Me and my friend like to play Ground RB together, but for some reason on the SA (Japan) server I get 200-240 ping and unstable packet loss (ranging from 3-20%), and he’s able to stay on a consistent 140 ping with 1-2% packet loss, which makes no sense because we are both from OCE, living in the same city. I’ve figured out that on the SA (Singapore) server we both get 90 ping each and 0 packet loss. I also tried queuing NA, and the server was 240 ping, but it was stable packet loss + ping, so this makes me believe it’s something to do with my connection to the Japan server in particular. If anyone could give me some tips on how to fix this that would be great.
If you and your friend are on different internet providers then that may explain differences in the ping/PL you are seeing, as you may be taking different network routes to the game servers.
I get a similar experience to you. The SA servers are “closer” in ping, but they are always more unstable in both ping and PL throughout a game and can fluctuate wildly. I rarely use SA any more and just use NA (EU/CIS are just too far away). Even though NA has a higher ping, it’s a lot more stable and consistent, which is way more preferable.
This isn’t Gaijin issue, it’s an ISP issue. If you’re with a good provider they will work with you to fix international routing. I’ve done this before with mine. If you can gather the server IP for SEA server you can do tracerts and then email them to your provider, providing they’re not some trash tier ISP.
My ISP markets themselves as the 'internet for gamers’, so they really go above and beyond for me… but any decent ISP will help you.
Edit: Note, Gaijin doesn’t advertise the IPs for their actual game servers, for obvious reasons, but you can use stuff like wireshark to get it.