While it had a minor impact on boot times (around 10% slower), it showed almost no slowdown during web browsing or common file management tasks like zipping and unzipping files.
The suite used the SONAR (Symantec Online Network for Advanced Response) behavioral detection engine and an automated firewall that made security decisions based on an extensive file reputation database. Symantec Norton Antivirus 2013
The software included Norton Safe Web to flag dangerous sites and tools like the Startup Manager to help users control which programs launched at boot to save resources. Norton Internet Security 2013 test and review While it had a minor impact on boot
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