Q: Safari loading problems

1. Power off the router. Unplug it from the wall. Wait a while.

    Plug it back to the wall. Power the router on. Wait until all lights are lit properly. It will take a while.

    Restart the computer.

    Start up in Safe Mode.

    https://support.apple.com/kb/PH18760?locale=en_US

2. Disable Extensions and test.

    Safari > Preferences > Extensions

    Uncheck boxes beside “Enable Extension”  and test.

    Enable Extensions one by one and test.

    To uninstall any extension, select it and click the “Uninstall” button.

If your Mac is running v.10.10.2 as your profile suggests, update OS X. The latest version for Yosemite is v10.10.5

Instructions here >   https://support.apple.com/en-us/HT201541

Restart your Mac after the update(s) are installed then try Safari.

If that doesn't help, you may have a Safari extension or third party plug-in installed that's causing a conflict.

From the Safari menu bar click Safari > Preferences then select the Extensions tab. Uninstall one extension at a time, quit and relaunch Safari to test.

If it's not an extensions issue, try troubleshooting third party plug-ins.

Back to Safari > Preferences. This time select the Security tab. Deselect:  Allow plug-ins. Quit and relaunch Safari to test.

If that made a difference, instructions for troubleshooting plugins here.

Safari - Unsupported third-party add-ons may cause Safari to unexpectedly quit or have performance issues

Safari doesn't load a page or webpage items are missing

Safari/other browsers – Website not loading

If the Develop menu isn't showing in the Safari menu bar, select

          Safari ▹ Preferences... ▹ Advanced ▹ Show Develop menu in menu bar

Uncheck any checked items in the menu that start with the word "Disable." You can then go back to the Preferences window and disable the Develop menu itself, if you wish.