Thanks for bringing up this point also, another thing to do to reduce lag/latency is to reduce your settings, I was playing everything on max, and when I started Av 17 min speed runs, I noticed even entering I was behind a few secs.. I lowered it to 8 (standard across the board ) and I noticed a HUGE increase in my responsiveness when using abils and dodging..
So try lowering your settings, it will help.