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There are two parts to retraction: distance, and speed.

65 mm/sec is faster than normal; 40 is the "stock" speed. One of the 3D printing gurus, "Chep", recommends slowing this down to 25 mm/sec.

The stock setting for Distance is 5 mm. He has 8mm. That seems like a lot to me, but to be honest, I haven't tried going that high, so maybe it helps with certain stringing situations.