By default Ibrowse uses it's internal 68K image loaders and those are
far from optimal. Set it to use external loaders (Datatypes)
there are also other options on ibrowse that help a lot (load images
to Fast ram and ignore Free-chip), but it's still 68K code and
noticeable slower than Voyager on same page.
For Disk speed. check that Ide DMA is on. Many distros defalt to
CPU data move and that slows down system.
http://somequicknotes.blogspot.com/index.html