I finally found out how to speed up Safari in Mountain Lion. Apparently, Safari prefetches the links before displaying the page. I used namebench utility from Google: https://code.google.com/p/namebench/. It searched and tested over 4,000 DNS addresses. The results is a report with the addresses of the top 3 DNS addresses you should use. Just open Network Preferences/Advanced and add (+) the three addresses in the same order. Speedy browsing to you..