Since a lot of time my Lutris download speed is very slow and evrything else works fine. When it downloads a Lutris runner the connection goes to 1Mbit for Lutris and also any download it does while installing a game. I will do a test in about two hours and come here with the result, going to try downloading with my cellphone which has around 40Mbit speed and is another network. This to discard that it is my ISP.
If Lutris uses any special method to connect please mention it if you know this so I can talk to my guy and see if he can check any special port connection or wtv.