Reproduction steps:

1. Open attached "scrollrect_repro" Unity project.
2. Open and play "ScrollRect-UnitysVersion" scene.
3. Press the 1-5 buttons on the keyboard to move the UI.

Actual behavior(GIF1):
* UI gets jittery when it slows down.

Expected behavior(GIF2):
* UI remains smooth when it slows down.
or
* There is a way to manipulate epsilon delta value.

Note:
* User suggestion is to change it from 0.01f to 0.0001f
https://bitbucket.org/Unity-Technologies/ui/src/0155c39e05ca5d7dcc97d9974256ef83bc122586/UnityEngine.UI/UI/Core/ScrollRect.cs?at=5.2&fileviewer=file-view-default#ScrollRect.cs-533