I did what you suggested and reduced (1) the number of running services to a minimum and (2) the networks traefik is a member of to a minmum. It didn't change a thing. Then I opened a private browser window and saw much faster loading times. Great. I then set everything back and refreshed the private browser window: still fast. Okay. Guess it's not Traefik after all. The final nail in the coffin for my theory: I uses two traefik instances. Homepage still loads its widgets left to right, top to bottom (the order from the yaml file). The order doesn't correspond to the instances, it's more or less random. So I'm assuming the slowdown has something to do with (a) either caching from traefik or (b) the way Homepage handels the API request: http://IP:PORT (fast) or https://subdomain.domain.de. Anyway, thanks for your help!