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There are multiple reasons. First off is the compiler for OSX that is just more outdated than those for Linux and Windows, making it much harder to get certain multi threading options available. We're looking into porting it, but that is why the osx version of Cura has less multi threading options.
Another (more fundamental) problem is that large parts of the slicing process are simply serial; The results of one layer depend on the results of the previous layer. As such, you can't calculate them in parallel.
In the Cura 5.8 stable release, everyone can now tune their Z seams to look better than ever. Method series users get access to new material profiles, and the base Method model now has a printer profile, meaning the whole Method series is now supported in Cura!
We are happy to announce the next evolution in the UltiMaker 3D printer lineup: the UltiMaker Factor 4 industrial-grade 3D printer, designed to take manufacturing to new levels of efficiency and reliability. Factor 4 is an end-to-end 3D printing solution for light industrial applications
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nallath 1,124
There are multiple reasons. First off is the compiler for OSX that is just more outdated than those for Linux and Windows, making it much harder to get certain multi threading options available. We're looking into porting it, but that is why the osx version of Cura has less multi threading options.
Another (more fundamental) problem is that large parts of the slicing process are simply serial; The results of one layer depend on the results of the previous layer. As such, you can't calculate them in parallel.
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ahoeben 1,981
But if you want, I could create a plugin for you that uses your other cores for something useless while Cura is running 😉
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