Ok here are some things that I've noticed. Perhaps they will be helpful in the coders diagnosing the problem:
1) Lag seems to happen at the most incovient times..
a) Fighting, wether sparring or on prey.
b) When auto-walking for example I know how I need to go to get from point a to point b I just enter it all in.
c) Using Way...
I was riding following someone they were riding fast, as we all know inixes are pretty quick (obviously not as quick as erdlu's, but quicker than other mounts). I was trying to contact someone on the ride... I contacted someone... I didn't see anything show up... I contacted them again still nothing... Did this once more... Had to sheath my weapons... Contacted them again still nothing (no fail or succeed note)... Talked some more... Showed up at the place we were going... Then I got all these messages saying I contacted them... No I can't contact this person because I'm already contacted to someone else... Mind you all of the other stuff talking to the person I was following, sheathing my weapons, etc happened pretty much live time...
Maybe this will be helpful, maybe not... I just know from being a support person I like too much information over too little.