A solution is Reset Safari from its menu and reset everything. If there is delay before pages load, perhaps Safari isn’t looking for them efficiently.
Go to the Network page of System Preferences, click your internet connection (Ethernet or AirPort), then click on Advanced, and go to the DNS tab. Under DNS Servers, you’ll see nothing or the IP address of your router, greyed out.
This leaves Mac OS X to find a default DNS (domain name server) that translates the web addresses typed into the actual IP addresses where sites are hosted. Pointing it to a specific DNS could speed things up.