Mutt
Welcome to the forum
What version of avast! are you using and how much processing power does your computer have?
Also, what are your setting for the avast! Standard Shield?
While playing the game, you could try setting your firewall to block all incoming traffic and then
pause the standard sheild. (right click on the
a and select pause providers and then select Standard Shield)
If that works, don't forget to Resume the Standard Shield after you finish playing.