German internet infrastructure drives me crazy when I visit. I live in Sweden and broadband here is really good, both mobile and land-based ones, whenever I go to a major German city (München, Berlin, Frankfurt, Hamburg) I suffer with 4G, I suffer with my friends' or offices' internet connection. It's not even the slowness that bothers me more, it's the spottiness: 4G signals dropping to 3G and depending on the area even to 2G (haven't seen this happen the last time I visited in 2019 but definitely saw it before).
Home broadband have issues that the operator can't solve quickly (once working from home at a friend's place we got the house apartment internet cut off for a couple of days), Telekom sucks, their customer support sucks, sending a technician can take a month or more sometimes.
It feels so damn backwards, even more for the largest economy in the EU, not investing in digitalisation (both infrastructure and public services) is gonna bite Germany's ass for the next decade. Can't believe most bureaucracy is still done through paper-based mail, or faxes.