Sorry SE, but endgame won't work if you don't fix something.

[Bearssi]

People have used computer specs as an excuse for this and have not realized to calculate how much it really values in what you see on screen and reaction times.
I am not expert in calculus and these are just what ever comes to mind.
If a player has 10 frames per second which is a frame every 0.1 seconds if the frame occurs in steady intervals. This means the 0.3 seconds (rumored position check) + latency + invisible frame can actually cause you to see the cast bar and danger areas 0.5 seconds later than it occurs server side. So computer specs do contribute to this by smaller factor and only when your fps is really low.