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.
edit: maybe the path to unlimited processing speed is to send a data center through space near speed of light. That's how it works right?
How much of that is down to processing time is unclear, but I think it's fair to say there is scope for improved performance.
Secondary to that, if you have general performance improvements then you can afford to run a smaller server cluster or smaller servers, reducing costs.
This is referred to as Time Dilation (TiDi) in EVE -- https://wiki.eveuniversity.org/Time_dilation -- it's an interesting engineering rathole, Fenris f/k/a CCP has been pretty open about their stack, and the challenges that have built up.
Anything that speeds up EVE lets more players cram in without experiencing TiDi, and this might let the devs escape Stackless Python, which is another interesting engineer rathole. (It's ratholes all the way down, and this is the one that got EVE on my radar, and has kept it there.)