Thanks for checking it out again. I removed the -rc version. That version recalculated the FPS once a second with the goal of being more reactive to slowness, but it would defintitely feel more jerky. I would have expected that with a program as simple as this and looking over an entire second (> 100 frames) we'd stable FPS numbers, but that doesn't seem to be the case. Anyway I removed this version based on your feedback.