I think an indication for sliders that are way slower than the previous sliders would be good.For example:
if the slider is a lot slower than the slider bevore, the outline is red
and if it is an faster the outline is blue.
(right now the outline is always white)
(the more color it has the larger is the difference of speed)
if the slider is a lot slower than the slider bevore, the outline is red
and if it is an faster the outline is blue.
(right now the outline is always white)
(the more color it has the larger is the difference of speed)