vtkStaticCellLocator problem (vtk9.0.3)

Hi, Jens

i have just replace vtkCellLocator with vtkStaticCellLocator in vtkImplicitPolyDataDistance, with nothing else.
but the process is as slow as vtkCellLocator,
i`m sure smp is supported since other classes with smp is quite fast
am i missing something? what other change should i take?
thanks