Optimising Macs

[Dark Servant]

I've got a handy little donationware program called Cocktail that 
apparently optimises settings for OS X to make things run more 
efficiently. I does things like Repair Permissions and re-prebind 
system. It also has this thing about cron scripts (one for each day, 
each week and each month).
What do the cron scripts actually do? Is using this program going to 
make things more efficient?
Things seem smoother and faster after performing the tasks stated above 
but maybe that's just my perception.
Hope there's someone that knows a little more about this stuff than me.
Ruben A. Franke