Player with low-end network (mostly low bandwidth) will experience unbearable lag while joining the server. I do not have a direct proof for this, but this seems to be our current situation: Upon player joins the server, the server will start sending him data. This include chunks, mobs, chats etc.. All packets does not seem to have a priority. When a player has just joined the server, his packet queue will contains a lot of chunk data (big ones). Since packets does not have a priority system, he is not able to receive other packets before chunk has finished loading. For instance, a player joins the server, and someone said hello, the player will not be able to see the greeting before all chunks are loaded. So I am looking for a way to somehow modify packet sending queue. I believe it is possible (via nms maybe), so if anyone have idea or experience can help me achieve this? Maybe useful things: NMS method "EntityPlayerRef#chunkQueue#get(EntityPlayer)" exists NoLagg plugin somehow can modify chunk sending queue.