Update: I disabled Google Adsense on most of the pages and the cookies and redirects disappeared on these pages. I had a look at the Google cookie policy and the cookies, which I found, are not documented there.
Disabling Adsense, I see in Gtmetrix a reduced load time, e reduced page size and an improved page speed score.
I’m quite convinced that the cookies and redirects I found are not GDPR compliant and I’m wondering, whether there is a way to control them. Actually, Adsense seems to be completely out of control, setting cookies here and redirects there, slowing down the site about 50%.
How can I keep this under control?