Left4Dead2 Visuals Multihack

Thanks for the update, but I ran into a problem when I used speed+lag in single player mode to shoot fast, which allowed me to kill tank with one hit, but it didn't work on the official server. On an official server, my use of speed+lag results in the following situations 1. Weapon cannot be changed and fired 2. It can be changed at low speed and low lag, but it cannot be fired quickly. I tried to turn on the clock option, but it didn't work. I don't know what the problem is. Can someone help me?