Waterfall view - gap between asset requests

I am trying to increase the page load speed on our mobile web site. Yesterday I came to the conclusion that the page speed is affected by the number of requests we make to get assets and some images, so I quickly fixed it with half of lazy loading.

While I see a slight performance improvement, I assumed that if I was lazy loading some images, the DOMContentLoaded would happen early in the waterfall and the graph would be more compact.

Yesterday the waterfall looked like this:

Today all images medium_*

are after page load (red bar):

Now, what bothers me is why is there such a large gap between the arrow_right_white

and google_analytics

script (somewhere between 0.5s and 1s)? Is something happening at the time? I don't see anything extraordinary in the profile.

Link example: https://www.autouncle.de/de/gebrauchtwagen/67165104-renault-kangoo-ze-2-sitzer-klima