McAfee does use a lot of resources and takes up more room on your hard drive (larger footprint). This is a disadvantage of security suites. I removed the McAfee security suite from my dad's Vista laptop and put AntiVir in it's place. Much lighter,faster and a smaller footprint than McAfee. On my XP MCE machines, I removed Norton security suite and put NOD32 in it's place. Same results. Lighter,faster and smaller footprint. Stick with AVG, or even better go with AntiVir. Or NOD32 if you want the best.