4 core and 6 core rendering the same - no speed increases

Please, anyone have Mac Pro 12 cores to make a filter forge benchmark?

Also I have you have finally changed to the new processor

multi thread speed - 8 cores? 6 cores?

How have you done the measurement of the speed difference?

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GMM Speed increase on multi-core CPUs greatly depends on the filter itself. If the filter has many blurs, anti-aliasing and other bitmap-based stuff it won't scale linearly with more cores.

As GMM say, is very important to notice and see a diference in time in rendering is to know WHAT FILTER (or filters) are you using to measure it, as it not at all the same a fast filter than a slow one that would much computer power to finish, and also the kind of filter and how the filter works, and you should test it with different filter styles.

And not only is very important the filter, also WHAT RESOLUTION that you are using to make the benchmark measurement, as is not the same to make a 1000x1000 than a 6000x6000 result to see better a real speed difference.

The tests I have done is with the time measurement with a digital clock that found on internet at first, but then after aba made the incredible and awesome Batch GUI tool is much more easier and faster to make benchmark easily and with very exact time measurement for diferent resolutions.

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Does FF4 optimize for more than the 4 cores ( 8 threads)?

Vladimir said that FF was optimize for multi-core and to be able to use as many cores as you have

As GMM has told, maybe is the problem on how the different filters are able to process the information as they are all very different and have different component combinations that will make the render speed different

Different filters will produce different results. We've run Wood and Frozen Window: rendering speed with 4 cores is ~3.5 times lower than with a single core. Sorry, we have no 6-core machine in the office.
However there are customers who use FF on 64-core rigs and are satisfied with performance scaling.