Lots of people are seeing Safari page loads that are slow or stall; this can be intermittent. Many cures have been suggested, many of which seem to work, at least for a while. So many things could be up. I can only report what worked for me (meaning so far, in turn meaning 24 hours -- but the most persistent fix of all).
I looked at the logs in Console.app and saw vast numbers of the the following report:
4/8/14 9:05:57.722 PM acwebsecagent[327]: Connection : Auth key is not provided or is invalid, applying connection failure policy. CMode : 2 TMode : 1
4/8/14 9:05:57.722 PM acwebsecagent[327]: OnConnectionFailure : Fail Open - Reason = Unable to verify the license key
Repeated over and over while Safari was running, over 200 reports in a minute. Googling revealed this to be a component of the Cisco AnyConnect VPN package, something not needed for routine VPN work but that creeps in as part of the default installation. Deleting AnyConnect and reinstalling it without the web agentcwas seems to have been the fix for me (famous last words). There has been a number of discussions about this on this site.
You might try looking at your Console logs to see if anything funky is going.