HankMcSpank , If you have an extra pin available or one you can (borrow) for the test, just set it at the begining and then clear it at the end of the portion of the program you are trying to time. Use a scope or a timer/counter to get the actual timing value.... It works for me... The plus side is the instructions don't add much to offset the timing. (portb.4 = 1).......(portb.4 = 0)

Dave Purola,
N8NTA