ui_level nodes with animation option soft.
soft means that animation takes about 1 second to complete.
Seems to me (I cant run the flow) that the level nodes are updated simultaneously.
And the rate of the data input is 0.8 sec.
So there is zero or less time for dashboard to take a rest. (no time for smooth clean up procedures ...)
It is informed on ui_level info page also
This widget is not perfect choice to display high-frequent data changes like audio or similar. If you are using a lot of Level widgets on your dashboard and you are feeling performance loss, consider turning off animations of value text (if used) or turn off all animations.