Not trying to sound like a negative ned, but this doesn't explain much. Once again, I had an iPhone 3GS right next to my iPhone 4. Both had 5 full bars of 3G. iPhone 3GS loaded pages in normal time, while the iPhone 4 struggled, taking more than a minute, if it even loaded at all. If it's a network issue, it should be affecting ALL phones, not just the iPhone 4. What's interesting is that at late night, around 1-2AM, I get VERY FAST speeds consistently. But once I wake up, after 8-9AM, the speed drops if it even works at all.
Any by the way, from the looks of it, it seems that 100% of the people in this thread are experiencing this problem. Not a single person has said that their iPhone 4 is giving them "normal" speeds at all times. Just an interesting fact, I thought.
Side note: where in NJ are you located? I live in Central Jersey near Rutgers and I've been experiencing this problem for the past few days.