It was stated in a post that the servers were hitting max resources. If you upgrade hardware then they shouldn't hit max resource, though if you aren't at Standing Stone Games with diagnostics, surely you'd be able to inform us on the lag issue and where it's stemming from.
I am not an SSG employee, but I am a game programmer, and I have also worked as an MMO programmer in the past.
Let me explain briefly.
When you talk to the Banker, it opens not just the Character Bank but also the Reincarnation Bank, even though it’s unnecessary.
This unnecessarily increases the amount of data transferred.
There are many such wasteful designs, but do you think there are no other designs like this?
The number of items has increased, and so has the data that needs to be loaded into main memory.
If the design is outdated, there are limits to how much you can cover with hardware improvements alone.
The number of arts that can be performed and the amount of buffs that need to be processed within a given time, as well as the amount of management required, have increased significantly compared to when the design was originally made.
I want you to understand that there are issues with algorithms that can and cannot be addressed just by increasing machine power.
There isn't a single person in this world who can resist the AoE attacks of our god currently descending upon SSG, the Flying Spaghetti Monster.
If I were an SSG programmer, I would probably have caught the disease of wanting to rebuild everything from scratch.