Hildegarde

It’s because of the screen. Low frame rates are much less impactful on a small screen. When the screen takes up most of your field of view, you notice the frame rate more.

It’s not you, its the screen.

Pick one hand to play the note. Pick whichever one makes the most musical or technical sense. I would play it on the right hand so it’s easier to phrase the melody.

When the b is repeated, use the left hand because its accompaniment now. The pedal will give enough sustain.

What is the piece? Context is important for interpretation.