A few things. First off, your lappy's PLENTY powerful for what you're doing. (One of the systems I use in my soundrig is an AMD K-6/2-350 for christ-sake! lol) Load and run Spybot S&D, as well as GRISoft's AVG antivirus to make sure there's no nasties running around eating up system resources.
End ALL processes that are un-needed. (What OS are you running BTW?) I use PowerPack 2005 on my machines which not only allows me to not start un-needed apps at startup, but also has a nice utility to help with my NEXT suggestion, which is:
CLEAN UP YOUR REGISTRY!
Memory CAN be an issue. I'd recomend no less than 128 megs with win 98SE, and POSITIVELY no less than 256 megs with XP.
DEFRAG your hard disk FOR SURE!
Please PM me and let me know how that works out. OBVIOUSLY, you need to get this sorted before you use your lappy at another gig.