The fastest indicator setting you can select is to update on every tick. In other words it is updating when an actual trade occurs. The DOM on the other hand displays the current bid/ask values whether or not a trade has occurred. In slow moving markets the DOM can still move around quickly even though no trades occur. The chart indicator however only shows the bid/ask values when the last trade occurred. If no trade occurs for 20 seconds the chart won't update for 20 seconds! In the meantime the DOM values might have changed numerous times as traders pull or stack their limit orders. The "realtime depth" setting with this indicator is certainly not realtime.
With this particular indicator there appears to be a need for a true realtime setting.
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