u/BasementPhantom

Is it possible that my TPIA ISP is throttling based on OS? When I run Speedtest.net or Cloudflare's speed test on an Android phone during evenings, I get full download speed, but if I run it on a Windows or Linux PC at the same time, I get single digit download speeds. Upload speeds are unaffected. The test is run with the same servers between devices. Tunnelling my connection through a VPN resolves the problem.