It may not be using the processor but it is still using the memory That is what a task killer is designed for, pulling aps out of the memory so it is available for other apps
Android does that automatically....Task Killer is Not needed.
I though so as well but I just don't see it in my phones. What I do see is slow performance when free memory is around 48 mb on my d2 and fast performance when it is over 100 mb
on my D1 it was slow if the free memory was under 40 mb
Breakfast/Lunch: just because Lunch comes after Breakfast every day does not mean that Breakfast causes Lunch!
There is an app, or combination of apps, that is making your phone run slow. When you use your task killer, you are killing it(them). That is what is making your phone speed up.
Relatively soon after you free your memory up to have 100 free, android loads apps back into it and it does not stay at 100 free.
Find the app(s) that are causing the conflicts and your phone will stop slowing down. The Task Killer is like putting a band-aid on a flea bit without getting rid of the fleas!!