> Does the game have performance issues?

Yes, it has had huge concurrency issues for the entirety of its life. Their solution to large fights has historically been "let us know in advance pls", plus "move systems to beefier hw nodes" and "tidi" which stands for time dilation, where the "tick rate" of the whole server goes down and a fight takes 10-20-100x longer than it should.

It's an amazing concept of a game, but software wise it has been a mess since forever.