Mac 68k web browsers (Explorer and Netscape) usually suck. They are usually far slower than AmigaOS ones (and don't support CSS anyway).
I would try out iCab if I wanted to run a MacOS 68k web browser...
Anyway the fun of using an Amiga is using AmigaOS software.
BTW, MacOS 8 is slower than 7.5.x and doesn't offer much more... it's a waste of cpu and memory. MacOS 7.5.x works much better (060s included).