are you referring to the "top" value ?
it is recalculated every 100 shifts.
but it takes 3000 shifts to remove a value from memory.
the point in keeping 3000 values in memory is that display resolutions up to 3000 in width are supported.
if you suddenly switch to 2560x1600 (highest resolution reported among visitors of rejetto.com
), then you will get a full width graph.
so, 3000/10Hz = 300 seconds = 5 minutes .... this is the time it should take.