In my experience a lot of the waiting time is the speed of the phone itself. For example, have you tried using a PC tethered to your N95 to see if that loads just as slowly over the same connection?

That said, its not that unusual to have really poor ping times over the mobile network and there is nothing you can do about it. When you trying to share a data connection over such a wide area and long distances, you introduce lag. You have to remember your signal could be bouncing around between buildings, passing through trees and be shared with who knows how many people in the area.

Overall though, I would be amazed if you did not see a huge speed increase in web browsing simply because of the massive boost in processing speed in the N900 including the graphics acceleration which means it takes less effort to draw those pages to the screen.