Go to the terminal
Not really much of a hack. I do a lot of digital photogrpahy and some people work with video a lot. And if your hard drive is getting close to full you will experience a slow down. There is a need to optimize the hard drive. Mac OS X (BSD) actually has this capability.
Comments on this hack
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There are already there...
This is not a hack, instead it is totally misleading
update_prebinding is a library optimization