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Which antivirus/security software uses less resources? Kaspersky or Webroot?

I am currently using Webroot antivirus plus antispyware and my subscription is about to run out. I am happy with Webroot, but I want to look at the other options too. My top replacement candidate is Kaspersky, with my following favorites being Trend Micro, and Norton/Mcafee being near the bottom. Is Kaspersky worth the change from Webroot? I don’t want something bogging my system down and hogging all the resources. I thought Webroot did a good job but if Kaspsersky’s resource management is similar and has better detection/removal then I will go with that. I work in tech support and I’ve noticed Kaspersky has a few issues with Windows Sidebar, which isn’t a big deal, but it makes me shy away from Kaspersky. Any thoughts or statistics? Possible links to comparisons of speed or protection? What does consumer reports say? I am looking at Kasp 2010 Internet security and just antivirus

webroot uses less than kaspersky

Need for Speed Hot Pursuit – Patrick Soderlund Speaks.