The network seems is OK, the internet service provider does not find anything wrong. The Speedtest shows normal speed, other downloads from other sites are as fast as usual. The people on supercomputer side do not find anything changed or wrong, and no one else complained about speed
Why the feature of dividing the file on several streams and simultaneous streaming all of them does not work somewhere? Who controls this feature, WinSCP, end server site, ISP, intermediate network sites?