Dramatic improvements to its Norton suite during the past two years indicate that Symantec has been listening to the needs and complaints of its customers. The company's strong and surprising changes to Norton's impact on system performance that it introduced last year are maintained in this new version and a new behavioural detection engine called Quorum shows that Symantec can juggle performance and protection.

Quorum incorporates behavioural detection with Norton Insight, a program-reputation engine introduced in the2009 version of Norton. The purpose of these features, according to Symantec, is to respond faster to mutating threats, while also watching for hibernating infections that pose a potential, but not immediate threat. In the 2010 version, Insight has been split to address four main areas of concern: Download Insight for in-progress program downloads, System Insight for diagnosing system slowdowns, File Insight for file analysis, and Threat Insight for digging deeper into threat origins. Also included is a new enterprise-level anti-spam algorithm that, according to Symantec, shouldn't require any "training" to use. These features were acquired by Symantec with its purchase of Brightmail more than five years ago. Norton Internet Security also includes OnlineFamily.Norton, Symantec's new parental control system and Norton SafeWeb, which is a search results and e-commerce rating component.

Full efficacy analysis isn't yet available for Norton Internet Security 2010, but last year's version scored better-than-average results and what is available for the new release indicates that it score similarly.

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