I thought you might be interested in looking at [Answered] ArmA 2 - Multicore-CPU support flawed? (only 50% CPU usage on quadcore).
https://forums.bohemia.net/forums/topic/72381-answered-arma-2-multicore-cpu-support-flawed-only-50-cpu-usage-on-quadcore/?do=findComment&comment=1292960
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