I'll buck the trend and say I've been using Avast free version since 2004/05 ?
Avast also has a 'Do Not Disturb' mode, which prevents it from interfering while running a game. This mode may be useful with your webcam ?
I also use Malwarebytes to cross check Avast occasionally. Generally only when something strange happens that give me
a fright. I've never had a malware/virus though.
- There is no perfect AV. They all miss some things, or produce false positives on occasion, but
they are all also improving over time. Particularly on the false positive level.
The big three Norton, McAfee, and Kaspersky do have history of causing systems to slow down. This was generally
when using their big 'suites' that run all manner of checks, but they have apparently improved on this over the years.
I imaging this would apply to any Anti-Virus that has a whole suite of tools, including Avast though.