High CPU usage on Impact machine? March 5, 2017March 5, 2017 IBM Customer Community What can be done if high CPU usage is notice on the box where Impact runs? Related:Questions on controlling alarms from PIGWLeibfried replied to the Instantaneous CPU usage of processes topic thread in the Performance Tools Forum forum.nagger replied to the Instantaneous CPU usage of processes topic thread in the Performance Tools Forum forum.Why LFA causes CPU usage high?Machine Check Event reported is a CPU thermal throttling event reported from CPU %1. The CPU has dropped below the temperature limit and throttling has been removed. %2 additional error(s) are contained within the record.