The reason why that guide doesn't work is because it isn't technically lag you are dealing with currently. We are all experiencing basically the same thing. It is just some major delay issues that the server is experiencing, due to Raz and others trying to repair the hard drive crashes that have took place several days ago, as said by Warrior4ever. All you can do is wait it out and find other things to do while waiting for the server to respond correctly again. c: