The Number of threads for parallelization option is set to Single thread (No parallelization) by default. This means the parallel solution method will not be used. You can specify the number of threads to be used for parallel solution.
If you set the Number of threads for parallelization option to Maximum, the analysis will be run using the maximum number of physical processors available for parallelization. This includes multiple cores, but does not include additional logical processors made available by enabling hyperthreading.
If you set the Number of threads for parallelization option to Specify number of threads, you can specify the number of threads you want to be used for parallelization.