MozillaZine: [Firefox] Back and Forward Now Blazingly Fast

“The latest nightly builds of Mozilla Firefox include a new
feature that significantly improves the speed of the Back and
Forward buttons. When using Back and Forward in older builds, the
page is retrieved from the local cache rather than the Internet but
Gecko still has to reparse the HTML and use it to rerender the
page, which can take a while with more complex documents. With this
new feature, the rendered page is kept in memory, which makes Back
and Forward performance much faster (almost instantaneous). In
addition, going back or forward to a page cached in this way shows
the page exactly how it was when you left it, in compliance with
section 13.13 of RFC 2616…”

Complete
Story