Defrag fo the IMAC?

Is there a defrag for the IMac? Or any thing like it for the IMac?

the operating system does it for you ! so not really.

if you want u can empty the junk etc out of the system by using onyx

http://www.titanium.free.fr/pgs/english.html

apart from that the computer takes care of it for you.

Yup, what I have read is that Macs pretty much defrag at the file level on the fly. They do not scatter pieces of a file all over - instead, each file is usually rewritten to a fully consecutive set of blocks. Hence, individual files are pretty much never fragmented.

This works well until your disk is nearly at capacity, at which point, OS X may need to start going block by block. However, at this point, fragmentation of an individual file is the least of your worries - you need more disk, or free up of existing space, anyway.

Thanks..

That's Apple rhetoric. Run any defrag program weekly and you'll see hundreds of fragged files, even if your drive is 90% free.
I suggest Disk Defrag by SpeedTools.

Whenever my system is running too slow and the HD is to blame, I do a defrag and it helps a lot. Like when I launch a program and I hear excessive HD access... sounds like it's brewing coffee...

1) Quit every program
2) Kill processes you don't need open
3) Run defrag
4) Restart
5) Enjoy