I don't have a 4, I have a 3. But all my blue progress bars load fully in less than 5 seconds. I tried several websites and the longest one was 6.1 secs for Facebook(Facebook for me, always takes the longest to load).
Most sites were less than 3.5 secs to load. Maybe I have a fast router? I dunno but I have never had slow load issues.
Actually, most of the time, if I mis tap, it's faster to let it load and push back button on my browser than to cancel and reload.
My router is at least 7 years old. I haven't upgraded it since it is working fine. My broadband is only 8MB but am considering to upgrade to fiber optic. The comparison is just to show how much faster iPad 4 relative to iPad 3. If you have a better broadband connection, you may not notice the difference. For me, iPad 4 is obviously much faster even without testing.