Wombat2go: I've borrowed the router and the person who owns it is out of the country for few months
The IP doesn't lead to any login page, so it must be something else.
aleonx3: There are currently 2 devices connected to the router - before, I topped 3 when I had the switch, all using internet.
I don't feel like it's the actual speed being the cause of the issue, but rather the amount of connections causing things to go slower.
Besides that, my speed really shouldn't (and never was with the switch) be a problem:
Banskojoe: Thanks for the suggestion - I tried googling it to find local sellers, but can't find a single one in the entire country