Safari not loading pages, other browsers doing fine

Question

Hi,
I have an issue many seem to have: Safari 7.0.5 (and now 7.0.6) hangs when loading web pages whereas other browsers (Chrome, Firefox) work just fine. I've ran my tests on WiFi with two different routers as well as through iPhone tethering.
Here are the steps I have taken so far but the problem persists:
- re-installed my MacBook Air completely with the latest image from the App Store
- Reset Safari
- Disabled extensions
- Unchecked "Warn when visiting fraudulent website"
- Unchecked "Stop plug-ins to save power"
- In the Develop menu, checked "Disable caches"
- In WiFi settings, disabled IPv6
- Changed DNS to OpenDNS
- Deleted all Safari plist, caches, favicons cache, etc.
- Turned off Safari in iCloud settings
- Fixed permissions, rebooted
- Disabled the prefetch setting from terminal
- Emptied all my logs, launched Safari and tried to open this url: https://pragprog.com/login . Here is the (anonymised) result:
20/08/14 17:12:05.179 ubd[178]: ApplePushService: Timed out making blocking call, failed to perform call via XPC connection to 'com.apple.apsd'
20/08/14 17:12:05.681 AOSPushRelay[252]: ApplePushService: Timed out making blocking call, failed to perform call via XPC connection to 'com.apple.apsd'
20/08/14 17:12:05.909 parentalcontrolsd[271]: StartObservingFSEvents [849:] -- *** StartObservingFSEvents started event stream
20/08/14 17:12:06.112 UserEventAgent[11]: Captive: CNPluginHandler en0: Authenticated
20/08/14 17:12:06.513 accountsd[212]: /SourceCache/Accounts/Accounts-336.9/ACDAuthenticationPluginManager.m - -[ACDAuthenticationPluginManager credentialForAccount:client:handler:] - 230 - The authentication plugin for account “[email protected]" (20DDC449-9F11-4479-8D9C-11BBC43D96AD) could not be found!
20/08/14 17:12:06.514 accountsd[212]: /SourceCache/Accounts/Accounts-336.9/ACDAccountStore.m - __62-[ACDAccountStore credentialForAccountWithIdentifier:handler:]_block_invoke389 - 857 - No plugin provides credentials for account [email protected]. Falling back to legacy behavior.
20/08/14 17:12:06.668 com.apple.time[148]: Interval maximum value is 946100000 seconds (specified value: 9223372036854775807).
20/08/14 17:12:06.708 com.apple.NotesMigratorService[272]: Joined Aqua audit session
20/08/14 17:12:06.784 gamed[215]: CKSoftwareMap: Registering with Daemon
20/08/14 17:12:06.922 soagent[188]: No active accounts, killing soagent in 10 seconds
20/08/14 17:12:06.925 soagent[188]: No active accounts, killing soagent in 10 seconds
20/08/14 17:12:08.771 login[276]: USER_PROCESS: 276 ttys000
20/08/14 17:12:14.115 apsd[99]: Failed to evaluate trust: No error. (0), result=5; retrying with revocation checking optional
20/08/14 17:12:16.041 login[276]: DEAD_PROCESS: 276 ttys000
20/08/14 17:12:17.915 soagent[188]: Killing soagent.
20/08/14 17:12:17.916 NotificationCenter[175]: SOHelperCenter main connection interrupted
20/08/14 17:12:17.916 com.apple.dock.extra[183]: SOHelperCenter main connection interrupted
20/08/14 17:12:17.917 NotificationCenter[175]: SOHelperCenter main connection interrupted
20/08/14 17:12:17.919 imagent[194]: [Warning] Denying xpc connection, task does not have entitlement: com.apple.private.icfcallserver  (soagent:188)
20/08/14 17:12:17.919 imagent[194]: [Warning] Denying xpc connection, task does not have entitlement: com.apple.private.icfcallserver  (soagent:188)
20/08/14 17:12:21.911 Dropbox[210]: ICARegisterForEventNotification-Has been deprecated since 10.5.  Calls to this function in the future may crash this application.  Please move to ImageCaptureCore
20/08/14 17:12:23.437 com.apple.SecurityServer[15]: Session 100006 created
20/08/14 17:12:24.189 apsd[99]: Unrecognized leaf certificate
20/08/14 17:12:39.791 apsd[99]: Unrecognized leaf certificate
20/08/14 17:13:48.016 apsd[99]: Failed to send activation record to service com.apple.ManagedClient.enroll
Any help with this issue is greatly appreciated, it's driving me nuts and currently have to use Chrome.

Answer 1

Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
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. Same problem?
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.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Please take this step regardless of the results of Step 1.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.