3.1 turned my iPhone slow - unusable and lacking in all tasks

Can i downgrade... or should i wait for an update from Apple? Others having same problem?
The iPhone is not unlocked or jailbroken.

I have the same problem. I upgraded to the 3.1 OS from 3.0.1. My iPhone 3G is not unlocked or jailbroken. After the update, the phone's functionality slowed severely. Pressing the home button, side scrolling to other home screens, placing calls, and internet connectivity all were severely slowed down.
I have iTunes 9.0 installed on a Mac Mini with Snow Leopard 10.6.1
I then, restored the phone using the iPhone restore option and then restored using last saved backup. No improvement.
I then decided to restore to full factory settings again and setup the phone as new. Some improvement noted, but the as soon as I started installing apps again the slow response in all the aspects above, returned.
I have one of the (recently removed) free memory apps, MemoryInfo, and it seems the phone on its idle state is using above 95% of the total memory. I did also notice severe battery usage, after just 2hrs of idling the phone the battery drained to 65%.
Apple Engineers - If you do read this, please issue a patch for OS 3.1 or allow us to downgrade to OS 3.0.1 until this problem is resolved.
Thank you.

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