He is playing on PCSX2 which is an emulator. Try watching his SSX3 runs, the quality is awesome. I have the emulator myself and the graphics are so good I bought a USB Playstation 2 controller adapter so I could play it properly. You need a seriously high spec computer to even run SSX3 though let alone get smooth results. I have an i7 Quad core at 3.2Ghz with a Nvidia GTX 295 dual GPU graphics card, 6GB DDR3 ram and I still got the occasional lag.
Looks like his system can't handle it atm, seems to be a big slower than it should be.