iPhone4 iOS 4.3 Update-FolderIcon Lag Video

Hi there,
I have just updated from iOS 4.1 on my iPhone4 to the new 4.3
Everything is good so far but one thing has stood out. The time it takes for folders and icons to become ready to be moved, I.e. jiggling about.
On 4.1 it was pretty much instantaneous, but now it takes around 1 - 1.5 seconds extra which for me is making the iPhone lose its fluidity.
Is this a problem with my phone? Or is it a iOS wide issue?
Video link to my iPhone:
http://www.youtube.com/watch?v=vzSddUXQZug
Any help is really appreciated,
R
iPhone 4 iOS 4.3 iOS 4 24" iMac 3.06GHz Core Duo 2GB Ram OSX 10.5