Improve login time by using readahead for computers with enough ram

Registered by Jeff Fortin Tam

http://ubuntuforums.org/showthread.php?t=565651
On all my machines (768 MB of RAM and 1024 MB of RAM), I was able to *easily* cut down my login time from 40 seconds to 20. I suggest that some form of readahead is hooked up into the gnome login by default in ubuntu, using only the most commonly preloaded stuff (ex: nautilus, the gnome libraries, the window managers, etc).

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