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OpenCL is an open framework that enables a computer to recruit all manner of other computational devices (such as a GPU and additional CPUs) to distribute a workload. Depending on the hardware you have available, OpenCL can speed up graphics processing by orders of magnitude.
Strengths [Weaknesses]
Parallelism
Your computer potentially has a lot more computing power at its disposal than what you are using. Unlock it with OpenCL.
Weaknesses [Strengths]
Specialised
OpenCL is becoming more common, but for now it is still fairly specialised. Not all applications (or the OS itself, for that matter) utilise OpenCL, and even if they do, OpenCL depends heavily upon the hardware it has available. If your system is not top-of-the-line, you may not see much of a improvemnt.
See Also
MakeHuman
K3d
Kdenlive
Lightworks
Natron
Synfig Studio
Mitsuba
Luxrender
Yafaray
povray