Optimize Performance in Power Query

[bboy0009]

Hi guys,

In Power Query , in a table , I have 2 or plus steps of rename separately. I wonder if I group them in one same step of rename, will I optimize the performance even if it's a little. Of course, they are independants of others steps of transformation. 

I would appreciate if there is some engineering explaination

Thank you in advance !

Have a nice weekend ! 

[JoaoMarcelino · Accepted solution]

Hi @bboy0009 !

Every time we run a query or update it, there is a bunch of operations that Power Query/vertipaq do "behind the scenes".

I have duplicated a query "product" to "product (2)".
In "product, we have 2 renames separately (rename 1 and rename 2 - 2 separate steps):

In product (2), I've put together the 2 renames in just one step "renamed column":

This means that power query did half of the category operations, therefore half of the "effort" to get to the same result.
You can try this yourself here:

Depending on the options you select to "diagnose", several new audit queries will appear:

Despite reducing operations to "half" there is the question of organization: we should, has best practice to have our steps in Power Query organized and reduced to the minimum number, which avoids further confusion and eases the maintenance time 🙂

Hope I was of assistance!
Cheers
Joao Marcelino
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