Here's how you can fix Safari web browser freezing issue on 13-inch Retina MacBook Pro running Mac OS X. This is an official fix coming straight from Apple.
Shortly after releasing public beta 3 of iOS 9.3.2 to testers, Apple has now released OS X 10.11.5 beta 3 to both developers and public beta testers, as well as tvOS 9.2.1 beta 3 for Apple TV 4 to developers registered of Apple Developer Program.
