Singapore server slow Upload Speed when Inbound Connection (port forwarded)

[danivideda 0]

When I'm using Eddie and connected to SG servers, the upload speed always gets throttled and it is very slow. It only happens when it is an inbound connection, as I don't see any problem when I'm checking using speedtest.net (as it is an outbound connection). So I've been using "copyparty", a tool to easily create a "file server" and then host it. I use it to measure the upload speed I get when connected to AirVPN and port forwarded to my :80 port. I use another laptop to download something from my my machine that's connected to AirVPN Singapore server, and each file download it is always throttled to around 100-300KBps. So it's not the "overall speed become 100-300KBps", but rather, it is throttled "for each connection". So basically I can download 5-10 files simultaneously but with only 3 Mbps speed for each file. My internet has 50 Mbps upload link speed, so I know it wasn't it.

This only happens with Singapore servers, as I've tried the same with Japan server and it's fine, I can see the speed doesn't get throttled, and it gets the full 50 Mbps upload speed.
What happen with Singapore server? Why does the upload seems to get throttled when it is an inbound connection, and I've observed that it's being throttled for each connection?

Edited ... by danivideda

[danivideda 0]

Singapore server has become really slow in general now, looks like many website flagged M247 ISP and throttles it. My 75Mbps download speed only got 6-8 Mbps when testing in Speedtest in Singapore server: https://www.speedtest.net/result/19251282595

Edited ... by danivideda
added speedtest