See this is exactly why I don't want an android phone. Look at the browser lag. I know the iPhone doesn't do this. It's smooth.
http://www.youtube.com/watch?v=JBJT_n6u7Wk&feature=player_embedded#at=11
I hope you realize that Android browser reformats the text when you pinch to zoom on a webpage. They reformat the text so you don't have scroll left and right to read the whole page. It's not lag at all.
iPhone, on the other end, merely enlarges the text. You have to scroll left/right to read the page.
The browsing on the Sensation is better than on my iPad. It's populated by checkerboard.