As you might know, I live in Canada while my home server is located in Macau. Both sides have decent internet connection: 150Mbps symmetrical in Macau, 350/100Mbps in Canada. While not crazy fast, this is fast enough for most cases, even for transferring large files. But there is a problem: I can never get this speed...
The problem
The problem is simple: I can download from my home server somehow close to the limit (150Mbps) but I can only upload at less than 10% of theoretical upload speed, seemingly for no reason.
The investigation
I tried running speedtest from Canada to different hosts in Macau: different ISPs, my server with LibreSpeed, my server with iperf. I found that I only get good speeds when I use multiple connections: multi connection feature on Speedtest.net, iperf with LOTS of parallel streams.
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