So I just want to say from my experience.
And Pardon for my grammar 'casue I’m not native.
Before my friend and I move to the official server #1930-PVE(American server) with no ping
We were playing in asian official server#1326-PVE.
The reason we “immigrant” was because there were some Chinese guys who, accordingly to one of the experienced Japanese in game told me, use the accelerator addons.
For what I can dig up, the accelerator addon could make the user playing in really high speed. But make the server’s ping so high that the other player would start to lag, progress backward ,etc.
How do I know those Chinese guy did that? rahter than just the server crowded with people cause the lag?
Well there was one time that the only people on the server were that rumored addon using Chinese clan and me. And It was still lagging with high ping. And for days my friends and I could not do anything because of that high ping. that’s why we immigranted.
Anyway. Today, the server in #1930-PVE have the similiar situation.
I’m not saying it must be the Chinese guys in the server use that. but it’s some clue that the dev should probably look into.
And remember this post in Steam forum
someone already warned you guys three years ago.