not much to explain...go inside Cave of Sadistic Glee when the event starts and kill bosses drops are yours
I can add in that this is more likely to do with the PWI client itself, as even on the offical server that PWE runs. The lag can be very horendous, the main cause is a memory leak that makes the client suddenly jump (on my system) from a 250-350k area to 800k - 1.5 mil area. This will cause it to freeze, and usually D/C or crash.
check the screenshots