Lots of generated queries
Problem was in theme. I change to the site Bartik theme and the problem was gone. 

I'm using the commerce kickstart distribution if that helps someone. I run into other issues in the past with the frontpage in this distribution. I just remember that and that is why I thought it could be a problem related to the theme. The theme of this distribution has some lines in the preprocess file and that imho may be the source of the problem.

I my situation I will use other theme since I don't need a responsive theme at all.