Actually, at ~7Mbps download, you aren't going to notice any difference in web page loading (unless you're going to something with a RIDICULOUS amount of video/graphics) compared to ~13Mbps . I would think that it's a browser difference.
Not to say that the wireless overall isn't lacking compared to other devices... but how much of an effect that actually has on something like web browsing is pretty slim (at least at the speeds you're talking about).
when I compared 720p review flash videos from gsmarena.com on both my prime and GSII I can see that they stutter a bit on the Prime while they play fine on my phone... so it may be a browser or maybe wifi or both... lets hope ICS will bring fixes to those issues. I'm not complaining about browser performance in general but there is a noticeable lag.... not mention it FCs from time to time