adding safe sites to safari

You can block any website by adding it to your Windows HOSTS file. And for example, add the following scripts will block facebook and myspace.

And there is a detailed tutorial to explain how to edit hosts file.

May be it's the proxy issue?

1. Click Start and open the Control Panel.
2. Open the "Internet Options" Control Panel.
3. Click the "Connections" tab at the top.
4. Click the "LAN Settings" button at the bottom.
5. Uncheck the "Automatically Detect Settings" Box.
6. Click OK to exit the "LAN Settings" window.
7. Click OK to exit the "Internet Options" window.

Fix For Slow Safari On Windows