I am a new Mac user after many years on Windows computers. I started out pretty cheap by buying a G4 Sawtooth running at 500 megahertz with 512 megs of memory. I notice that the machine has lots of trouble playing any type of video on the Internet. The machine is pretty old but I thought that it at least would be able to handle YouTube videos pretty smoothly. Is there any way to speed up the machine so that it can render videos a lot better?