In the manual control pane, the extruder section, there is a single arrow on the lower left and a double one on the right. What is the difference? There's only one for retraction.
Retraction is always fast. For extrusion until you are at the head fast extrusion e.g. for filling a bowden is possible with right arrow while left one is using slow speed. In Printer Settings you can set both speeds.
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