I love YaBB 1G - SP1!
If they so it is real most likely, figure out why it is faster, if it requires frame precision then ditch it. But don't go by your guts as well, perhaps here, but if you do it here then you might be doing that on other areas as well. Anyway, test it, not in a full run, just find a long stretch, and once your movement is isolated from other factors, test both with video-frame precision like here: