iTunes 10.4 is live and available for download now!
Updates including Full Screen mode to bring you full music experience without other apps distracting your view.
Some users gave feedback that the iTunes 10.4 is blazing fast on Lion, it just simply pops out of the dock without having to wait like the usual 3 seconds start-up.
This was quoted from MacRumours regarding the new iTunes 10.4 :
"The primary advantage afforded 64-bit applications is the ability to address more than 4GB of memory which can be a distinct advantage for applications which use large data sets. Adobe, for example, received some criticism in 2008 that their Photoshop products were slow to adopt 64-bit mode on the Mac. 64-bit Photoshop for Mac ultimately arrived with CS5.
The reason for the long delay was the fact that Apple dropped support for 64-bit mode in Carbon back in 2007, requiring developers to port their existing Carbon applications to Cocoa in order to take advantage of 64-bit mode. This primarily affected older applications such as Photoshop and iTunes which had existed prior to Mac OS X and were still using Carbon, Apple's legacy API. Meanwhile, Cocoa was Apple's native API for Mac OS X and offered some additional user interface advantages. For better or worse, many users saw Cocoa applications as superior to their Carbon counterparts due to historic baggage of many of the Carbon applications."
Download iTunes 10.4 from here.