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Alirezam
Helper V
Helper V

Extremely slow query when processing a query

‎05-18-2021 06:08 PM

Hi,

I am reading multiple folders and process some xml. files in the power query editor. After adding a 'column' to calculate something, it is now taking few hours to load the query and apply the new steps. It is weird that as shown below, it looks like it is reading a massive file with over 1 GB but my data source is not bigger than 200 MB. Any idea would be appreciated.

 

Capture.PNG

 

 

 

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mahoneypat
Microsoft Employee
Microsoft Employee

‎05-18-2021 06:12 PM

Please see this video and article.  You are going to want to use Table.Buffer to avoid reloading your source data repeatedly.

(5) Inside Power Query reference queries for Power BI and Excel - YouTube

Power Query M Primer (Part 12): Tables—Table Think I | Ben Gribaudo

 

Pat

 





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Alirezam
Helper V
Helper V
In response to mahoneypat

‎05-19-2021 05:16 PM

Thanks, it was helpful however did not solve my issue with slowness.

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