But you are using minute data... try it again using tick data like a volume or range chart.
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The problem is not backfill for minute data, which is good enough. The problem is real-time volume, which is not good enough. If I look at the OBV indicator above, it rises on one chart and shows a decline on the other one. If you want to use a delta volume indicator with IB realtime charts, it gets even worse.
And when you trade a 5 min chart, you do not want to backfill your chart every 5 minutes to get correct volume?
I could try a test with a volume chart. Tick / Range / Renko etc. charts will mess up.
The 5 min Chart is build with IB realtime data, so it represents the real-time volume. There is only a little difference, even in the OBV indicator.
On the 1min chart the OBV indicator starts at different level. ZF Backfill starts much higher than IB RT. I dont know why, but that could be the reason why the are out of sync.