4.2.1's lag issue on iPhone 4

Hi there,
I just update to iOS 4.2.1 few days ago, well, the new features were just work fine, but I found a lag problem with my iPhone4, yes, it was LAG!
here are some cases：
1. lag when scrolling（such as in address book or other pages with long contents)
2. lag when opening a folder or closing a folder
3. pressing HOME, the zoom out animation sometimes lag
4. pressing APPs, the zoom in animation maybe lag
5. double pressing HOME, the animation maybe lag,,,,
the issue seems just like a computer in high CPU usage or with low memory, and sometimes it made me a little bit freak out....
after I cleared all the histories and cookies and caches and closed all background APPs, the issue remained,,,
there was no problem when my iPhone 4 was iOS 4.1 and previous versions.
and my iOS 4.2.1 works fine inside the APPs,,,
I wonder if any other users got such lag issue, or it was just something wrong with my iPhone,,,,
please help me, thanks!

Yet another troll tactic to tell anyone refuting their undocumented claims to leave the thread. You have no say who posts here, and i have no interest whether you respond.
I follow the 4.3 beta Dev forums and this is not a topic being discussed there. Instead of vague, claims about what anonymous "colleagues" said, why don't you post the Apple bug report number, attached to all bugs under investigation.
While you're at it, why don't you post a link to another significant thread in this or any other forum on the topic, instead of lame, a-h remarks.
Message was edited by: modular747

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Bob:
I've stated the Network Printer did not apply to me,
thanks a lot still.
ID.Awe
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