I just did a quick test in a 2D contour path and a reduced feedrate showed as cb750chris mentioned, as a different color. It also posted the reduced feed rate. To test this, in cam, choose a very large radius, like 1-2" and look to see if it slows down any arc moves.
if your tool path is represented as a bunch of linear moves, you will need to look at the 'maximum directional change' in the feed optimization field. try setting it to 1 degree and see if any of the linear moves in your path slow down.
I'm using the fanuc robodrill postprocessor which is likely well sorted out.
I did find that with 3d adaptive clearing, if you choose 'both ways', it disables feed optimization (you can't check the box to enable feed optimization) so you need to be careful there.
Mike