"Server issues" will never be fixed, it's something the developers will be grapling with for years because of how the game was created.

"Server issues" can span a massive plethora of possible issues, not just UI speed. It's not like SE can just flip a switch and everything be solved they have to find a solution, then make sure that solution doesn't screw everything else up in the process. It's not something that can be "Fixed" it's something that can be improved upon.