It could be the cookie banner appearing.
It is, the content loads first, then the js for the cookie banner, then the favicon. If the js fails to load (I blocked the request as a test) the page loads just fine, it isn't blocked by that.
It is, the content loads first, then the js for the cookie banner, then the favicon. If the js fails to load (I blocked the request as a test) the page loads just fine, it isn't blocked by that.