How can I solve the problem of extremely slow download speeds when using Baidu Cloud overseas?

It's a PDF of only a few tens of megabytes, but the download speed shows 10KB/s, meaning it'll take almost an hour. A 1.2GB compressed file of project source files sent by a colleague in China shows an estimated download time of "several hours" from overseas. The most absurd thing is that sometimes the download speed drops completely halfway through…