How do you improve speed at work?

At my last job I was very quick maybe after a week after I started. Granted it was a grocery store so was pretty easy for me. But this place is a manufacturer company and im packing boxes. It’s somewhat like bagging at a grocery store but the items need to be perfect or very close to. So fast to me is too slow to the manager. But he seems to have confidence in me that I’ll be good. But I want to be very good asap because I don’t really have patience with myself sometimes so I just want to be better than everyone there. So what tips do you have, tips that helped you in your career to get very quick?
How do you improve speed at work?
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