Another thing for lagness:
When you are intending to use a NOS bottle as soon as you pick one up, keep clicking until you can't hear "NOS activation" sound because the server might think you are still on the pickup spot and would tell your client you got a new nos bottle rendering the currently used nos bottle to switch off. (I hope that makes sence). If you have ever used the /boost command on AGS while using NOS, just imagine the server is /boost ing you heaps.
Thats for laggy people like me though.