Brief very slow moves near top layers
Are the layers where this is happening smaller than previous layers? Many slicers have a minimum layer time setting where if the layer takes less than X time, it will either slow the layer down or possibly pause until the time is reached.  

This can be useful to allow the previous layer to cool down and harden up a bit before more hot plastic is added.  If you're not having issues cooling the print then you could disable this.  I've only ever used Slic3r, KISSlicer, and Simplify3D so I'm not sure where the setting would be in Cura but those slicers all had/have the option.