Some of those extra features will also consume resources and affect performance. Norton Security Standard, Deluxe and Premium (formerly Norton Internet Security) are suites which means they include additional features in addition to anti-virus protection.
With that said, there are a lot of folks who prefer using Norton (especially if it came preinstalled) and there is nothing wrong with staying with a product you are satisfied with. IMO, Norton is better utilized in an Enterprise system environment protecting many client computers. Those issues plus the cost factor are the primary reason many folks look for a free alternative. I have read from other users that Norton has made improvements in newer versions of their software so they are not as resource heavy as past versions.while others still say differently. Anti-virus software components insert themselves deep into the operating systems core where they install kernel mode drivers that load at boot-up and create files/folders/registry entries in various locations.
Although Norton (Symantec) is as good as any other well known anti-virus program, it is costly, requires numerous services and running processes that consume system resources and often results in complaints of high CPU usage.
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