When you do things slowly. In English, we will say: pls, be Quick! Do you know in Chinese?
快点儿，别磨蹭了！ 快一点！ 麻烦您快点儿！ 拜托，请快一点好吗？
There are many expressions in Chinese It is common to say:可以快点吗？ Waiting a little angry will say: 能不能快点？ Or, 拜托，快一点好吗？
In Chinese, 请快一点儿 or 请加快速度 are formal expression, you could also say 利索点儿，别磨蹭了， 别磨叽啦， 快快快... in different scenarios, those phrases are casual expression.
请快点儿 is the most right answer, but depends on the situation and the people who you talk with, we can translate it in many different ways, like 赶紧的，咱抓紧点儿，麻利点儿，麻烦快一点点 and so on ~
Chinese has a lot of expressions write a little:请加快速度 Be polite :麻烦请快一点儿啊 A little angry：能不能快点儿啊，来不及啦 Be playful：拜托，快点呀，我等的花儿都谢啦 I hope it worked out for you！
In mandarin we will say 可以快点吗？ In Cantonese we will say 唔该！拿拿声/bang bang声/我数三声1.2....