The roadmap sticky shows what I am working on.
Well, for example I am paying a lot of money for litespeed and cache. I do not know if that is working or not. I set it up today but I cannot verify that it is caching the pages yet, so I am waiting for answers on that. Also, I am looking at caching css. That will help both logged in users and guests. Next, there is session caching, which will help logged in users. It is all a bit complicated in the backend, which is why its not just a flick a switch kind of thing. It requires tons of researching, reading, asking questions etc.