How to reduce lag

Is there some setting in game or on roblox that I can use to reduce lag? I've got a PC more than powerful enough for roblox and fantastic wifi, but AO makes me lag like no other. I'm talking like 250-450 ping regularly, no matter the server location. I mostly do PvE content, so it kinda sucks when hit reg just disappears and 5 seconds later I take 4 shots of 600 damage because I didn't even know something was being casted.