I have the 9650 and it just took me 20 seconds to load www.yahoo.com.  10 seconds for initial page load, and another 10 seconds to load all the images.

Amount of RAM should have no impact on load speed. Data network congestion is the biggest factor.  Also, browsing on a Blackberry is typically not direct to a website.  A Blackberry server sits in the middle, gets the data for the desired web page, and then reformats and compresses the data to then send to your device.