This update contains various bug fixes and improvements to performance, stability, compatibility, accessibility and security, including fixes that:
Improve JavaScript performance up to 13% over Safari 5.1*
Address issues that could cause hangs and excessive memory usage
Improve stability when using Find, dragging tabs, and managing extensions
Improve stability for netflix.com and other websites that use the Silverlight plug-in
Address an issue that could prevent East Asian character input into webpages with Flash content
Address an issue that could cause History items to appear incorrectly
Improve printing from Safari
Address an issue that could prevent the Google Safe Browsing Service from updating
For detailed information on the security content of this update, please visit this site:
Apple security updates
*Testing conducted by Apple in August 2011 on a 2.7GHz Quad-Core Intel Core i5-based iMac 21.5-inch system using Mac OS X v10.6.8 Snow Leopard and configured with 4GB of RAM and an AMD Radeon HD 6770M with 512MB of VRAM. JavaScript benchmark based on SunSpider 0.9.1. Performance will vary based on system configuration, network connection, and other factors.