It becomes worse if you are using some free VPNs out there. VPN servers might not be able to match your ISP’s download speed, and for the same reason, it is advised that you turn off VPN before attempting to download a game via Steam. If you use a VPN or Proxy, then it can affect the download speed of Steam. You can also move to the Startup section and disable some apps with high network usage that you don’t use very often. Repeat the same process for all apps having high network usage and end task.