Nothing to do with your PC, I've been and out of Quarry mill perfectly fine when leveling to 50, but now I can't do anything. Everything take ages to do. For example mounting takes like 10 seconds, but once I teleport out (which hangs for a while too), it's fine, zero issues. Only happens in Shout Shroud near Quarry, even had people shouting in chat if anyone else is getting the issue, so it's more widespread than one persons PC.