While i do get some lag i am hard wired in. Never ever should anyone go wireless.
As for reaction time i always thought it was me and some said on occasions i should learn how to dodge.
However having died one time after heart phase i would observe players movement for weight of land, and on my screen it clearly looked like the player was in while it went off and yet received zero damage when they moved out
so perhaps it is indeed server or PS3, who knows.