I'm building a fbx export node using top network. In general, there are only 3 .fbx files which means only 3 work items exist. I set the "Slots Per Work Item" to 6 (10-core CPU has 19 slots at most), which would lead to 18 slots resources active at runtime. But seems that the houdini doesn't assign many slots to a work item: only 3 hython.exe process are active, and ~30% CPU utilization at most. Is there any other settings I missed or rop fbx node can only work on single core?