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It ultimately depends...

Stuka 9th Jun 2009

...on the processes that are running. But their new thread manager should show a noticable difference. By lowering the number of threads when most processes are idle, the system should feel more snappy. As before with 10.5 the OS would spawn a bunch of threads to handle the task. But this actually slowed things down when it came to quick, small tasks. However, when the system is busy, then the OS will spawn threads to better make use of all the cores available to it.

As for OpenCL, this largly depends on the GPU that is in the system, and what processes are able to be offloaded to it. But if some apps such as Final Cut, Aperture, Photoshop, or other math heavy apps are able to make use of it, it could be a huge speed bump. As most GPU's are significantly faster than the average CPU when it comes to pure math operators.