Hello,
I found the solution: use vtkTableBasedClipDataSet instead of vtkPVClipDataSet. Both are the fastest methods but vtkTableBasedClipDataSet is available in all Paraview versions. I left below a comparison of VTK filters clipping speed:
COMPARISON OF VTK-BASED CLIP METHODS:
vtkTableBasedClipDataSet() → It is the faster. Works in all ParaView versions
vtkClipPolyData() → 400 times slower than vtkTableBasedClipDataSet
vtkPVClipDataSet() → vtkPVClipDataSet is as fast than vtkTableBasedClipDataSet but only works in ParaView 5.5
vtkClipDataSet() → 400 times slower than vtkTableBasedClipDataSet