Basic Setting for NIS 2010 for Netbooks

Hi, I just loaded NIS 2010 on a netbook with 2GB of ram.  It seems that email scanning is slow.  Is there a way to set NIS to basic necessary settings that will increase speed on a relatively slow PC?  Will all the settings it would seem that they not all necessary for basic protection.  Thanks for your help.  Andy

 

Asus eee 1005 HAB - Atom N270 1.6MHz