The majority of this performance boost is enabled by the new SquirrelFish JavaScript interpreter, improving the JavaScript rendering performance of Safari by over 50%. The new Safari 4 includes a boost in JavaScript and HTML performance, which results in faster web browsing. The rewrite of Finder in Apple's native Cocoa API allows the Finder to take advantage of the integrated 64-bit technology, as well as Grand Central Dispatch, use a more user-friendly disk-eject (clearer dialogs will notify the user of what services or programs are using a given disk), and provides it a more responsive overall feel. As a result of the low price, initial sales of Snow Leopard were significantly higher than that of its predecessors The release of Snow Leopard came nearly two years after the introduction of Mac OS X Leopard (version 10.5), the second longest time span between successive Mac OS X releases. On August 28, 2009, it was released worldwide, and was made available for purchase from Apple's website and its retail stores at the price of US$29 for a single-user license. Snow Leopard was publicly unveiled on Jat the Apple Worldwide Developers Conference.
Mac OS X Snow Leopard (version 10.6) is the seventh major release of Mac OS X, Apple's desktop and server operating system for Macintosh computers.
