The tick volume is measured by how much the price is has ticked “up” or “down” in that particular candle bar. So the more people are getting in at the time, the longer the volume line will become. This is because there will be more movement in price action with all of those entry orders flying in. So it makes sense that the volume indicator is, first of all, very accurate, and second has no real lag to it. It is currently showing you what the price action is doing the number of “ticks” on that candle bar. This results in the bar looking like this:
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