15mm retraction is huge, even for a bowden.
If you can post the gcode file, we can check the feedrates, but just check that fusion is working in mm/sec. it may be working in mm/min, cm/min, or in/min. If it's set to in/min, that would be about 8.5mm/sec

Also, if it's running in inch/mm then double check that retraction number. It may not be in mm either.