Ideally I'd like singulo and explosion lag gone, as well; getting a new GC slotted in will help immensely towards this; ZAS will still be an issue, but that could potentially be tackled, too.
Just a matter of effort, time, skill, and knowledge of the code, really--ours and others.
Oh yes, definetly, I am just saying that the master controller is not a main problem, personally I think ZAS is more of a bitch.
We should always be open for optimization, but maybe not when it would require 7 hours of work for a slight increase in performance, of where there were no real issues in the first place.