I have found a site called dreamcast emulation which has multiple convrets of mods for Quake1 - Quake 3, this means they can convert Bid for Power or Urban Terror for Dreamcast console. I downloaded Simpsons Quake for DC and it works, you need no mod chip or nothing, just simply run the game. This is awesome, I bet they could convert Counter Strike for HL. These arent addons for the original game either, they get CD-R's then burn the game into .BIN format, then play it on DC. I have been playing Simpsons Quake all day on DC its fun. So there are ways to play games you like without lag, this is definetly awesome..

BTW - i downloaded the tutorial and im gonna burn Serious Sam to CD-R for Dreamcast. :-D