As far as developers are concerned, the integration of Grand Central, OpenCL and a 64 bit kernel will allow you to take full advantage of the dual processing power of Intel Macs.
If your Mac is operating at a slow pace, then for that reason alone it is worth the upgrade to OS X 10.6 Snow Leopard.
This version of Apple's OS also has a reduced footprint. This update does not have stacks of new features, rather overall improvements and efficiency upgrades.
Download the latest versions of the best Mac apps at safe and trusted MacUpdate. Mac OS X 10.6.8 Snow Leopard is an upgrade to the previous version of OS X Leopard. Mac OS X 10.6.8 Update 10.6.8 v1.1 - Combo v1.1.
