Safari slow to load web sites

Go step by step by step and test.

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 the lights are lit properly. It will take a while.

Restart the computer.

Start up in Safe Mode.

http://support.apple.com/kb/PH14204

2. Delete Caches.db

Close all windows and quit all applications.

Hold "option" key down and click "Go" menu in the Finder menu bar.

Select "Library" from the dropdown.

Library > Caches > com.apple.Safari > Caches.db

Right click the Caches.db file and select "Move To Trash.

Close windows and relaunch Safari.

3. Empty Caches

Safari > Preference > Advanced

Checkmark the box for "Show Develop menu in menu bar".

Develop menu will appear in the Safari menu bar.

Click Develop and select "Empty Caches" from the dropdown.

4. Delete Cookies

Safari > Preferences > Privacy > Cookies and other website data:

Click the “Details” button.

Remove all cookies except from Apple, your internet service provider and banks.

5. Safari > Preferences > Extensions

Turn off Extensions if any and launch Safari again to test.

Turn on those one by one and test.

6. Temporarily turn off Safari iCloud sync and test.

System Preferences > iCloud

Uncheck the box beside “Safari” and test.

There are many possible causes for problems with web browsing. Below are some simple steps that may help either to solve the problem or isolate the cause.

Back up all data before making any changes.

1. Restart your router and also your broadband device, if they're separate.

2. If you connect to the the router with Wi-Fi, turn off Wi-Fi and then back on.

3. If you connect with Wi-Fi and you can also connect with Ethernet, do that and turn off Wi-Fi.

4. If your browser is Safari, then from the Safari menu bar, select

Safari ▹ Preferences... ▹ Privacy ▹ Remove All Website Data

and confirm. If the Downloads button (with the icon of a downward-pointing arrow) is showing in the toolbar, click it and then click Clear in the box that appears. The download history will be removed.

5. Select the Extensions tab in the Preferences window. Turn all extensions OFF and test. If there's an improvement, turn extensions back ON and then disable them one or a few at a time until you find the culprit.

6. If you're running OS X 10.10 or later, select the Search tab. Uncheck the box marked

Enable Quick Website Search

if it's checked.

7. If you're running OS X 10.9 or later, select the Advanced tab and uncheck the box marked

Stop plug-ins to save power

Quit and relaunch the browser.

8. Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”

While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.

Test while logged in as Guest.

After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.

*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.

9. Are any other web browsers installed, and are they the same? What about other Internet applications, such as iTunes and the App Store?

10. If other browsers and Internet applications are also affected, follow these instructions and test.

11. If Parental Controls is active for any user, please turn it off and test.

12. Open the iCloud preference pane and uncheck the boxes marked Safari and Photos, if they're checked.

13. Are there any other devices on the same network that can browse the Web, and if so, are they affected?

14. If you can, test Safari on another network.

15. Start up in Recovery mode. In the OS X Utilities screen, select Get Help Online. A clean copy of Safari will launch. No plugins, such as Flash, will be available. While in Recovery, you'll have no access to your saved bookmarks or passwords, so make a note of those before you begin, if they're needed for the test.

 menu/System Preferences/iCloud and uncheck the box for Safari is what Dominic suggested.