I have found what I feel is a great solution for people with slower G4's or people that just want the site to stop hogging all their CPU. I recently discovered a great free app called "Mactubes" and have quickly fallen in love with it. Using this on my G4 1.8GHz I have watched video of all different quality/resolution and the CPU consumption ranges from 17-36%. The even better thing is that you can watch, search and download every video on youtube without ever going to the website. Gives you a great player window also that makes it much more like watching vids in VLC or something. These results I speak of require one specific setting in the apps preferences.. 1. Download Mactubes here. It supports 10.4.2+ 2. Launch it then open preferences. Set the player type to Quicktime like the image I have attached shows. The window mentions near the bottom you need Safari 4+ but that is only for the "Video player" mode which uses html5 but without actually launching Safari. QT player setting uses even less CPU. I have also tried the flash and video player setting and they use more CPU. The quicktime interface takes flash out of the equasion all together which is amazing. Virtually every video on youtube is a lowres h.264 with a flash (.flv) wrapper. The QT setting ignores the wrapper and plays the h.264. Even a G4 400+ can play low res h.264 without the flash crap. Please share your results if you try this.