Locate is a great unix/linux util that you can use for fast file searching.
enable locate (search command database) this takes 10 minutes the first ime. But it is a background process.
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.locate.plist
Updatedb (search db)
sudo /usr/libexec/locate.updatedb
find a specific file
locate file