Got a warning from IB about high order efficiency ratio (OER, ratio of order submitted vs orders executed). It says my OER is too high and I need to adjust my API algo. My OER has been around 150:1 (all orders are limit orders). Apparently after another incident my trading will be severely restricted. This time they specified an acceptable OER of 50:1, which I can meet with minor adjustment of my API. However I'm wondering if anyone has such experiences with IB or other brokerages and what a typical OER is.