This still has a few issues, but I've made very good progress towards getting Skia working on PPC, which results in much faster browser compositing compared to the CoreGraphics backend. For comparison, the cross dissolve on the main image of https://powerfox.jazzzny.me/ finishes around twice as fast! Hopefully this will be functional on 10.4 too, but it seems like the next release is shaping up to be a very nice one.