LayoutCache allows you to move the cache from /tmp
to another directory. This is commonly used either when you
can dedicate a disk to being a cache or when you
have created a ramdisk to use as a cache (which is a good
idea for Linux if you are in a heavy demand situation).
This was added in version 2.7.4.
<VirtualHost www.foo.com:80>
LayoutCache /ramdisk
</VirtualHost>