New in 6.4-4
For applications that do not support setting the number of threads, this section is not visible.
Render on all Cores
Checking this box means that only one job will be assigned to this worker at a time, and that job will use all the cores that are available. You might choose this if your renderer is capable of running multi-threaded, and it is licensed per machine, rather than per core or per process.
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