| Option Category | # # OSD PERFORMANCE OPTIONS # |
| Description | This option lets you set how many cores are used on multi-core CPUs. This allows you to keep cores free for other use or use the whole lot. Leaving this on auto will use all the cores that are available. |
| Full Command | -numprocessors <integer> |
| Alt. Command | -np |
| Reverse Command | none |
| Example | mame64.exe tekken2 -np 4 |
| mame.ini Command | numprocessors |
| Command Default | auto |
| Argument Format | <integer> |