I just went to those three sites that you mentioned and experienced no lag. If i were you, i would restart my phone and see if you can then duplicate the issue.

I am running the stock browser...just fyi.

 

At my be an app that is giving you this problem.

 

I have had lag too...i second this

 

yes, definitely doesn't scroll large websites smoothly like it did before. seems jerky, like its animating with half the frames.

 

i just tested it out, im not really get any lag at all. I only noticed a lil bit of lag when i got to the top of the page(ign.com) when it had Best of 2009 menu scrolling through the different stories(flash menu i guess whatever you call it). But after i scrolled past it, it was really smooth.