I have noticed on a couple of my prints that Slic3r will ignore the slice settings. In the most recent slice the setting for solid infill, perimeters, and infill all have the same speed of 140mm/s. However, when it starts the 20% infill and the perimeters on these layers is visibly slows down. It also should be printing infill every 2 layers during this time, yet it prints every layer.
I have seen this before on other setting on other prints. Does anyone know what cause this?