I was using Steam one day and tried to play Fallout 3. Suddenly, the laptop from then on had extremely poor loading speed with any browser and apparently the speed affected every device connected to the home WiFi router. Usually, the download speed is somewhere between 2~7 Mb in Steam but after Fallout 3, it went to 900~50 Kb (even from browser downloads). Note that my speedtest had around 90 Mb in download but 20 Mb in upload. When I open Chrome it barely loads the pages I normally go to and the issue is impossible to solve whether I try to change the DNS or refresh the router every device is fully affected and more critically the high-end laptop I use! I think I need a professional please.