If you are getting lag, then report it in the help forum. Make sure you consider this:
18:02 <ppy> !faq lag
18:02 <BanchoBot> Lag is a very general term, which can be used to describe just about
anything going wrong with anything.
18:02 <BanchoBot> If you are going to complain about lag, please be specific in
exactly WHERE the lag occurs, and WHAT it involves (internet lag?
graphical freezes? slow framerate? input lag? brain lag?)
18:02 <BanchoBot> Also mention when the "lag" occurs, if there are any special
conditions for it to occur, and if you have any idea what caused it.
Also make sure to check nothing else is running on your PC which
could affect CPU/memory/disk usage.
The most important fact being when it occurs, and if it always occurs in the same location. Exact second values are helpful. Specifying the maps it happens on is helpful. Giving any kind of detail is helpful. "my game lags" is not.