I writing to you from China, but ever since I came here, my PL and Ping have made the game basically unplayable. This didn’t happen when I visited China last year.
The ping and PL are sometimes abnormally high on the SA server (at least, more often than others), this is an issue that has not been fixed for years. Due to this I advise you manually select the CIS, EU, NA servers as preferred.
How do I do select the other servers?
In game mode select, at the bottom, there is the option. Unfortunately you must deselect auto select (making it impossible to simultaneously select SA) to select other servers. Also, the connection problems are likely to not resolve even while using better servers.