We're using all AOIs at the moment because we didn't know any better when we did our projects. I really want to do a performance test on this, as we've certainly had issues with PLCs being overloaded, even the latest models like the L8x series (maybe L9x is out now?) get choked up (at 1s poll rate we see these at like 160-200% load factor ). @bschroeder said his LF reduced from 100% down to 10%, but it'd be good to get some solid figures to go off.