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Helper II
Helper II

Power Query M: 1 query, twice referenced => data loading three times?!



I'm importing a folder of text files. The combined contents are stored in "F" file.

I then reference F two times and apply a different filter to each  with F1 and F2.


Now, when refreshing it seems that all three querying the source files, generating long loading times. Also the files are a couple of hundred MBs in size.


My guess would have been that only F reloads the data. F1 and F2 then near-instantaneously being up-to-date as well. But this does not seem to be the case.


Is this expected behaviour?


Kind regards








Solution Sage
Solution Sage

Hi @chefe,


To improve the performance of referencing table, you need to buffer your table. Like: Table.Buffer(YourTable). After adding the Table.Buffer, when your refresh your reference, it will not access the database again.


For more details, please refer:


Xi Jin.

Hello, does it work if the query has been made of table combined of 12 files of around 300 mega each?

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