Avast Free Antivirus
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Full user review
"Seems to work well in the background, mostly."
Seems fast. Updates are accomplished very quickly. The moving activity graph is interesting. Has been no serious degradation of computer operation since it was installed.
No tutorial for understanding its operations and results---e.g., the moving activity graph. At times apparently interferes with (causes pauses in) YouTube-type video on my underpowered computer (Mac Mini). Don't see a way of disabling it in cases of possible interference with downloading or operation of programs (only 2 cases involving games seen so far).
May very well be excellent in speed and action of operation, especially with the faster computers, and in protection. However, will require some digging to gain understanding and confidence toward all that.