JSON UI sliders don't register mouse movement unless at a certain speed

JSON UI sliders don't register mouse movement unless at a certain speed.

How to reproduce:

1. Find a screen that contains a JSON UI slider
2. Click and drag the slider with your mouse slowly
3. Observe how the slider doesn't move
4. Click and drag the slider with your mouse at a faster speed
5. Observe how the slider moves

Observed results:
Unless moving at a faster speed, JSON UI sliders don't move along with the mouse

Expected results:
No matter the speed, the JSON UI sliders should move along with the mouse