I am very good at optimizing windows XP,Vista/7,... This is what I do:
I run the free tool > CCLEANER (removes browser crap, etc...)
I disable the "themes" and other services
I optimize for "best performance" by right clicking on "my computer" and > avanced
I run Registry Mechanic
I run Spyware Doctor to completely remove cookies, spyware, viruses, etc..
I run MSCONFIG and disable startup programs and disable some services from there as well
Computers run MUCH faster after i perform the above optimization steps on Windows.
However, I would like to know how to perform the equivalent on Mac OS X.
Please provide recommendations on software tools, and steps to do a complete optimization like the above.