Select a material to see how easy it is for the dislocation to move:
Peierls stress = 0.1 MPa
Peierls stress = 50 MPa
Peierls stress = 500 MPa
Peierls stress = 34000 MPa
Applied Stress: 0 MPa
For a wide dislocation...
A lower Peierls stress generally means it is easier for a dislocation to move through the material.
Materials with a higher Peierls stress will have smaller dislocation widths (narrow dislocations), since Δ Up scales with w/b exponentially. Whereas materials with a lower Peierls stress will have wide dislocations. More info on narrow and wide dislocations can be found here -- dislocation width