I have had 4.1GM installed since Saturday and I can vouch that there is a significant improvement over 4.0.
General overall performance is significantly better including apps loading faster and no lag when unlocking phone and only the odd lag when typing text messages and emails however overall, text and email apps are running better and opening/loading faster. Safari is still slow although a bit better than in 4.0.
However I can see that in a couple of weeks, once i'm used to the new speed, it will seem quite slow... *sigh*
General overall performance is significantly better including apps loading faster and no lag when unlocking phone and only the odd lag when typing text messages and emails however overall, text and email apps are running better and opening/loading faster. Safari is still slow although a bit better than in 4.0.
However I can see that in a couple of weeks, once i'm used to the new speed, it will seem quite slow... *sigh*