I keep an average fps. This is handy when running at high fps, as when running at 1000 fps monogame can spike either way.
I also set a debug key (f5 or something) to reset the average fps. As once you scroll through your menus (generally run at a high fps) and your in game it takes a while for the average to settle
I also keep a skipped frame counter. Have a separate counter at the end of each update loop and one at the end of the draw loop for fixed fps. The skipped frames will be the difference between them. If your skipping frames then your doing too much computation in a frame somewhere