The good Treads more lightly on your CPU than in the past Bolsters last year's reputation-based detection engine with a new behavioural detection system The bad Doesn't have the highest rate of detection Dramatic improvements to Norton over the past two years indicate that Symantec has been listening to the needs and complaints of consumers. Strong and surprising changes to Norton's effects on system performance introduced last year are maintained in this new version, and a new behavioural detection engine called Quorum shows that Symantec can juggle both performance and protection. Quorum incorporates behavioural detection with a program reputation engine called Norton Insight, introduced in the 2009 version .

See original here:
Norton AntiVirus 2010