This is definitely possible to fix but goes back to a post I did a while back, if we knew spec wise what the servers are now it would be a great deal of help. For all we know the JP server could be just running off YAGOO PC in his office while it would do a few people, as we have seen in the past soon as you go like plus 10 people it just fucking melts as it cant deal with that many connections. Now thinking about it now, I do lean towards it being the hardware side of things, as usually Japanese internet is pretty dam good in some areas and considering it's office based now, I "assume" it would be very good now because of all the steaming they do. Here's a rough average of their internet speeds:
View attachment 2599811
What will be interesting to see is what server is technically able to handle more people, because we haven't seen mass people on the EN one yet only on JP. I'm sure we will get some sort of an answer soon. Feel free to read the sort of summary I did below.