IOS 4.2.1 have performance problem?

I use iOS 4.2.1 on iPhone 4. While many background applications run, my iPhone4 is very slowly. I think iOS4.2.1 have performance problem. So, Apple should release maintenance release for iOS 4.2.
Do you think?

Yes, I do not try it but I guess so. If I stop background applications, I can get confirmable iPhone life.
According to apple, "task manager" must be unnecessary for iPhone. Memory control for iOS4.2 have is not good.
Message was edited by: hiro.qli

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