High CPU loading seen when there is a significant 1553 message rate.
This issue is related to BUS MONITOR setup. If you have performed minimum bus monitor setup, with very few monitor buffers, the API may have trouble servicing the buffers and keeping up with 1553 bus traffic. Increase the number of BM message buffers to 50 buffers or more to solve this problem. Specify the number of BM buffers using the function BusTools_BM_MessageAlloc().
Note that this does not apply if the Bus Monitor has not been started.