Enable or disable the page cache. Disabling the page cache is
generally only useful for special circumstances like low-memory
scenarios or special purpose applications like static HTML
viewers. This setting only controls the Page Cache, this cache
is different than the disk-based or memory-based traditional
resource caches, its point is to make going back and forth
between pages much faster. For details about the different types
of caches and their purposes see: http://webkit.org/blog/427/webkit-page-cache-i-the-basics/