With my previous experiences updates on older devices always have a negative effect on Apple devices , for example my PowerBook G4 used to run smoothly on OS 9 then installed OS X then everything went downhill, same thing happened with my iPhone 3G on iOS 4, my Mac Mini on OS X 10.7(Lion) , I've also noticed some lag on my iPhone 4 with iOS 5.01 installed , and now the iPad 1 , which shall be soon be dismissed by Apple as they usually do. If I could revert back to 4.3 I would, there are many pointless features on iOS 5 for iPad for example the notifications centre, I find that the notifications centre just gets in the way when your playing games like fruit ninja and uses memory which slows down your device, there are still badges with numbers in a red circle on yours apps so there is no need for notifications centre. The main problem which this forum is largely based is the performance of safari, it is not as snappy and smooth as it was on iOS 4, not to mention the increasing and ongoing problem of crashing which is most annoying when on important sites that require a secure login. Hopefully Apple will fix this in the new 5.01 update but history tells us that they'll probably make it worse.
LIKE THIS If anyone agrees :)