[tacticalogic]

That's not what I said. What I said was that OS X does a better job of multitasking than does Windows... in other words, it does a better job of sharing the resources and dividing the attention of the CPU and memory without slowing the system. No magic about it. It will be getting even better with Snow Leopard's Grand Central Dispatch, which is designed to better take advantage of multiple core CPUs.

You also said that no matter how many apps you load on it, running or not, it won't be noticably slower.

[Swordmaker]

You also said that no matter how many apps you load on it, running or not, it won't be noticably slower.

That's quite an exaggeration of what I said. Here is the exact quotation of what I said...but I am going to make it more accurate:

"If you've got sufficient RAM, pretty much true. You can slow one down if a lot of them are concurrently processing but just because an apps is are loaded, ready and are resident in memory does not cause slowdowns. OS X Macs multitask better than Windows machines do. The Mac I am posting this on has ten major apps running right now, with several processing, with no appreciable or noticeable slowdown. When I am in a major production mode, it is not unusual for me to have more than 20 going at once on several different virtual screens."

Ask yourself why does a Windows machine often run faster once the Registry has been cleaned up, regardless of what applications have been loaded into RAM to run? A Mac does not have a registry and doesn't need one.