I usually mix up quick and let it settle for a few minutes before starting the vorlauf. I think you want to make sure that you get clean water mixed thoroughly so it can rinse the residual sugars off the grain particles.
EDIT: I also have started doing a single sparge, so after I drain the mash tun, I do the sparge one time and call it good. Lots of people do a double sparge and likely get a small bit of extra efficiency from it, but I would rather not take the time and effort for the difference.
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