What does speed enable you to do?

Answer 1

At the start, it makes you feel energetic and happy, sometimes euphoric, it makes you talkative and very sure of yourself. It can also make you crave sex, although it doesn't work like Viagra, so no performance guarantee if you're a guy. It also suppresses any hunger feeling, so some use it as a means to lose weight. The negative effects: a very dry mouth, sleeplessness, grinding of teeth, dizziness, headaches, sometimes either diarrhea or constipation, and finally the so-called comedown: the "Tuesday dip", a day of listlessness, irritability, feeling down and similar feelings which can last well beyond Tuesday: one day to one week. Over time, the negative effects will start to outweigh the positive effects unless you start to take higher or more regular doses for your 'ups'. And that is of course how addiction starts.

Answer 2

speed enables you to travel somewhere in a certain amount of time