Why is the total duration for DAX query vastly different from what is shown under DAX Studio ?

[Anonymous]

@v-shex-msft

So I am new to optimizing Power BI , and what I learnt from online is to turn on the performance analyzer and look for DAX queries taking more than 120 ms to run.


Here, I have 67 visuals in one page , I ran the performance analyzer
sort it in DESC order of DAX query duration , and found 1st visual whose DAX query took 847 ms to run.

I copied it to DAX studio and there it ran for 64 ms.

What does this mean ? Is the DAX query already fast as it is and due to may small RAM of 4GB that 64ms takes 847ms ? Or do I need to do further optimization?

I also know that SE queries above 20 is an indicator that DAX query needs to be optimized, but this 12.

Any help would be greatful as I am completely new to Power BI Optimization.

[selimovd]

Hello @Anonymous ,

probably the query is cashed.

When you do the Query in DAX studio, always chose the "Clear Cache then Run" option:

This should give you a more realistic time of the query.

If you need any help please let me know.

If I answered your question I would be happy if you could mark my post as a solution ✔️ and give it a thumbs up 👍

Best regards

Denis

Blog: WhatTheFact.bi

[Anonymous]

Yes I have done this and still got this issue.

[bduong]

Same issue. Any explanations for this?