I might have some suggestions about how to speed up the server but what do we run? Is it Mangos on a Linux server?
I compile the Kernel with -O3 and -march=native (well, you can use the specific CPU switch but GCC detects it just fine) along with removing everything that isn't necessary and that really speeds up the entire system. You could do that with the actual Mangos, or whatever server is used, also and it can make a huge difference.
The database is what I'm curious about too because I can't find certain items that Wowhead reports should be there.
In the past, I have compiled Arcemu and Mangos successfully and they ran very well, even on slow PCs due to all the optimizing of the OS, Kernel and the WoW server code.
Was Openwow the most accurate database? Can it be fully downloaded? I am only familiar with UDB, YTDB and PSDB db. This reminds me, it might be possible to recompile the components that access the database. I have never done that myself because my own private servers only had to serve a maximum of 4 people. lol!
So for example on my system, it's mysql-server-core-5.7. That possibly could be compiled and make to run faster.
In addition, new work has been done on the Kernel 4.5.4 regarding the network stack. Some high traffic sites complained that the Kernel needed a boost, like BBC TV, and that was somehow addressed soon after. For Warmame, it would only be important to compile in the security components and leave out the unnecessary bits to really speed it up.