I have 1 Gbits down/up fiber, and I run Filezilla FTP server (I'm in Sweden) and a person in the USA needs to download from me. He has 60/8 internet so he should be able to download about 7.5MBsec but only gets 350KB sec. He can upload 1MBsec to me.
The latency is about 155ms and I have:
CMD: netsh interface tcp set global congestionprovider=ctcp
...and FileZilla xml config:
Socket recv buffer size 4194304 Socket send buffer size 1162500
With 1162500 the TCP throughput should be about 60Mbit with 155ms, but it doesn't work.
Anyone know what the problem could be?