title: How do I download multiple dependencies at once in pip?
body: <p>I have a very big requirements.txt file with many many many dependencies... I have to download and install all of them, so the worst part is the amount. My bandwidth is good, but pip downloads files very slowly, I think there is a limit and I can bypass it using multiple download at once.
  So is there a way to download multiple dependencies without the order?</p>
  <p>If the limit is cached for each ip, I need a solution by bypassing it with shadow proxies:)</p>