Datasource load very slow when using Nanoflow in Datagrid2

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I have a datagrid2 to display some data. When I config the datasource to nanoflow (which call a microflow inside it. After the calling, a input focus action was set, this is why I use nanoflow as datasource), it become very slow to show these data, sometimes cost 1 minute more.  The data amount is about 60-70 without much associations, not very big. I put a log before and after the microflow calling in nanoflow, it takes 1 minute more. I also put a log inside microflow, it only takes 1second to finish. I doubt if this is due to the low network ? But other pages seem to work fine. When I change the datasouce to microflow (the same microflow in that nanoflow), it becomes very fast ( 1-3 seconds perhaps) , so I'm very confused why nanoflow cost so long to load the data? Any one who could provide some understanding on it, what is the difference between datasource microflow and nanoflow calling microflow?  Appreciate!
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