How to defrag my macbook ?

I normally do "defragment" in my PC. But how can I do "defragment" in my Macbook?

I'm considering a back-to-back cloning of my hard drive to "defrag" it. Should I erase the target volume first and then clone? I use Carbon Copy Cloner and it warns me that it will erase everything on my target volume first. Does this accomplish erasing the target volume as you suggest?
My TiBook is 4 years old, the hard drive is 80% full, and I get an awful lot of spinning beach balls and hanging apps. For instance, Firefox takes up to 27 seconds to open, and the same to close. The entire system is running v e r r y s l o w l y.
But it runs noticeably faster on my bootable clone external hard drive, which I believe has the same 5400 rpm speed as my internal drive (connected with a Firewire 400 cable). I was told that cloning the TiBook hard drive from the bootable clone will effectively accomplish a reinstall of the OS.

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