half a year, sometimes even longer than a half a year, for us to recognize significant changes in the site’s overall quality.

Because we essentially watch out for …how does this website fit in with the context of the overall web and that just takes a lot of time.

So that’s something where I would say, compared to technical issues, it takes a lot longer for things to be refreshed in that regard.”

In resume be patient ; create a good website is not a sprint is a marathon.