Response time affected by the window "page résumé" at the bottom of the page

I had a major problem when listening to a score : there was a gap between the audible song and the part of the score pointed at at the moment. This recurrent pb was very perturbing when trying to sing according to what was shown on the screen.
By chance, I identified a "blinking" on the bottom part of the score according with the "décalage" in time on what I heard and what I saw pointed on the score being executed.
I modified the size of the bottom window (enlarge it) and the pb has been solved !!!
Nevertheless, I think that a bug is linking the response time when playing a score on MuseScore and the size of the bottom window.
I hope my explanation is understandable (I am french) and it will be solved very soon :)
Thanks o lot for solving this pb.