Don't have a PPC so I cannot comment. The OS4 version is a different codebase. Possibly more optimised and more importantly still maintained. http://strohmayer.org/owb/
It is much easier / faster on 060 OS3.x if you have another computer (such as a PC or Mac) on your network to open a web-browser on that platform and display/ctrl the window on the Amiga screen (Using VNC or Remote desktop) and save anything downloaded to an Amiga networked drive.
It feels like a native web-browser but 100% compliant and usually faster.