Argo has been built using the exact same Real Virtuality 4 engine as Arma III, so you can expect similar performance. The smaller 5v5 match-ups may make Argo less demanding than the full-scale warfare of Arma III.
Argo is an Arma III spin-off created as part of the Bohemia Incubator program. A free-to-play tactical shooter, Argo pits teams of five against one another intense, strategic combat, where a single bullet can mean death. Argo features multiple game modes, weapon and gear unlock systems, a map editor and more.