so I live in a building that has a lot of people and some of them are no lifers meaning that they found the password for my WiFi in a day I know this because my internet is so slow and its supposed to be very fast there's at least 4 people using my WiFi and its secured using WPA2-PSK. I'm tired of changing the password every other day so I don't want to change it i want to make the WiFi so slow to the other people that they'll have to stop using it and get their own, I use my WiFi to play xbox live, get on my computer and on my phone and that's it. So how can I make my internet slower to other people using it without interfering with my xbox, computer and phone connection. I have a Cisco router and a i think a Surfboard modem and I have Cox communications. I really don't know who the people that are taking my WiFi are or what number they live at but I change the password and then the first few hours the internet is working really fast but then it starts slowing down and I start to lag.