does safari lag while ur on wifi? or is it just when ur connected to cellular data network (3G)?
you may find that "words with friends" and "facebook" could be causing issues because they use push notification. Try turning push off in settings. I had some apps using push and I found it drained my battery big time, but this could be causing 3G lag too???
Both.
A good example is that i'm browsing a page, and I open my bookmarks. I click on a bookmark, and nothing happens. So I try again. Nothing. I try another, nothing. I try the home button, nothing. After about 10 seconds it catches up.