Mac OS X Sorbet Leopard offers a significant jump in speed and security over the original Leopard by employing advanced methods of performance optimization and system streamlining, the end result of which directly rivals the user-facing improvements seen in Snow Leopard on Intel platforms.
As an esteemed user of Sorbet Leopard (10.5.9), here's what you can expect during day-to-day usage ...
o Faster startup times, application launch times, and network performance
o Smoother and more fluid UI animations and interactions
A PowerPC G4 (7400) processor or better
512 MB SDRAM or better
A 20 GB Apple Partition Map-formatted partition or larger
A Core Image-supported video card is strongly recommended
A USB 2.0 interface is strongly recommended
Use of flash-based storage is suggested